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List of the contents of this article:

• 1. Common faults and maintenance methods of automobile engines
• 2, How to deal with car engine failure?
• 3, Diagnosis and elimination of common engine faults
• 4, What are the methods of diagnosis and elimination of engine abnormal noise
• 5, What is the fault diagnosis of the engine?
• 6  、Causes and diagnostic elimination methods of engine idling instability

Common faults and maintenance methods of automobile engines

1. There are many reasons for abnormal jitter of the engine. The most common is idle jitter caused by dirt on the throttle valve. Others include spark plug poor operation, ignition coil damage, engine mechanical failure, etc. In addition, engine foot damage is also one of the common causes of engine jitter failure.

2. Common faults and elimination methods of automobile engines: diagnostic elimination methods and procedures. 1 Start gear, the starter and engine cannot run, and the start-up system fault should be detected.

3. Fault 1: Engine overheating failure.Due to the special structure of the car engine, it is easy to have excessive coolant temperature during operation. Once the coolant temperature exceeds the normal value, the engine cannot dissipate heat normally, which will cause the engine to overheat and affect the normal operation of the engine. Fault 2: The smell of the engine compartment.

4. This article will introduce the common faults of automobile engines and their maintenance methods to help readers better understand and solve these problems. The engine cannot be started. The engine cannot be started due to battery failure, ignition system failure, oil supply system failure and other reasons.

How to deal with car engine failure?

1. The car shows that the engine failure should be repaired in the repair shop, causing the car to start.There are many reasons for the failure of the machine, including sensor failure, such as water temperature sensor, crankshaft sensor, oxygen sensor, etc.; there are also other fault lights caused by spark plug failure, ignition coil failure, fuel pump failure, oil line blockage, etc.

2. Repair the fuel supply system: If it is found that the fuel consumption has increased, accompanied by engine shaking, power degradation and other problems, it may be caused by the failure of the fuel supply system. At this time, it is necessary to check the oil supply system, determine the cause of the failure and repair it in time. Engine oil leakage Engine oil leakage may cause vehicles to pollute the environment, damage the engine and other problems.

3. If the exhaust gas is blue, the problem of burning engine oil should be solved. There may be a problem with the spark plug or valve oil seal. It should be checked in time and replaced with a new part if necessary. Control moistureLubricating oil consumption The normal operation of the engine inevitably consumes a certain amount of lubricating oil. Abnormal lubricating oil consumption often corresponds to some kind of engine failure.

4. Common faults and solutions of cars: the engine cannot start. Reason: The engine has been flushed, resulting in moisture in the water inflow of the distributor, ignition module, spark plug, high-voltage line, etc. The spark plug is damaged. The battery voltage is insufficient. Inertial switch disconnection; Prevention and solution measures: avoid direct flushing of the engine.

5. Start and turn off the vehicle three times in a row. Turn off the ignition and pull out the negative pole of the engine battery, wait for 30 seconds to connect it, and then try to start. It can be eliminated after using the fault detector to troubleshoot at the 4S store.

6. Common faults of automobile engines Fault 1: Engine overheating fault.Due to the special structure of the car engine, it is easy to have excessive coolant temperature during operation. Once the coolant temperature exceeds the normal value, the engine cannot dissipate heat normally, which will cause the engine to overheat and affect the normal operation of the engine. Fault 2: The smell of the engine compartment.

Diagnosis and elimination of common engine faults

1. Cause of failure: 1 There is an air leakage phenomenon in the intake system; 2 The cold start fuel injector and temperature timing switch are faulty; 3 The fuel pressure of the system is too low; 4 The fuel injector is stuck or blocked; 5 The air flow meter is faulty; 6 Water temperature sensor Fault; 7th throttlum position sensor fault; 8 ECU fault.

2. If there is still a strange smell after troubleshooting the line fault, factors such as oil attached to the surface of the engine, evaporation or combustion of foreign matter should be considered. 04 The color of the exhaust gas is abnormal. After the normal combustion of the car, the color of the exhaust gas should be colorless, and if the engine fails, the color of the exhaust gas will also change.

3. This article will introduce the common faults of automobile engines and their repair methods to help readers better understand and solve these problems.The engine cannot be started. The engine cannot be started due to battery failure, ignition system failure, oil supply system failure and other reasons.

4. Abnormal lubricating oil consumption often corresponds to some kind of engine failure. If there is abnormal lubricating oil consumption, you should first check the oil quality and oil volume, and replace the lubricating oil if necessary to avoid the engine from operating normally due to oil quality problems.

5. Diagnosis and elimination of a small number of cylinders that do not work. At various speeds of the engine, the exhaust pipe makes a rhythmic "sudding" sound, which is caused by the failure of a small number of cylinders. When diagnosing this kind of fault, at a speed slightly higher than the idle speed, the "sudden" sound of the exhaust pipe is more obvious, and it is also easier to identify it by slow acceleration.

6. Fault classification: engine control circuit failure, engine failure and other external faults.Troubleshooting ideas: In principle, first eliminate the faults of the control circuit & mdash & mdash troubleshoot the engine itself & mdash & mdash eliminates other external faults.

What are the diagnostic and elimination methods of engine abnormal noise

There is a gap between the crank connecting rod mechanism and the gas distribution mechanism when the engine is working, especially when the speed changes; It is the improper adjustment or malfunction of the engine supply system that causes the abnormal sound of the engine. The diagnosis method starts from the above two aspects.

Typical examples of common engine abnormal noise diagnosis are as follows: (1) Piston knock cylinder: disassemble and adjust the cylinder gap according to technical specifications to eliminate the abnormal sound after the piston deviates from the cylinder.(2) Piston ring leakage knocking sound: should be repaired (3) Embracing the dead piston: replace the shaft tile, grind the axle neck, and troubleshoot.

The engine foot mat is aging. The foot pad supports the engine. After aging, it cannot work normally. Just replace it. There are many plastic parts in the engine compartment, such as the engine cover, intake pipe, etc., which collide with the engine compartment when loose, causing abnormal noise. Just tighten the scattered plastic parts.

Possible causes include internal dirt in the engine, poor lubrication, abnormal combustion, long-term parking, obvious engine idle or low-speed operation, and engine overheating. Lubrication is an important condition for the normal operation of the engine. The lubrication system can achieve lubrication, cooling, cleaning, sealing and rust prevention.

Fault phenomenon When the motorcycle is running, there is an abnormal sound inside the engine.(2) Causes of failure and elimination methods During the operation of the engine, due to the operation and vibration of the parts, it will always make a noise, which can be divided into normal noise and abnormal noise.

The cause of the failure may be that the gap between the piston and the cylinder wall is too large, the connecting rod is bent and twisted, the piston is inverted elliptical or the center line of the cylinder is longitudinal offset, and some connecting rod bearings or connecting rod bushings are too tight during minor repairs and maintenance. When the engine temperature is low, the noise is obvious and weakens or disappears as the engine temperature rises.

What is the fault diagnosis of the engine?

Poor compressibility, carry out compression inspection, and repair the engine when necessary. ( 2) Air-fuel ratio poor oil, vacuum leakage, fuel injector bulge, check the imported vacuum leakage, fuel injector. ( 3) The air-fuel ratio is rich in oil, the fuel injector, the input turner is faulty, check the fuel injector, and carry out fault diagnosis.

Engine fault diagnosis steps: know the time and phenomenon of the failure; use the self-diagnostic mode of the engine management system to diagnose; check the engine system and components in detail, and confirm the location and cause of the failure. The engine management system of modern cars is a sophisticated and complex system.

Engine fault diagnosis method: manual intuitive method Artificial intuitive method is a method of determining the technical condition and fault of the machine by directly sensing by asking, seeing, smelling, touching, trying, listening, etc., or with the help of simple tools.

The basic principle of engine fault diagnosis can be summarized as follows. ( 1) First outside and then inside. When the engine fails, first check the possible faulty parts outside the engine management system. In this way, we can avoid the complexity and time-consuming sensors, computers, actuators and circuits of the system, while real faults may be easy to find but not.

Engine fault diagnosis steps: understand the time and phenomenon of fault occurrence; use the self-diagnosis mode of the engine management system for diagnosis; conduct detailed inspection of the engine system and components to confirm the location and cause of the failure.

The auditory diagnosis of automobile and engine failure is the most common and simplest method. When the car is running, the engine runs under different working conditions, and the whole car and the engine make a noisy but regular sound. There will be a strange sound when something goes wrong. Experienced people can immediately judge the fault of the car according to the abnormal sound.

Causes and diagnosis and elimination methods of engine idling instability

1. Six main reasons for unstable idling of automobile engine: mixedIf the oil-gas mixing ratio in the engine compartment of the car is not accurate, the car is easy to shake.

2. The fault problem of unstable engine idle speed is: the idle switch is not closed; the fault problem of the idle regulating valve (isc); the leakage of the intake pipe; the wrong phase of the gas distribution; the dripping or blockage of the fuel injector; the fault problem of the exhaust system; the fault problem of the water temperature sensor.

3. Troubleshooting method: unclogging or adjusting the carburetor. 4 The spark plug electrode gap is too small. The gap between the spark plug electrodes is generally 0.4~0.7mm. If the spark plug electrode gap is too small, the spark energy will be small, and the mixed gas cannot be fully burned, resulting in unstable engine idling.

4. Five common engine idling fault repair methods. What to do if the idling is unstable?Idling instability is manifested as: when idling, the engine shakes and the speed is uneven.