Repair of car EFI engine, skillfully repair the fault of EFI car engine?

Petrol or diesel engine for EFI?

What to repair? Trouble details.

Common faults in car engines are:

1. At various speeds, the muffler emits a rhythmic "sudden" guesser sound and a slight black smoke;

2. The speed cannot be raised to high speed, and the power of the car is obviously insufficient;

3. The engine is not easy to start; It is not easy to speed up (stuffy) after starting, the car is weak to drive, when accelerating sharply, the carburetor is sometimes tempered, the ear stool potato and even the engine is easy to stall, and the engine temperature is high;

4. The engine accelerates slowly under idle conditions, but when accelerating sharply, the engine speed cannot be increased, and sometimes the carburetor is tempered;

5. The engine temperature is normal, and it works well at low, medium and high speeds, and after relaxing the accelerator pedal, the speed is too high or the idle speed is unstable or even stalled;

6. The steering wheel trembles at high speed;

7. Deviation when driving.

A "collapse engine" is a machine that can convert other forms of energy into mechanical energy, such as internal combustion engines (gasoline engines, etc.), external combustion engines (Stirling engines, steam engines, etc.), electric motors, etc.

What should I do if the EFI engine fails? Next, let's take a look at what to do if there are three major failures in the EFI engine.

1.The steering column cannot be pulled out of the p-position.

The AL4 automatic transmission will not be able to pull the drive lever out of P gear. At this time, the driver will be annoyed because the car can't move, because the other gears can't be engaged.

Of course, it is useless to drive the joystick with a hard hand plate. There is an ingenious way to pull the lever: how to extend the service life of the engine valve train, modify the engine turbo intake system.

a, the input and output end of the brake light switch is short-circuited;

b.Insert the large screwdriver diagonally into the lock to pull out the electromagnet, and quickly pull out the lever;

c.Open the ** glove box, directly pull up the drill core of the locking drive, and pull the gear lever to the "n" position.

Of course, there is a prerequisite for eliminating this fault, that is, the brake light will only turn on after pressing the brake pedal. If the "spt" and "*" lights on the dashboard are flashing, it may be that the automatic transmission's computer is damaged or the starter relay is damaged. At this point, the gear lever cannot be pulled out by the above method.

2.Ways to eliminate air locks.

The oil supply system of the electric spray truck can also be airlocked. In addition to the design reasons, the oil tank and oil pipe are close to the high temperature area, which is easy to air lock and needs to be removed by the traditional cooling method of cold water and cold rags. Other EFI trucks also have airlocks.

For example, the Beverly EFI suddenly stopped running and could not be started again.

At this time, you should turn on the switch, activate it a few times, and use the oil pool to draw oil from the disassembled automatic filter nozzle until the foamy gasoline is discharged and the oil line can be tightened. At the same time, it will tell you not to press the white button at the mouth of the fuel tank when refueling, so that the tank is full of oil and the gas in the tank will not be emptied. This malfunction is most likely to occur in a taxi with a full tank of fuel.

3.The method of preventing water ingress into the cylinder is justified.

Beverly Cars run fast in heavy rains and are prone to water immersion in the tank. The reason is that the suction port is located in the lower front part of the tank mask, and the splashed muddy water is easy to be sucked into the cylinder through the empty filter from the suction inlet, causing the cylinder to soak in water and damage the cylinder body. At the same time, when there is a sandstorm in the north, due to this structural feature of Beverly Cars, the dust is easy to enter the empty filter from the air intake, causing blockage and stalling.

Emergency measures: In sandstorm weather, Qin Ying cleared the empty dust of the filter element and turned the air inlet to the side, which was very effective. On heavy rainy days, control the speed of the vehicle, choose the road surface, and do not wash puddles and pools.

If the rainstorm lasts for a long time, you only need to temporarily remove the sliding straw at one end of the empty filter and install it after the weather improves, which can effectively avoid the occurrence of flooding and cylinder collision accidents.

Millions of car purchase subsidies.

Methods for diagnosing EFI engine failures:

1. Although the ECU (electronic control unit) of the engine is very reliable and will not cause problems easily, it will inevitably cause one or another failure for those old cars with a long service life (mileage of more than 150,000km, especially those with poor use conditions);

2. If an integrated block is damaged, the ECU fixed foot bolt is loose, the welding leg joint of an electronic component is welded, and the resistance and capacitor components fail, etc., it may cause the engine to start difficult, the control speed is unstable, the fuel consumption increases, the power is poor, the emission deteriorates and other bad consequences;

3. When these faults occur, they should be sent to the special maintenance department for inspection and repair in accordance with regulations; When there is no condition, the method of replacement comparison can be used to verify, that is, the corresponding intact components and devices on the same model of car can be borrowed, and the effect can be compared after replacement to determine the cause of the failure.

1. Although the ECU (electronic control unit) of the engine is very reliable and will not cause problems easily, it will inevitably cause one or another failure for those old cars with a long service life (mileage of more than 15000OKM, especially those with poor use conditions).

For example, if an integrated block is damaged, the ECU fixed foot bolt is loose, the welding leg joint of an electronic component is opened, and the resistor and capacitor components fail, etc., it may cause engine starting difficulties, unstable idling, increased fuel consumption, poor power, emission deterioration and other evil consequences.

When these faults occur, they should be sent to the special maintenance department to detect and repair, and when there are no conditions, the method of replacement comparison can be used to verify, that is, to borrow the corresponding intact components on the same model of car, and compare the effect after replacement to determine the cause of the failure.

2. The connection of the connector is faulty. There are many plug-in parts in the circuit of the electronic control system, which often cause the plug-in to age due to long use, or the plug-in connector is loose due to multiple disassembly and assembly, and the poor contact leads to unstable engine work (sometimes good and sometimes bad).

This is due to poor contact of one of the pins in the ECU, or the plug in the airflow sensor plug-in that is connected to the electric oil pump switch, which makes it difficult or even impossible for the engine to start. There are also other faults that are caused by "poor contact" or "short circuit", such as a car's engine that does not work in two cylinders because the power cord of the electronically controlled fuel injection valve falls off.

3. Sensor failure. Although the structure of automotive sensors is different, they are roughly the following types, such as thermistor type, vacuum pressure type, electromagnetic type, mechanical transmission type, etc.

Due to the damage of the vulnerable parts in the sensor, such as the weak elasticity of the shrapnel, the damage of the vacuum diaphragm, the weakness, fracture or fall off of the return spring, the working conditions of the engine will be fed back in a timely and accurate manner, so that the electronic control system will work abnormally or even fail, and then the engine will not work coordinated, or even not work at all.

4. The pipeline is not tightly sealed. If the hose is aging, the nozzle is ruptured or the clamp is relaxed, it will cause leakage of gas, water and oil, resulting in too thin mixture, lubrication and cooling failure, etc., which will make it difficult to start the engine, or the idle operation is unstable and weak.

5. The gasoline atomization of the electronically controlled fuel injection system is quite similar to the high-pressure nozzle injection atomization of the diesel engine. However, the nozzle of the former is mostly composed of a group of solenoid coils, armature switches, fuel injection needles and valve seats. When the needle valve is opened, the oil is injected and atomized, and the opening action of the needle valve is controlled by the electrical pulse transmitted by the ECU.

Sometimes, due to the poor work of the solenoid coil or the fuel injection needle is blocked and stuck, the gasoline of a cylinder is poorly atomized or not atomized (dripping), resulting in the poor working or non-working of the cylinder.

6. There is also a starting and enrichment device in the electronically controlled fuel injection system. It only works at the moment of start-up - the "start-up solenoid coil" opens the needle valve at the moment of start-up and closes the needle valve immediately after starting. How well it works directly affects the starting performance of the engine.

The motorcycle's EFI engine with the same type of carburetor.

The engine is not much different, except that some parts have some sensors installed. EFI mainly replaces the carburetor with an EFI system, and the engine structure is basically the same. The EFI system is composed of multiple parts, most of these parts are replaced when they are broken, and most of the parts themselves cannot be repaired, but it is not necessary to replace the entire EFI system.

The EFI engine is shown below.

2.EFI and carburetor are the difference between the ignition control system and the fuel supply system, and are not directly related to the engine life. In terms of advanced degree, EFI is more advanced.

The carburetor is the amount of oil that the driver gives the engine as much oil as it wants, while the EFI is the amount of oil that the engine needs. EFI has more advantages in cold starting, energy saving and environmental protection. As for the longevity and durability, it has the most to do with its own quality, and has little to do with EFI or carburetor.

3.EFI replaces the original carburetor, and the ignition control system is not the same, not the engine is different, of course, the EFI engine is also different from the carburetor engine, mainly adding a few sensors and the like, but the other main parts are still no different.