The engine shakes very obviously when it stalls, do I need to take it to the workshop for inspection

Need to go to the repair shop to check, the cause of the engine shaking when the engine is turned off:

1.It may be that there is too much carbon deposit, which will cause pre-ignition and deflagration, shorten the service life of the engine, and greatly reduce the power and economy of the engine.

2.There is carbon accumulation on the working surface of the valve and its seat ring, which will cause the valve to be closed loosely and leak, and the engine is difficult to start, weak to work and easy to ablation of the valve.

3.The deposition of the valve guide and valve stem will accelerate the wear of the valve stem and valve guide, and even cause the valve stem to move astringently in the valve guide and get stuck, resulting in sticky valve failure;

4.The carbon accumulation in the piston ring groove will make the piston ring side gap and back gap smaller, and there will be no gap, causing the piston ring to lose its elasticity and pull the cylinder; The carbon deposition of the fuel injector will cause the difference in the amount of fuel injected by the fuel injector of each cylinder, resulting in engine shaking or car chaos;

5. When the spark plug has too much carbon, it will cause the spark plug to leak and not work, and the engine shakes and other failures.

Slightly better designed passenger cars, because the engine mounts are better matched, the whole vehicle NVH is done well, and when the engine is turned off and stopped, the driver and passengers do not feel the shaking of the car body at all.

In general, the front and rear direction vibration is caused by the engine pitching vibration, which can be improved by improving the stiffness of the rear mount; The oscillation in the left and right directions is due to the mismatch of the stiffness of the left and right mounts, and generally the powertrain yaw occurs due to the small stiffness of the engine side mounts.

Solution: Change the rigidity of the engine mount to make it softer, so that the vibration of the engine is isolated from the vibration between the car body, so as to avoid the resonance of the car body when the engine is low (below idle).

The engine crankshaft is reduced from idle speed of 700r min (general vehicle) to 0, and there will be torque fluctuations, which will lead to the shaking of the engine itself. Test angle: By arranging two vibrations on the steering wheel and the body floor, and one vibration is distributed for each of the active and passive suspension measurements, it can be judged by the amplitude which suspension has the problem.

If the shaking is very obvious, it is recommended to go to the repair shop for inspection. After all, the car doesn't shake for no reason.

Feel the shaking of the car suddenly obvious a lot, then this may be because of the resonance of the car Every car has its resonance frequency, the shaking of the car is no trivial matter, it is best to go to the repair shop to see.

It's better to take it for repair, and you can check the engine fulcrum if you don't go.

The car will not shake for no reason, and if it is convenient, you should go to the repair shop to check it.

It's best to check it out.

The carbon accumulation in the piston ring groove will make the piston ring side gap and back gap smaller, and there will be no gap, causing the piston ring to lose its elasticity and pull the cylinder; The carbon deposition of the fuel injector will cause the difference in the amount of fuel injected by the fuel injector of each cylinder, resulting in engine shaking or car chaos;

There is a natural frequency in any car, and the natural frequency of the body of the car will be outside the range of vibration frequency caused by engine operation, that is, it is lower than the vibration frequency when the engine is idling.

There should be something wrong, go check it out.

EngineIdlingIn most cases, jitter and easy stalling are caused by poor performance of the ignition system or electronic fuel injection system.

1. Spark plug problem.

If the spark plug of the ignition system of the car fails, it will cause the ignition system to work poorly, the spark plug flashing condition is not good, etc., which will lead to unstable faults such as movement of the car when idling. The solution is to check the spark plugs, high-voltage wires and ignition coils.

If there is too much carbon accumulation in the spark plug, once found, clean or replace the spark plug immediately.

2. The quality of fuel

According to the survey, most of the domestic car owners have "idling" jitter and other unstable faults, which has a great relationship with the quality of fuel. Poor fuel quality can impair engine performance and cause idle jitter. The solution to this problem is to clean the car's "throttle" in time.

Fault phenomenon: unstable idle speed after engine overhaul Possible causes: 1. Idle motor damage 2. Ignition coil leakage 3. Spark plug carbon deposition or breakdown damage 4. Throttle carbon deposition 5. Spark plug gap is too large Preparation tool:

No. 16 long sleeve, ratchet wrench, test lamp, automobile fault diagnosis instrument Troubleshooting steps: 1. Use the car fault diagnosis instrument to query the fault code to determine the fault point and carry out maintenance. 2. Clean the throttle.

Idle jitter is not normal. But find an opportunity to sell it after the overhaul, or the problem, exaggerate to say one a day!

There are many reasons for engine shaking after overhaul, such as maintenance errors: pistons, timing, cylinder line ignition coils, etc. are not installed well and misaligned. It is recommended to re-inspect and repair.

If the engine piston and cylinder block knock on the cylinder, the power of the engine is insufficient and there will be oil consumption. It is clear to confirm whether the cylinder is mechanically knocked to measure the cylinder pressure. I guess you said that the knock is caused by too much valve clearance, if it is, then it's easy, adjust the valve clearance and get it done.

If it's really the piston and cylinder that makes the knocking sound, then you have to claim compensation from that repair shop!

There are many cars, the idle speed of 700 is low, not only low, there will definitely be jitter, what is your original belt speed? You ask him to transfer you back.

The engine has just been overhauled, and the idle speed is shaking, and this situation needs to be run in for a period of time, how is the experience.

This is after the run-in period and a few hours after the run-in.

When this kind of problem occurs, the general owner will drive the car to the repair shop or 4S shop, and ask the master to check whether the oil circuit is too dirty and whether there is too much carbon deposit.

At this time, the master will drive the car to the repair shop. Next, the master begins to check and start the vehicle, feel the degree of shaking of the vehicle, and check the data stream with a special computer.

And briefly understand the normal use of the vehicle with the owner, and then start a series of disassembly and assembly parts to find out the cause of the failure. The car is in a cold start.

, due to insufficient lubrication, high oil viscosity, the movement resistance of the engine increases, and the ECU increases the amount of fuel injection, resulting in idling.

Unstable, slight engine shaking.

For example, in the car below, the ignition coils of individual cylinders were found.

The ignition spark is relatively weak, and there is leakage at the rubber insulation, so the parts to be replaced are reported to the owner, and the owner is required to clean the carbon oil road. After some explanation, the general owner will agree to the repair. After the repair, I can really feel that the engine shakes a lot less.

When I sat in the car, my hands on the steering wheel.

, the engine shake can still be felt. At this time, it is generally difficult for car owners to accept that it will cost thousands of dollars.

The fault was not solved once. Of course, I will also ask the repair shop to fix the fault completely. In addition to the poor operation of individual cylinders, the fixed feet of the brigade engine are aging and sinking, causing the engine to shake.

If you have other questions, you can discuss them together. With the extension of service time, the resonance problem of the body and seat caused by engine shake will always occur. The cause of resonance is often attributed to carbon deposition or malfunction.

However, the aging of the feet is actually the most common cause! An internal combustion engine used in a combustion engine is a chemical engine that converts the thermal energy generated by the combustion of fuel into mechanical energy.

During combustion, the irregular movement of molecules inevitably produces vibrations, and the body also resonates due to vibrations caused by work.

As a result, the engine cannot be rigidly bonded to the frame. However, as the water temperature rises and lubrication is adequate, the idle speed returns to normal levels and stabilizes, and the abnormal engine shake disappears. However, if the idle speed is still unstable, the vehicle heats up.

When the engine shakes, it is likely that the engine has serious carbon deposits. Serious carbon deposition in the engine will lead to serious consequences such as cold start difficulties, unstable idling, engine shaking, vehicle weakness, increased fuel consumption, and excessive exhaust emissions.

through the free version).

1. High-voltage line disconnection refers to the disconnection of the high-voltage wire core, which affects the ignition and causes abnormal engine shaking.

2. Check whether the spark plug should be replaced, the electric spark plug has a lifespan, and the ignition efficiency will be significantly reduced after more than three kilometers, which can affect the ignition, which is the most common, and only need to replace the spark plug at this time.

3. The air filter is too dirty, and the air filter is to protect the engine from foreign matter or dust. Allow clean air to flow into the engine. If the cabin air filter is clogged, it will cause poor air circulation and the engine will shake abnormally.

4. The water temperature of the engine is abnormal, the engine has an optimal homing working temperature, if the water temperature is too high or too low, it will cause the change of the oil-gas mixing ratio, resulting in poor adhesion and lubrication, at this time, it will cause the engine to shake abnormally.

5. The idle speed of the engine is too low, the idle speed of the engine is set by the on-board computer, when the speed of the engine is low to a certain range, the driving computer of the car will automatically adjust, if the idle speed is too low, it will shake.

Attached: Judgment of engine shake:

As long as the car shakes while driving, everyone will say that the engine is shaking, and subconsciously feel that the problem is serious. In fact, shaking is inevitable when the engine is working, but under normal circumstances, the shaking of the car engine should be very smooth and regular. If you can clearly feel that the recent shaking of the car has increased or persisted, then you should pay attention to the maintenance residue.

Summary. If the engine shakes and there is no problem with the engine, then you need to check the engine foot pad to see if it is loose or the wear is relatively large, and you need to check whether the oil of the gasoline is normal, and you need to check the spark plug and ignition coil to see if there is any problem.

The car engine is shaking, and the repair shop checks the engine for no problem, what's going on?

Dear, this question is up to me, it takes a little time to type, please be patient, thank you!

Dear, this question is up to me, it takes a little time to type, please be patient, thank you!

If the engine shakes, if there is no problem with the rotten Weisen engine, then you need to check the engine foot pad, see if it is loose or wear is relatively large, and you need to check whether the oil of the gasoline is normal, and you need to check the spark plug and ignition coil to see if there is a problem.

Mine is Shaanxi Automobile Delong F3000, 2013 National III car, diesel EFI.

The feet have been checked and there is no problem.

This jitter is a problem with the engine, and the engine cannot be without problems, and it will not shake without problems. You need to check this high-pressure oil pump to see if there is any problem, and you need to check the angle of this fuel injection in advance, including Xiangkai's imitation of this fuel injector to see the atomization effect.

The phenomenon of engine shaking will involve many reasons, such as excessive carbon deposition in the intake system such as throttle and idle valve, poor fuel injection atomization of the fuel injection nozzle, and poor working performance of the ignition system, which is mainly directly related to the working performance of the spark plug, high-voltage line and ignition coil

1. The engine lacks cylinders, and the lack of cylinders in the engine mainly refers to the fact that the engine has one or more cylinders that are not working normally, which is generally manifested as: the exhaust gas flow discharged by the car has obvious intermittent intermittent gas, and the exhaust pipe shakes badly, so that the engine shakes obviously, and sometimes it is accompanied by a sudden sound. This is mostly related to ignition coil failure;

2. Carbon deposition problems include cylinder carbon deposition, throttle carbon deposition, spark plug carbon deposition, intake carbon deposition, etc., these positions are just closely related to the power output of the engine, when the carbon deposition inside the engine is excessive, the ignition energy of the car is reduced, and the air intake efficiency decreases, which eventually leads to the engine shaking, acceleration weakness symptoms;

3. Fuel system failure, adding inappropriate fuel labels (for example, No. 93 to No. 90), resulting in a decrease in the output power of the car and a decrease in power; Or due to the blockage of the vent of the fuel tank cover, the fuel tank switch, the fuel filter and the oil pipe between the fuel tank and the carburetor are partially blocked, which cannot meet the required oil volume, resulting in the mixture being too thin and the engine shaking;

4. Air intake system failure, air is one of the power of the engine, if the air filter is not cleaned in time for a long time, the lack of air volume will cause the combustible mixture to be too thick, so that the engine power decreases; If it is a vehicle with a turbocharger, the failure of the supercharger will also cause the engine to shake when accelerating;

5. Cold start, when the car is accompanied by the chain in the cold start, the engine lubrication effect is relatively poor, the oil fluidity is poor, and it is also relatively viscous, so there will be abnormal sound of mechanical wear, as well as cold start, the coolant temperature is relatively low, the mixture is relatively thick, and insufficient combustion will cause the engine to shake and, this is generally a normal phenomenon, and it will get better after the hot car.