What causes the car to shake when it starts at idle?

Common points of failure are as follows:

1.Excessive fouling of the throttle and intake.

The excessive carbon and dirt deposits in the throttle valve and the surrounding air intake, and the change in the cross-sectional area of the air channel, make the control unit unable to accurately control the idle air intake, resulting in the mixture being too thick or too thin, and making the combustion abnormal.

The common causes are: throttle carbon deposit, oil and carbon deposits in the intake tract around the throttle.

2.Inaccurate air intake.

The control unit receives the wrong air flow sensor signal and sends out the wrong command, which causes the engine idle air intake to be inaccurate, and the abnormal mixture concentration makes the engine burn abnormally, which is the indirect cause of idle instability.

Common causes are: air flow meter or its line failure; Failure of the inlet pressure sensor or its wiring; Caused by poor wiring harness contact of the engine control unit or failure of the engine control unilateral side itself.

There are several reasons for engine shake:

1. The engine has serious carbon deposits, and the most common car with serious shake is that the fuel injector throttle valve is too dirty or too much carbon;

2. Ignition system problems, check the working conditions of spark plugs, high-voltage wires and ignition coils;

3. The oil pressure is unstable, if the first pressure of the pump is abnormal or the error and poor work of the inlet pressure sensor will cause the body to shake;

4. Aging of engine parts; Excessive carbon deposits in engine emissions absorb carbon from the gasoline of the cold-start injector, which leads to a dilute cold-start mixture and difficulty starting.

Specific solutions to idle jitter:

1. The engine has serious carbon deposits. The most common cause of idle judder is excessive carbon build-up on the throttle or injector. When there is too much carbon deposit inside the engine, the gasoline sprayed by the fuel injector during cold start will be absorbed by the carbon deposit, resulting in a mixture that is too thin and making it difficult to start.

After landing, the gasoline adsorbed on the carbon deposits will be sucked into the cylinder by the engine and burned, which will thicken the mixture. The mixture is sometimes dilute and sometimes thick, which will cause idle jitter after cold start. The lower the temperature, the greater the amount of oil required for cold starts, and the more the presence of carbon deposits affects cold starts.

The solution is to clean the carbon deposits at the throttle and injector.

2. Poor ignition system and poor ignition of spark plugs will also lead to engine idling and shaking. If there is a problem, check if the ignition system is faulty and if there is too much carbon deposited in the spark plug.

3. The oil pressure is unstable. If you have cleaned the engine carbon deposits, cleaned the throttle valve or replaced the spark plug, and there is still the problem of body shaking when idling, it is recommended to go to the 4S shop to check whether the fuel supply pressure and intake pressure sensor are normal. If the oil pump supply pressure is not normal or the intake pressure sensor is incorrect, it can also cause the body to shake when idling.

4. The best way is to clean the oil circuit, clean it regularly, there is no specific experience in the research and development parameters of the clean engine from the beginning of the new car, coupled with the continuous improvement of emission standards, can not adapt to the change of fuel, all manufacturers of the engine are unable to solve this jitter problem in the short term, plus the fuel quality is not very good or the initial fuel of the new car is stored for too long, resulting in a rapid increase in the colloidal composition of the oil circuit, which will continue to pollute the fresh fuel and lead to no good fuel can participate in combustion in the later stage. The occurrence of excessive carbon deposits is especially common for China VI vehicles. We can only gradually alleviate most of the problems by maintaining clean oil circuits. The use of PNF dope fuel additives can solve the problems caused by carbon deposition.

The main cause of idle jitter;

1. The most common cause of car shaking is that the throttle valve is too dirty or the fuel injector has too much carbon.

2. When the carbon deposition inside the engine is too much, the gasoline sprayed by the cold start fuel injector will be absorbed by a large amount of carbon deposition, resulting in the mixture of cold start being too thin, making it difficult to start, in this case, only when the gasoline absorbed by carbon deposition is saturated, it is easy to get started, 3. After the car is adsorbed, the gasoline adsorbed on the carbon deposition will be sucked into the cylinder by the vacuum suction of the engine for combustion, and the mixture becomes thick, and the combustible mixture of the engine is dilute and thick, resulting in idle shaking after cold start. The lower the temperature, the greater the amount of oil required for the cold start, and the more carbon deposits will affect the smooth cold start.

Severe idle vibration is generally caused by engine cylinder failure, aging or loose foot rubber, carbon deposits, fuel system failure, etc.

Solution; The best way is to clean the oil circuit, clean it regularly, and use PNF fuel additives to solve the above problems caused by carbon deposits. The fuel quality is not very good or the initial fuel of the new car is stored for too long, resulting in a rapid increase in the colloidal composition of the oil circuit, which will continue to pollute the fresh fuel and cause no good fuel to participate in combustion in the later stage, and the carbon deposition exceeds the standard, which is especially common for China VI vehicles. We can only gradually alleviate most of the problems by maintaining clean oil circuits.

The reason for the shaking of the car when it starts at idle: the ignition energy is low, and the first problem faced by the car when it starts cold is low temperature, the temperature in the engine is not enough, and the temperature of fuel and lubricating oil is not enough, so more fuel should be injected to meet the requirements of power during cold start. The greater the gap between the spark plugs, the smaller the ignition energy.

When the fuel atomization is not good at low temperature, the fuel needs higher ignition energy, and the ignition gap of the spark plug is easy to become larger when the car is used for a long time, resulting in a decrease in ignition energy, which affects the dynamics and makes the car shake. In addition, the ignition energy can also be reduced due to the aging of the ignition coil, the aging of the high-voltage wire of the spark plug, or the leakage of electricity.

Suggestions: 1. Oil road problems: mail road problems are generally caused by oil road blockage, resulting in poor oil supply, which is manifested as engine shaking, unstable standby speed, and stalling during driving; In addition, engine shake will also occur when the oil pump fails, and the oil pump problem should be judged by disconnecting the oil pipe and checking the flow rate and flow rate.

2. Circuit problems: check whether the right fit is accurate, and the general ignition is not normal is the right fit problem; Check whether the spark plug has aged, whether the gap is the same, and whether the gap has changed; In addition, if the distributor does not work properly, it will also cause the engine to shake.

3. Mechanical reasons: check the running status of the engine, whether there is abnormal sound, valve sound; Check the working condition of the belt and whether it is loose.

1. Slight shaking is normal. (not slightly look below).

2. Excessive carbon deposition in the idle motor, air intake, intake valve and combustion chamber.

3. Irregular clutch wear. Wait.

There are too many reasons, mainly because the engine burns badly and lacks cylinders.

Mechanically, check whether the screws such as the claws and engine guards are loose.

What to do if the engine is shaking at idle.

Well, you can't understand the professionalism, it's just that the clutch is too loose, and the power of the engine is not completely absorbed, so you just put the clutch at the stepping point.

Check the engine mounts.

Check the timing. Check the spark strength.

Check the cylinder line. Check the fuel injectors.

Check the belt. Check the pulleys.

Check the torque converter (clutch).

What causes the car to shake when it starts at idle? Blackening is definitely a bad burn, but it does not mean that there is a large amount of carbon deposit. It's a bit normal, just don't do it for a long time, because this will cause serious carbon deposition in the long term, resulting in a decrease in engine performance.

It is best to adapt to 10,000 kilometers of fuel additives at a time, so that it will be very clean and free of black to prevent various follow-up problems of the engine.

There are generally several situations in engine fault diagnosis, the most common reason for the severe formation of car flutter in the engine is that there is a general cleaning agent inside the engine, which can remove carbon deposition and dismantle the engine oil to clean the carbon sludge, which is very convenient to use, and the suspension differentiation is not blocked, and the miscibility with the oil will not lead to delamination, better and safer cleaning of your engine.

There are several possibilities for engine shake.

1."The air filter is dirty, clogged, and not replaced in time, or the high-voltage line is broken and affects the ignition and causes the engine to shake.

2.Engine shake caused by spark plugs not being replaced in time or low fuel pressure.

3.Dirty throttle valves, clogged injectors, or low cylinder pressure can cause engine jolting.

1. The clutch is shaking.

Let the engine idle, put on low gear, slowly release the clutch pedal and increase the throttle to start, if the body shakes at this time, it means that the clutch is shaken.

2. The positive pressure distribution between the main and slave discs is uneven.

Often the engagement clutch compression spring elastic force is uneven, the separation lever adjustment is inconsistent and or the diaphragm spring separation finger end is uneven, which will lead to the compression of the sequence time is not synchronized, the pressure plate is uneven, and even the pressure plate is skewed, resulting in poor contact between the main and driven discs, resulting in the shaking of the clutch. Beimai auto parts network experts said that at this time, the clutch compression spring should be replaced and the release lever should be leveled.

3. The elastic force of the damping spring becomes weaker.

Beimai auto parts network experts said that the elastic force of the clutch torsional damping spring becomes weaker, the elastic force of the clutch compression spring becomes weaker, and the diaphragm spring cracks will cause the clutch to tremble when engaged. The strategy that should be adopted at this point is to replace the springs.

4. Poor contact of clutch lining.

The clutch lining is not in good contact, and the surface is hardened or glued to it, which can easily cause the clutch to tremble. At this time, the clutch lining should be re-connected.

5. Warping, skewing and deformation of the driven disc.

When the disc is warped, skewed and deformed, the clutch lining will make irregular contact during the clutch engagement process, and the pressure cannot increase smoothly. At this point, the driven disc should be calibrated or replaced.

6. Loose parts or serious wear and tear.

The clutch control mechanism is locked or loosely connected, the clutch plate spline load is seriously worn, and the first shaft of the transmission is bent, which causes the clutch to tremble. At this point, the corresponding part should be replaced.

7. The engine is loosely installed.

It is also easy to make the clutch shake when the engine is loose or when the first shaft of the transmission is not aligned with the center line of the engine crankshaft. Beimai auto parts network experts said that the engine should be tightened or replaced at this time.

8. The hoe nail on the driven disc is broken or loose.

The driven disc hoe nail is broken or loose, the driven disc steel plate is broken, and the dynamic balance of the rotating parts does not meet the requirements, which causes the clutch to tremble. At this time, the parts should be replaced or re-connected with the driven disk.

I recommend that you test it, I hope it can help you.

Question: I'm boasting together GAC Trumpchi dual-clutch automatic transmission car 200,000 kilometers of test kilometers Now there is shaking at the start You are always normal There is shaking from time to time.

The car cannot start, the idle speed is unstable, the speed is high and low, and the inspection items are as follows

1. The battery voltage of the car is low; Specific detection method: test the battery voltage with a three-purpose meter voltage level, if it is below 10V, it is recommended to replace it. If it is around 11V, it is barely used; Be prepared for replacement. It can be used above 12V;

2. Check whether it is caused by carbon deposits; If you travel about 20,000 km, focus on checking and cleaning the throttle;

3. Inspect, test and replace spark plugs;

4. Confirm the quality of the gasoline added;

5. Detecting the ignition switch;

6. Test and detect the starter, gasoline pump, sensor and other related components of the starting and oil supply system;

7. After powering on, do not start immediately, wait for 30 seconds to 1 minute, and then ignite; See if it works;

Regardless of any of the above situations, pay attention to the time when the car cannot be hit once, be sure to play again after an interval of 15-30 seconds to protect the battery but not generate power and prolong its service life.

If your operation is fine, it is a clutch problem, and if the shaking is too bad, you have to change the clutch plate and pressure plate.

If the trembling at the beginning of the semi-clutch state is not too serious, it can be said that it is normal, if it is serious, it should be that the clutch plate is uneven or the pressure plate is uneven.

If the clutch is operated properly, and the vehicle shudders, it is possible that the working surface of the clutch plate and clutch pressure plate is unbalanced, resulting in runout during operation.

I've encountered this situation you said, is it better to step on the clutch and re-oil the clutch when you are shivering?

In this case, the pressure plate diaphragm is soft, or the disc is uneven, and the clutch pressure plate should be replaced.

Several factors contribute to idle jitter:

1. The adjustment of belt tension (especially timing belt) is not adjusted well when many cars leave the factory, resulting in blind search for reasons.

2. The adjustment of the engine fixed frame (foot), especially the adjustment of the right foot (next to the coolant tank), the height of the pad is very important.

3. If there is a problem with the clutch fork and shift fork, who would have thought of it?

4. The problem of steering mechanism (including steering wheel) is mainly clearance adjustment.

5. Clutch clearance, especially for some car owners, dislikes the clutch weight and long stroke, and adjusts the clutch high, which will cause shaking when shifting and accelerating, and the clutch wear will be accelerated if the adjustment is not good.

6. The viscosity of the engine oil does not match (the difference between the north and the south is large, or the fake engine oil), the air filter is dirty, and the gasoline filter is blocked, which will also cause idle shaking and acceleration weakness.

7. Ignition system problems.

8. Problems with the oil supply system (including gasoline pump).

9. The exhaust system causes idle speed and shake, and the car should be raised and carefully checked.

10. The shock suspension has little to do with idle jitter, 11. Walking on bumpy roads, starting, braking, and cornering vibration is large, which is related to the bearing arm (especially often on the road teeth), ball cage (cage sleeve cracking), suspension, bottom guard plate (large area, few fixed points), followed by shock absorption.

12. Shake at a certain speed or within a certain speed range, check the tire pressure, dynamic balance, four-wheel alignment, tension and wear degree of each belt, bearing arm, and bottom guard.

13. Poor oil separation coordination and driving habits will also cause shaking.

14. Some engines have a back pressure pipe, if it cracks and leaks, it will also cause shaking, and the fuel consumption is high.

When encountering problems, start from the most basic place, daily inspection and maintenance are very important, and you may spend very little money to solve big problems.

In fact, any car has shaking, and there is no need to blindly pursue cigarettes, coins, and ballpoint refills.