string (10) "Error Stat" String (10) "Error Stat"

In fact, we have the legendary 4a motor with an increased block height and piston stroke, as a result of which the volume rose to 1.8 liters, the long-time engine design added beautiful craving on low revolutions.

Petrol atmospheric engine 7A-Fe.

Design features

The 7A FE engine has the following features of the design of nodes and mechanisms:

• 16 valves, 4 per cylinder;
• The camshafts are laid into the sliding bearings inside the GBC;
• Only one camshaft has a link with a belt;
• Inlet camshaft is activated from the graduation;
• To prevent the screen, the camshaft gear must be placed;
• V-shaped valve location;
• Long-terrestrial engine design;
• EFI injection;
• Gasket cylinder head metal
• Installation of different camshafts, depending on the vehicle in which the motor is worth;
• Not floating piston finger.

The actuator of the Motors of the A series A, in the photo it can be seen that rotation with crankshaft transmitted to the gear of the outlet camshaft, after which is transmitted to the inlet shaft

The design of the motor is simply and reliable, there are no phase students and adjustments of the geometry of the intake manifold, which is thought out by the Japanese the GRM drive, even when the belt is broken, does not heat the valve.

7A-FE service regulations

This engine Requires systematic maintenance within the specified time:

• Engine oil is recommended to change together with the filter every 10,000 mileage;
• Fuel and air filters are recommended to change after 20,000 km;
• Candles require attention and replacement to reach 30 thousand km;
• Adjustment of valve gaps is required every 30,000 mileage;
• The inspection of hoses and the discovery bubbles requires systematic monthly control;
• Graduation collector will require a replacement after 100,000 km;
• Replacing the timing belt is recommended every 100 thousand km, and its inspection every 10,000 km;
• Pomp serves about 100,000 km.

Overview of faults and ways to repair

By virtue of the structural features, the 7A-FE motor is subject to the following "diseases":

A knock inside the DVS	1) Wear a pair of friction piston 2) Violation of thermal valve gaps 3) wear of the cylindrophone group (the impact of the piston on the sleeve during the smoker)	1) replacement of fingers 2) adjustment of gaps
Improving the flow of oil	Fault piston rings Or oil dialing Caps	Replacing rings and caps
Motor starts and stalls	File related to fuel system or ignition	Replacement fuel filter, fuel pump, examination of the traver, checking the spark plugs
Floating revs	1) zamor nozzles, throttle valve, Valve RHX 2) insufficient pressure in the fuel system	1) cleaning nozzles, choke and valve RXX 2) Replacing the fuel pump or checking the fuel pressure regulator
Increased vibration	1) Zavo injectors, Ignition Candle Fault 2) Different compression in cylinders	1) Cleaning or replacing candles and nozzles 2) Diagnostics of compression, checking leaks

Problems with the launch of the engine and with idle stroke are associated with the development of the engine temperature sensors. Lambda probation breakage entails increased flow Fuel and as a result, reducing the scene resource. Motor overhaul can make it yourself with tools. The operating manual describes the entire list of possible actions with DVS.

List of car models in which 7a-Fe was installed:

Toyota Avensis

• Toyota Avensis
  (10.1997 — 12.2000)
  hatchback, 1 generation, T220;
• Toyota Avensis
  (10.1997 — 12.2000)
  Universal, 1 generation, T220;
• Toyota Avensis
  (10.1997 — 12.2000)
  Sedan, 1 generation, T22.

Toyota Caldina.

• Toyota Caldina.
  (01.2000 — 08.2002)
  restyling, wagon, 2 generation, T210;
• Toyota Caldina.
  (09.1997 — 12.1999)
  Universal, 2 generation, T210;
• Toyota Caldina.
  (01.1996 — 08.1997)
  restyling, wagon, 1 generation, T190.

Toyota Carina.

• Toyota Carina.
  (10.1997 — 11.2001)
  restyling, sedan, 7 generation, T210;
• Toyota Carina.
  (08.1996 — 07.1998)
  sedan, 7 generation, T210;
• Toyota Carina.
  (08.1994 — 07.1996)
  Restyling, sedan, 6 generation, T190.

Toyota Carina E.

• Toyota Carina E.
  (04.1996 — 11.1997)
  restyling, hatchback, 6 generation, T190;
• Toyota Carina E.
  (04.1996 — 11.1997)
  restyling, wagon, 6 generation, T190;
• Toyota Carina E.
  (04.1996 — 01.1998)
  restyling, sedan, 6 generation, T190;
• Toyota Carina E.
  (12.1992 — 01.1996)
  Universal, 6 generation, T190;
• Toyota Carina E.
  (04.1992 — 03.1996)
  Hatchback, 6 generation, T190;
• Toyota Carina E.
  (04.1992 — 03.1996)
  Sedan, 6 generation, T190.

Toyota Celica.

• Toyota Celica.
  (08.1996 — 06.1999)
  
• Toyota Celica.
  (08.1996 — 06.1999)
  restyling, coupe, 6 generation, T200;
• Toyota Celica.
  (10.1993 — 07.1996)
  coupe, 6 generation, T200;
• Toyota Celica.
  (10.1993 — 07.1996)
  Coupe, 6 generation, T200.

Toyota Corolla

Europe

• Toyota Corolla
  (01.1999 — 10.2001)
  Restyling, wagon, 8 generation, E110.

• Toyota Corolla
  (06.1995 — 08.1997)
  restyling, wagon, 7 generation, E100;
• Toyota Corolla
  (06.1995 — 08.1997)
  restyling, sedan, 7 generation, E100;
• Toyota Corolla
  (08.1992 — 07.1995)
  Universal, 7 generation, E100;
• Toyota Corolla
  (08.1992 — 07.1995)
  Sedan, 7 generation, E100.

Toyota Corolla Spacio.

• Toyota Corolla Spacio.
  (04.1999 — 04.2001)
  restyling, minivan, 1 generation, E110;
• Toyota Corolla Spacio.
  (01.1997 — 03.1999)
  Minivan, 1 generation, E110.

Toyota Corona Premio.

• Toyota Corona Premio.
  (12.1997 — 11.2001)
  restyling, sedan, 1 generation, T210;
• Toyota Corona Premio.
  (01.1996 — 11.1997)
  Sedan, 1 generation, T210.

Toyota Sprinter Carib

• Toyota Sprinter Carib
  (04.1997 — 08.2002)
  Restyling, wagon, 3 generation, E110.

Motor tuning options

The 7A-FE engine is not designed for tuning, but the craftsmen put on the block 7a head from the 4a-GE engine and it turns out 7a-ge, but to put a little head, you still need to make a selection of pistons, tuning the fuel-air mixture, and the Tuka ECU does not allow a thin setting .

However, an atmospheric tuning is possible in the following way:

• Increasing the degree of compression due to the GBC;
• Modernization of the GBC, an increase in the diameter of the valves and the saddle;
• Replacing the fuel pump and camshafts;
• Installing the head of the cylinder block from Motor 4a Ge.

You can also make SWAP motor. Purchase a contract engine will not be difficult, the choice is huge: 3S-GE, 3S-GTE, 4A-GE, 4A-GZE. It is recommended to buy motors with mileage no more than 100 thousand km. And carefully check their condition before buying.

The list of modifications of the DVS

The 2A FE modifications were about 6, they differed in power, torque and work in different modes. So done because the engines were installed on different cars, different masses and sizes. Therefore, on some cars there were few native 105 hp And Toyota engineers had to boost cars using the camshafts and brain programs of the engine:

• Maximum torque, n * m (kg * m) at rpm:
  • 150 (15) / 2600;
  • 150 (15) / 2800;
  • 155 (16) / 2800;
  • 155 (16) / 4800;
  • 156 (16) / 2800;
  • 157 (16) / 4400;
  • 159 (16) / 2800;
• Maximum power, horse power: 103-120.

Specifications 7A-FE 105-120 hp

The engine consists of the simplest cast-iron block and the aluminum head, between them, the grinding of the metal bottle, the GDM drive is carried out with a belt. The two-camshaft layout of the head made it possible to implement the GRM mechanism without the use of rocker. When the belt is cut, the motor does not oppress the valve, such motors are called skimming.

The technical characteristics of the 7A FE engine correspond to the following tabular values:

Engine volume, ccmm	1762
Maximum power, hp	103-120
Maximum torque, N * M (kg * m) for rpm. / Min.	150 (15) / 2600
Used fuel	Gasoline AI 92-95
Fuel consumption, l / 100 km	Claimed: 4,6-10. Real: 8-15
engine's type	4-cylinder, 16-valve, DOHC
Cylinder diameter, mm	81
Piston stroke, mm	85,5
Compression, atm	10-13
Engine weight, kg	109
Ignition system	Draver, individual coil
What oil pour into a viscosity engine	5W30
Which oil is better for the engine by manufacturer	Toyota.
Oil for 7A-Fe in composition	Synthetics semi-synthetic mineral
Motor oil volume	3 - 4 l depending on the car
Working temperature	95 °
RF resource	announced 300,000 km real 350000 km
Adjustment of valves	washers
Intake manifold	Aluminum
Cooling system	forced, antifreeze
Volume of oh	5.4 L.
water pump	GMB GWT-78A 16110-15070, AISIN WPT-018
Candles on 7a-Fe	BCPR5EY NGK, CHAMPION RC12YC, BOSCH FR8DC
Candle clearance	0.85 mm
Timing belt	Belt Timing 13568-19046.
The order of the cylinders	1-3-4-2
Air filter	MANN C311011
Oil filter	VIC-110, MANN W683
Flywheel	6 bolt mount
Fastening bolts flywheel	M12x1.25 mm, Length 26 mm
Valve stem seals	Toyota 90913-02090 intake Toyota 90913-02088 prom

Thus, the 7a-Fe engine is a benchmark of Japanese reliability and unpretentiousness, it does not oppress the valve, and its power reaches 120 horsepower. This engine is not intended for tuning, so increase the power will be quite difficult and the forcing will not bring a significant result, but it is beautiful in everyday use and in systematic services will not bring hassle to its owner.

If you have any questions - leave them in the comments under the article. We or our visitors will gladly respond to them

Engine Toyota 7A-Fe 1.8 l.

Engine Characteristics Toyota 7A

Production	Kamigo Plant. Shimoyama Plant. Deeside Engine Plant. North Plant. Tianjin Faw Toyota Engine's Plant No. one
Engine brand	Toyota 7A.
Years of release	1990-2002
Cylinder block material	cast iron
Supply system	injector
A type	in line
Number of cylinders	4
Valves on cylinder	4
Piston stroke, mm	85.5
Cylinder diameter, mm	81
Compression ratio	9.5
Engine volume, ccmm	1762
Engine Power, L.S. / Ob. Min	105/5200 110/5600 115/5600 120/6000
Torque, Nm / Ob.min	159/2800 156/2800 149/2800 157/4400
Fuel	92
Environmental norms	—
Engine weight, kg	—
Fuel consumption, l / 100 km (for Corona T210) - city - Rouss - Mixed.	7.2 4.2 5.3
Oil consumption, gr. / 1000 km	up to 1000.
Engine oil	5W-30 10W-30. 15W-40 20W-50
How much engine oil	3.7
Replacing the oil is carried out, km	10000 (better than 5000)
Engine operating temperature, hail.	—
Engine resource, thousand km - According to the plant - on practice	N.D. 300+
Tuning - Potential - without loss of resource	N.D. N.D.
The engine was installed	Toyota Corolla Spacio. Toyota Sprinter Carib Geo Prizm.

Motor malfunction and repair 7a-Fe

The Toyota 7A engine is another variation on the basis of the main 4A motor, in which the short-proof crankshaft (77 mm) was replaced with the knee of 85.5 mm, respectively, the height of the cylinder block increased. Otherwise the same 4a-Fe.
Only one version of this engine was produced, it was 7A-Fe, depending on the setting, it was issued from 105 hp. up to 120 hp Weak version of 7a-Fe Lean Burn, it is not recommended to take, the system is a capricious and pretty road in service. Otherwise, the engine is similar to 4A and its diseases are the same: problems with a rubber, with sensors, a knock of piston fingers, a knock of valves that all forget to regulate on time and so on, full list trouble.
In 1998, to change 7a-Fe, came new engine , About him a separate mention.

Toyota 7A-Fe Engine Tuning

Chip tuning. Atmo

In the atmospheric version, as with, nothing sensible from the motor will not come out, you can crush the whole engine, to replace everything that changes, but it is completely meaningless. Some rationality has only turbocharging.

Turbine on 7a-Fe

You can put the turbine to the standard piston and blow up to 0.5 bar without problems, we need only suitable whale, or cook and collect it yourself. In addition to the turbine, you will need 360ss nozzles, Valbro 255 pump, exhaust on 51 pipes and setting up on abita or January 7.2, it will ride it, but not too long.

Toyotovsky power units of the series "A" were one of the best developments that companies allowed to get out of the crisis in the 90s of the last century. The largest volume was Motor 7A.

One should not be confused 7a and engine 7K. No related relationship these power aggregates do not have. DVS 7K was produced from 1983 to 1998 and had 8 valves. Historically, the "K" series began its existence in 1966, and the series "A" in the 70s. Unlike 7K, the engine series A developed as a separate direction of development 16 valve motors.

Engine 7 A has become a continuation of the improvement of 1600 cubic motor 4a-Fe and its modifications. The volume of the engine grew up to 1800 cm3, the power and torque increased, which reached 110 hp. and 156nm, respectively. The 7A FE engine was produced at the main production of Toyota Corporation from 1993 to 2002. The power units of the series "A" are still produced in some enterprises using licensed contracts.

Constructive force aggregate Made according to the rancinal four-fourth chart with two upper distributive trealsAccordingly, the camshafts manage the operation of 16 valves. The fuel system is made of injector with electronically control and rubbed ignition distribution. Driver timber belt. When the valve belt is cut, it is not bent. The head of the block is made in the same way as the head of the 4A series engine block.

Official options for the improvement and development of the power unit are not. Supplied with a single number-letter 7A-FE index for configuration different cars Up until 2002. The successor of the 1800 cubic drive appeared in 1998 and had 1zz index.

Constructive modifications

The engine received a block with an increased vertical size, the changed crankshaft, the head of the cylinders, increased the course of the pistons while maintaining the diameter.

The uniqueness of the design of the engine 7a is to use a two-layer metal laying of the block head and a two-circuit crankcase. The upper part of the crankcase, which was performed from the aluminum alloy, was attached to the block and the gearbox body.

The lower part of the crankcase was made of steel sheet, and allowed it to dismantle it, without removing the engine. Motor 7A has improved pistons. In the groove of the oil surcharge ring, 8 holes for draining oil in the crankcase are made.

The upper part of the fastener cylinder block is made in the same way. 4a-Fe is allowed to use the head of the cylinder block from a smaller motor. On the other hand, the blocks of the blocks are not entirely identical, since the diameters of the intake valves with 30.0 were changed on the 7 A series, and the diameter of the outlet valves is left unchanged.

In this case, other camshafts provide greater opening of intake and exhaust valves of 7.6 mm versus 6.6 mm per 1600 cubic engine.

Changes were made to the design of the exhaust manifold to attach WU-TWC converter.

Since 1993, the fuel injection system has changed on the engine. Instead of simultaneous injection into all cylinders, a pairwise injection began to apply. Changes were made to the settings of the gas distribution mechanism. Changed the opening phase of the outlet valves and the closing phase of intake and exhaust valves. What made it possible to increase power and reduce fuel consumption.

Until 1993, the engine starting system was used on the engines, which was used on the 4a series, but then, after finalizing the cooling system, refused to be refused. The engine control unit is left as the same, with the exception of two additional options: the ability to test the system operation and control over the detonation, which were added to the ECM for an 1800 cubic engine.

Specifications and reliability

7a-Fe characteristics have met different. Motor had 4 versions. As a basic configuration, a motor capacity of 115 hp was produced. and 149 nm torque. The most powerful version of the DVS was produced for Russian and Indonesian markets.

She had 120 hp and 157 nm. For the American market, the "clamped" version was also produced, which was given only 110 hp, but with an increased to 156 nm torque. The weakest version of the engine squeezed 105 hp, as well as the 1.6 liter motor.

Part of the engines has the designation 7a Fe Lean Burn or 7a-Fe LB. This means that the engine is equipped with a depleted mixture combustion system, which first appeared on Toyota engines in 1984 and hidden under the T-LCS abbreviation.

Linben technology allowed to reduce fuel consumption by 3-4% when driving around the city and just over 10% when driving on the highway. But this, the system reduced the maximum power and torque, therefore evaluating the effectiveness of the use of this constructive refinement.

Engines equipped with LB, mounted on Toyota Karina, Caldina, Corona and Avensis. Corolla cars have never been completed with engines with such a fuel economy system.

In general, the force aggregate is quite reliable and not soared in operation. Resource to first overhaul Superior 300,000 km run. During operation, attention must be paid electronic devicesserving engines.

The overall picture spoils the Linburn system, which is very arrogant to the quality of gasoline and has an increased cost of operation - for example, requires an ignition candle with platinum inserts.

Major faults

The main malfunctions of the engine operation are associated with the functioning of the ignition system. The splitting system of the spark is implied by wear of the bearings of the traver and gear gear. As wear is accumulated, it is possible to shift the moment of the spark that entails or to the ignition pass or to the loss of power.

Very demanding to clean high voltage wires. The presence of contaminants causes a sample of sparks on the outer part of the wire, which also leads to engine troop. Another cause of trimming is the wear or pollution of the spark plugs.

Moreover, the system is affected by the system and the NAGA, which is formed when using waterproof or iron-sulfur fuel, and the external contamination of the surfaces of the candles, which leads to a breakdown on the cylinder head housing.

The fault is eliminated by replacing candles and high-voltage wires included.

As a malfunction, engines equipped with the LEANBURN system are often recorded, in the 3000 rpm area. The fault occurs because there is no spark in one of the cylinders. Caused by usually wear platinum.

With a new high-voltage set, cleaning may require fuel system To eliminate contamination and restoring the injectors. If it does not help, then the malfunction can be found in the Esud block, which may require flashing or replacement.

The engine knock is due to the operation of the valves requiring periodic adjustment. (No less often 90,000 km). The piston fingers in the engines 7a are pressed, so the additional knock on this engine element is extremely rarely fixed.

Elevated oil consumption is laid constructively. The technical passport of the engine 7A FE indicates the possibility of natural flow to operate to 1 l of engine oil per 1000 km of mileage.

That and technical fluids

As recommended fuel, the manufacturer's plant indicates gasoline with an octane number of not lower than 92. The technological difference should be taken into account in determining the octane number of Japanese standards and the requirements of the GOST. It is possible to use non-determined 95 fuel.

Motor oil is selected by viscosity in accordance with the operating mode of the car and the climatic features of the region of operation. Most fully overlaps all possible conditions synthetic oil SAE 5W50 viscosity, however, for everyday average exploitation, there is enough viscosity oil 5W30 or 5W40.

For a more accurate definition, refer to the instruction manual. Capacity of the oil system is 3.7 liters. When replacing a filter change on the walls of the internal channels of the engine, up to 300 ml of lubricant can remain.

Engine maintenance is recommended to produce every 10,000 km of run. In case of severe operation, or using a car in highland, as well as at more than 50 engine launches at temperatures below -15С, it is recommended to reduce the service period by half.

The air filter changes as of state, but at least 30,000 km of mileage. The timing belt requires replacement regardless of its state every 90,000 km of run.

NB. When passing, it may require a reconciliation of a series of engine. The engine number must be located on a platform located in the rear of the engine under the outlet at the generator level. Access to this area is possible with a mirror.

Tuning and engine refinement 7A

The fact that the internal combustion engine was originally designed based on the 4a series, allows you to use a block of a block from a smaller engine and modify the 7A-FE motor up to 7a-GE. Such a replacement will give an increase of 20 horses. When performing such a finalization, it is also desirable to replace the original oil pump on the unit from 4A-GE, which has greater performance.

Turbization of the 7A series engines is allowed, but leads to a decrease in the resource. Special crankshafts and inserts for chance are not produced.

Reliable japanese engines

04.04.2008

The most common and today is the most widely repaired from Japanese engines is the Toyota Engine Series 4, 5, 7 A - Fe. Even a novice mechanic, the diagnostics know about possible problems engines in this series.

I will try to highlight (assemble in a single integer) the problems of these engines. They are a bit, but they deliver a lot of trouble to their owners.

Date from the scanner:

On the scanner you can see a short, but a capacitive date consisting of 16 parameters for which you can really appreciate the operation of the main engine sensors.
Sensors:

Oxygen sensor - lambda probe

Many owners are drawn to the diagnosis due to increased fuel consumption. One of the reasons is a banal intro heater in the oxygen sensor. The error is fixed by the code control unit number 21.

The inspection of the heater can be carried out by a conventional tester on the sensor contacts (R-14 Ohm)

Fuel consumption increases due to lack of correction when warming up. You will not be able to restore the heater - only replacement will help. The cost of the new sensor is large, and the b \\ y does not make sense (the resource of their developments is great, so this is a lottery). In such a situation, as an alternative, less reliable universal NTK sensors can be installed.

The term of their work is small, and the quality leaves much to be desired, therefore such a replacement of the temporary measure, and it should be made with caution.

With a decrease in the sensitivity of the sensor, an increase in fuel consumption (by 1-3l). The performance of the sensor is checked by an oscilloscope on the block diagnostic connectoror directly on the sensor's chip (switching number).

temperature sensor

If the owner's sensor is incorrect operation, there is a lot of problems. When the sensor measuring element is cut, the control unit replaces the sensor readings and fixes its value of 80 degrees and fixes the error 22. The engine, with such a malfunction, will work in normal mode, but only until the engine is heated. As soon as the engine cools, run it is problematic without doping, due to the small opening of the injectors.

There are cases when the resistance of the sensor is chaotically changed when the engine is running on H.H. - The turnovers will swim.

This defect is easy to fix on the scanner, watching the temperature indication. On the heated engine, it should be stable and not changed chaotic values \u200b\u200bfrom 20 to 100 degrees.

With this sensor defect, "black exhaust" is possible, unstable work on H.H. And, as a result, increased consumption, as well as the impossibility of running "to hot". Only after 10 minutes of sludge. If there is no complete confidence in the proper operation of the sensor, its readings can be replaced by turning on its chain with a variable resistor 1c, or permanent 300, for further verification. By changing the sensor readings, the change in revolutions is easily controlled at different temperatures.

Throttle position sensor

Many cars undergoing a disassembly assembly procedure. These are the so-called "designers". When removing the engine in the field and the subsequent assembly, sensors suffer to which the engine often lean. When the TPS sensor faults, the engine stops normally throttling. The engine when the rotation set is chopped up. The machine switches incorrectly. An error 41 is fixed by the control unit. When replacing a new sensor, you must configure that the control unit correctly seen a sign of H.H., with a fully released gas pedal (closed throttle). In the absence of a sign of idling, adequate regulation of H.H. will not be carried out. And there will be no mode of forced idling when braking the engine, which will again entail an increased fuel consumption. On the 4A engines, the 7a sensor does not require adjustment, it is installed without the possibility of rotation.
Throttle Position ...... 0%
Idle Signal .................. .on

Absolute Pressure Sensor Map

This sensor is the most reliable, from all installed on japanese cars. The reliability is simply striking. But and his share has a lot of problems, mainly due to improper assembly.

He is either broken down by the "nipple", and then seal with glue any passage of air, or the tightness of the supply tube is disturbed.

With this break, the fuel consumption increases, the level of CO in exhaust up to 3% increases. Very easy to observe the operation of the sensor on the scanner. The INTAKE Manifold line shows the discharge in the intake manifold, which is measured by the Mar sensor. When the entry wiring, the ECU registers the error 31. At the same time, the opening time of the injectors up to 3.5-5ms is sharply incremented And engine stop.

Knock sensor

The sensor is set to register detonation stuffs (explosions) and indirectly serves as a "corrector" of the ignition advance angle. The registering element of the sensor is Punoplastin. If the sensor malfunction, or the wiring break, on the passages over 3.5-4 tons. ECU turns fixes the error 52. It becomes intimidating when acceleration.

You can check the performance by an oscilloscope, or, measuring, resistance between the sensor output and the housing (if there is resistance, the sensor requires replacement).

Crankshaft sensor

On the 7a series engines set the crankshaft sensor. An ordinary inductive sensor is similar to the ABC sensor, and practically sureless in operation. But confusions happen. With interstitious closure inside the winding, a disruption of the generation of pulses on certain revolutions occurs. This is manifested as a limit of engine speed in the range of 3.5-4 tons. Revolutions. A peculiar cut-off, only on low revs. Detect the intersensile closure is quite difficult. The oscilloscope does not show a decrease in the amplitude of the pulses or the frequency change (during acceleration), and the tester notice the changes in the shares of Ohm is quite difficult. If the symptoms occur the revolutions limit on 3-4 thousand, simply replace the sensor on knowingly serviceable. In addition, a lot of trouble gives damage to the target crown, which damage the negligent mechanics, producing work on replacing front kettle crankshaft or timing belt. To break the trunk of the crown, and restoring them with welding, it seems only the visible absence of damage.

The crankshaft position sensor ceases to adequately read the information, the ignition advance angle begins to change chaotically, which leads to loss of power, unstable work Engine and increase fuel consumption

Injectors (nozzles)

With many years of operation, the nozzles and needles of the injectors are coated with resins and gasoline dust. All this naturally disrupts the correct spray and reduces the performance of the nozzle. With severe contamination, there is a tangible engine shaking, fuel consumption increases. Determine the accuracy really, by conducting gas analyzes, according to the testimony of oxygen in the exhaust, one can judge the correctness of the pouring. The testimony over one percent will indicate the need for washing injectors (when proper installation Timing and normal fuel pressure).

Either by installing the injectors to the stand, and checking the performance in tests. The nozzles are easy to wash the laurel, Vince, both on installations for non-bleaching, and in ultrasound.

Idling valve, IACV

The valve is responsible for engine speed in all modes (heating, idling, Load). During operation of the valve petal, the stem is contaminated and occurs. Turns hang on warming up either on H.H. (due to the wedge). Tests for changing revolutions in scanners during the diagnosis of this motor is not provided. You can estimate the performance of the valve by changing the temperature sensor readings. Enter the engine to "Cold" mode. Or, removing the winding from the valve, to twist over the valve magnet. Singing and wedge will be tangible immediately. If it is impossible to dismantle the valve winding (for example, on the GE series), it is possible to check its performance by connecting to one of the control outputs and measuring the diversity of the pulses at the same time controlling the turns of H.Kh. and changing the load on the engine. On a fully heated engine, the unit is approximately 40%, changing the load (including electrical consumers), you can estimate an adequate increase in revolutions in response to a change in duty. With a mechanical valve jamming, a smooth extension of the duty is occurring, not entailing the change in the revolutions of H.H.

You can restore the work. Cleaning the Nagar and the dirt of the carburetor cleaner when the winding is removed.

Further adjustment of the valve is to install H.Kh. On a fully heated engine, rotating winding on the mounting bolts, achieve table revs for this type car (on the tag on the hood). After setting the E1-TE1 jumper into the diagnostic shoe. On more "young" engines 4a, 7a valve has been changed. Instead of the familiar two windings in the body of the valve winding, installed a chip. Changed the nutrition of the valve and the color of the winding plastic (black). It is noiencies to measure the resistance of windings on the conclusions.

The valve is supplied and the control signal of the rectangular shape of the variable duty.

For the impossibility of removing the winding, a non-standard fastener was installed. But the problem of the wedge remained. Now, if you clean the usual cleaner, the lubricant is washed out of the bearings (the further result is predictable, the same wedge, but already due to the bearing). It is necessary to completely dismantle the valve from the throttle block and then wash the rod with petal carefully.

Ignition system. Candles.

A very large percentage of cars comes to service with problems in the ignition system. When operating on low-quality gasoline, the ignition candles suffer primarily. They are covered with a red raid (ferry). There will be no qualitative sparking with such candles. The engine will work with interruptions, with skipping, increases fuel consumption, the level of CO in the exhaust increases. Sandblasts are unable to clean such candles. Only chemistry will help (a couple of hours) or replacement. Another problem increases the gap (simple wear).

Drying rubber tips of high-voltage wires, water that fell when washing the motor, which all this provoke the formation of a conductive path on rubber tips.

Because of them, sparking will not be inside the cylinder, and outside it.
When smooth throttling, the engine works stably, and with a sharp - "crusher".

With this position it is necessary to replace both the candles and wires. But sometimes (in field conditions) If the replacement is impossible, you can solve the problem with a conventional knife and a piece of sandy stone (shallow fraction). I cut a knife with a conductive path in the wire, and with a stone remove the strip from the candle ceramics.

It should be noted that it is impossible to remove the rubber band from the wire, this will lead to the complete inoperability of the cylinder.

Another problem is related to the wrong procedure for replacing candles. Wires with power are pulling out of the wells, pulling the metal tip of the occasion.

With such a wire, ignition skips and floating turns are observed. When diagnosing the ignition system, you should always check the ignition coil on the high-voltage discharge. The simplest check - on the engine running engine, see the spark on the discharge.

If the spark disappears or becomes a filamental - this indicates an intersless closure in the coil or on the problem in high voltage wires. Cutting the wires check the test tester. Small wire 2-3k, further to an increase long 10-12.

The resistance of the closed coil can also be checked by the tester. The resistance of the secondary winding of the coil bit will be less than 12.
Next generation coils are not suffering such a few (4a.7a), their refusal is minimal. Proper cooling and wire thickness excluded this problem.
Another problem is the current seal in the distributor. Oil, falling on the sensors, corrosive insulation. And when exposed to high voltage, the slider is oxidized (covered with a green bloom). Corner zaks. All this leads to the breakdown of spar formation.

In motion there are chaotic shootings (in intake manifold, in the muffler) and crushing.

" Thin " Fault engine Toyota

On the modern engines Toyota 4a, 7a Japanese changed the firmware of the control unit (apparently for more quick warm warming engine). The change lies in the fact that the engine reaches the turns of H.X.This at a temperature of 85 degrees. Also changed the design of the engine cooling system. Now the small circle of cooling intensively passes through the block of the block (not through the nozzle behind the engine, as before). Of course, the cooling of the head became more effective, the engine in general became more efficient. But in winter, with this cooling, when moving, the temperature of the engine reaches a temperature of 75-80 degrees. And as a result, permanent warming turns (1100-1300), increased fuel consumption and nerve owners. You can fight this problem, or the engine is stronger than the engine, or by changing the resistance of the temperature sensor (deceiving the ECU).

Butter

Owners pour oil into the engine without special disclaimwithout thinking about the consequences. Few people understand that various types of oils are not compatible and for mixing form an insoluble porridge (coke), which leads to the complete destruction of the engine.

All of this plasticine cannot be washed into chemistry, it is cleaned only by mechanical way. It should be understood if the old oil is unknown, it should be used before changing. And another advice to the owners. Pay attention to the color of the oily probe handle. It yellow color. If the color of the oil in your engine is darker color handles - it's time to replace, and not wait for the virtual mileage recommended by the manufacturer of the engine oil.

Air filter

The most inexpensive and easily accessible element is an air filter. Owners very often forget about his replacement, without thinking about the likely increase in fuel consumption. Often because clogged filter The combustion chamber is very polluted with oil burnt sediments, valve, candles are strongly polluted.

Diagnosis can be mistakenly assumed that all wines siloslets Kolpacchkov, But the root cause is a scored air filter, which increases with dirt discharge in the intake manifold. Of course, in this case, the caps will also have to change.

Some owners do not even notice about accommodation in the building air filter garage rodents. What speaks of their complete emptying to the car.

Fuel filteralso deserves attention. If it does not replace it in time (15-20 thousand run) the pump begins to work with overload, pressure drops, and as a result, the need to replace the pump.

Plastic impeller pump parts and check valve are prematurely wearing.

Pressure drops

It should be noted that the operation of the motor is possible at a pressure of up to 1.5 kg (with a standard 2.4-2.7 kg). Upon reduced pressure, there are permanent strips in the intake manifold Running problem (in terms of). The thrust is noticeably reduced. The pressure test is properly produced. (Access to the filter is not difficult). In the field, you can use the "pouring test from the return". If during the operation of the engine in 30 seconds from the gasoline, the gasoline is less than one liter flows, one can judge reduced pressure. It is possible for indirect determination of the pump performance to use an ammeter. If the current consumed by the pump is less than 4amper, then the pressure is seized.

You can measure the current on the diagnostic shoe.

When using the modern tool, the filter replacement process takes no more than half an hour. Previously, it took a lot of time. Mechanics always hoped in case they were lucky and the lower nozzle did not fit. But often it happened.

I had to break my head with a long way to hook a rolling nut of the lower fitting. And sometimes the filter replacement process turned into a "film" with the removal of the tube applying to the filter.

Today, no one is afraid of this replacement.

Control block

Until 1998 release, Control blocks did not have enough serious problems when operating.

Repairing blocks only due to" tough cakes" . It is important to note that all conclusions of the control unit are signed. Easy to find the required sensor output on the board to check, either wire transversals. Details are reliable and stable at low temperatures.
In conclusion, I would like to stop a little on gas distribution. Many owners "with hands" procedure for replacing the belt are performed independently (although it is not correct, they cannot properly tighten the crankshaft pulley). Mechanics produce a high-quality substitution for two hours (maximum) when the valve belt breaks are not found with the piston and the fatal destruction of the engine does not occur. Everything is designed to smallest things.

We tried to tell about the most frequent problems on Toyota Engine engines. The engine is very simple and reliable and subject to very tight operation on "water-iron gasolines" and dusty roads to our great and mighty homeland and the "Avosny" mentality of the owners. All mockery, he still continues to delight his reliable and stable workBy won the status of the best Japanese engine.

All the speedy identification of problems and light repair of the Toyota 4, 5, 7 A - Fe!

Vladimir Becrenev, Khabarovsk
Andrei Fedorov, Novosibirsk
© Legion Autodata

Union of automotive diagnostites

Information on maintenance and repair of cars you will find in the book (books):

I will express IMHO.

On the windscarette plate, I specified the recommended class of oil on the API, i.e. Not recommended the use of oil class below. Above it is possible. If SJ is written (for me), then you can pour oil classes SJ, SL, SM. This classification characterizes qualitative characteristic oil, its resistance, purity, viscosity, fluidity, detergent and antioxidant properties. These characteristics affect the health and durability of the engine, its purity.

No other restrictions makes a manufacturer.

The first parameter is to start a cold engine at a street temperature (the lower the value, the more in the stronger frost, the oil will save its viscosity characteristics and allow you to start the engine).

The second - shows the degree of preservation of the density during heating, with the mode of operation of the engine, which is often characteristic of it.

From this we conclude that in the averaged conditions:

The first digit of the index 5 (for winter) and 10 (for summer) is quite suitable for our conditions, if in the winter it is very cold, then we use 0. There is nothing bad if you will use 5 or 0 - the engine warms up and this parameter nothing means nothing. But if in the winter to use 10, 15 or even 20 - then the engine will simply not start, and if they start, the first minutes of the engine on the frozen oil will be a serious oil starvation caused by its low pumpability.

The second digit is a heated engine. If you are not a racer, the engine is not spinning to red, they do not greatly exceed the speed, and live in Africa, then 30 is fully justified. If a working temperature The engine is usually enhanced - like to drive, dive, on the track are driven "sneakers to the floor", the street temperature is constantly kept above 30-35s, or last winter you changed the thermostat to "hot" - it makes sense to pour oil with a higher index 40 , 50, 60 (depending on the degree and number of coincidence of the listed categories).

It is also impossible to forget that if the engine "eats" the oil is the increase in the second index, you will reduce its appetite.

But here you also need to be friends with your head. For example, in the Z series engines, the timing chain drive is lubricated motor Oil, and for normal lubricant, the manufacturer recommends the thickness of oil 20 or 30 (the second index), it is quite obvious that with a larger oil of the oil in the standard engine modes, the chain can not be blurred.

In general, the choice of oil remains behind the motorist, there are only recommendations from which it is possible to move, but to do it with the mind and consciously. IMHO.)))))))))))))))