What s the deal with intermittent engine shake at idle?

Causes of intermittent engine shake at idle:1. Excessive carbon deposition inside the engine.

2. There is a problem with the ignition system.

3. The oil pressure is unstable, and the oil pump cannot supply oil in time.

4. The engine cylinder pressure is insufficient.

5. The additional air valve is not opened or the opening is too small when the car is cold.

6. The injector is poorly atomized or partially blocked.

Solution:Parts with insufficient fuel injection caused by carbon deposits should be inspected in time or replaced as appropriate. When there is a problem of lack of cylinder, there is a problem in the ignition system, at this time, the following spark plugs, high-voltage wires and ignition coils should be checked, and the problem can be solved after judgment.

If the car has not cleaned the throttle valve for more than 20,000 kilometers, such a situation occurs, then it needs to be cleaned, and it must be disassembled and cleaned, otherwise the cleaning will not be complete.

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.

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

1.Serious engine carbon deposits: Cars always have the problem of carbon deposits, including cylinder carbon deposits, throttle carbon deposits, spark plug carbon deposits, intake carbon deposits, etc.

When the engine has too much carbon deposit, it will affect the ignition energy, air intake efficiency and air-fuel ratio of the car, resulting in the unstable power output of the car, and the phenomenon of idle speed and acceleration jitter appears.

2.Unstable oil pressure: If you have cleaned the engine carbon deposits, cleaned the throttle, replaced the oil gasket and spark plug, etc.

And when idling, you still find that the body shakes, it is recommended that you go to the 4S shop to check whether the oil supply pressure and intake pressure sensor are normal, if the oil pump supply pressure is abnormal, or the intake pressure sensor value is wrong, and the work is not good, it will cause the body to shake.

3.Engine cylinder shortage: Engine cylinder deficiency mainly refers to the engine one or more cylinders are not working properly, which is generally manifested as:

The exhaust fumes coming out of the car are obviously intermittent, and the exhaust pipe shakes violently, and the engine shake can be clearly felt, sometimes accompanied by abnormal noises. This is mostly related to ignition coil failure.

4.Aging of engine parts: Shake in the car is also associated with the aging of the engine feet (also known as claw pads).

The engine foot is actually the shock absorber system of the engine. The engine feet are responsible for absorbing slight vibrations when the engine is running. If there is a problem with the engine base, these vibrations can be transmitted to the steering wheel and cab, causing vibrations at idle.

Solution; 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 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 factory 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. 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.

1. The lack of cylinders in the engine, 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 intermittentness, and the exhaust pipe shakes violently, and the shaking of the engine can be clearly felt, sometimes 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; In the case of a vehicle with a turbocharger, a failure of the supercharger can also cause the engine to shake during acceleration.

A burst of engine idle shake means that the vehicle has one of three conditions:

The first is the unstable oil pressure. If you have cleaned the engine carbon deposit, washed the throttle, changed the oil cushion and spark plug, etc., and still found that the body shakes when idling, it is recommended to go to the 4S shop to check the fuel supply pressure and intake pressure sensor, if the oil pump supply pressure is abnormal or the intake pressure sensor value is wrong and the work is not good, it will cause the body to shake. The best solution is to check the oil pressure and replace the parts if necessary.

The second is the aging of engine parts, such as the aging of engine feet, which may cause the body to shake. The engine foot is actually the shock absorption system of the engine, and the engine foot is responsible for absorbing the subtle shake of the engine when it is running, and if there is a problem with the engine foot, these vibrations will be transmitted to the steering wheel and cab.

The third is that the engine throttle valve is too dirty or the fuel injector is too much carbon deposited and causes shaking. When there is too much carbon deposit, the gasoline sprayed by the cold start injector will be absorbed by the carbon deposit, resulting in the cold start mixture being too thin and difficult to start. After the car hits the car, the gasoline adsorbed on the carbon deposit will be sucked into the cylinder by the vacuum suction of the engine for combustion, so that the mixture becomes thicker, and the combustible mixture of the engine is dilute and sometimes thick, causing idle shaking.

The solution is to clean the oil circuit and check whether the idle motor has carbon deposits and should be cleaned.

1. The engine has serious carbon deposits

Engine carbon depositsI believe that many old drivers know that if there is too much carbon in the engine, the vehicle will have poor engine working condition, high fuel consumption and even difficult starting, which will cause greater damage to the vehicle over time.

The carbon accumulation of the engine is caused by the bad habits of daily driving, such as idling for a long time, slamming on the accelerator and braking, poor oil quality, high-end and low-speed driving, and no regular maintenance.

2. There is a problem with the ignition system.

When some components of the ignition coil of the arc system of the automobile or the circuit are broken or short-circuited, the primary current is too small, the secondary voltage is too low, and the ignition adjustment fails in advance, it will lead to the unstable state of engine operation, which will make its acceleration performance deteriorate, the power and fuel economy will deteriorate, and the problem of idle jitter will also occur.

3. The oil pressure is unstable

There are many factors that cause unstable engine oil pressure, such as lack of oil, dirty oil, thinning of oil, leakage of oil pipes, damage to the oil pump or excessive wear of its parts, etc. It is worth mentioning that if the engine continues to run under the condition that the oil pressure is too low, the situation may cause the engine to "burn the tile", and the engine will not start at this time, and the tile needs to be scraped or replaced.

Common engine failures.

Needless to say, the phenomenon of engine oil leakage is mainly caused by many reasons, and the harm caused by different degrees is also different. Engine oil leakage is mostly caused by the aging of the sealing gasket, and the common oil leakage parts include oil pan gasket aging and damage or loose screw oil leakage, oil drain screw loose oil leakage, leakage gasket, screw buckle damage, timing gear cover gasket aging and oil leakage.

The valve chamber cover gasket seal is not tight and leaks, the crankshaft front and rear oil seals are leaking, the oil radiator gasket is aging and the sealing is not tight, the filter base gasket is aging and the sealing is not tight, and the solution is also very simple, according to the degree of oil leakage, replace the gasket or components.

Analysis of the causes of car shake:

1. Cold start jitter.

First of all, starting from the cold start, the main reason for the cold start body shaking is that the fuel combustion is insufficient, resulting in insufficient power of the car. The ignition energy is low, and when starting, especially when the temperature of the fuel and lubricating oil is low, more oil is required to meet the power. Over time, the pole gap of the spark plug gradually increases, resulting in a decrease in ignition energy and poor fuel atomization, which leads to the shaking of the body.

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.

2. Suspension system problems.

Body shake is also related to the aging of the suspension system. It is mainly responsible for filtering out the shake of the engine when it is running, and if there is a problem with the suspension, these vibrations will be transmitted directly to the steering wheel and cab, affecting the driving. When the engine is idling, it is easy to cause shaking when the electrical system in the car is turned on.

The engine will increase the load when the electrical appliances are turned on, causing the idle speed to drop, and to compensate for the jitter caused by the idle slip, the engine will automatically increase the speed by partially. So, when the electrical system, especially the air conditioner, is turned on, the engine will often shake. This jitter is likely to be caused by the aging of the shock absorber and needs to be replaced in time.

3. Tire problems.

For tires, the tire must be balanced once when the car is replaced with new tires and new steel rims, otherwise the steering wheel will be prone to shake when the counterweight is uneven. If you find that the tire weight is not equal, you need to add lead to the inside of the rim to average the weight of the tires on both sides. Whether it is a general steel ring or a lightweight aluminum ring, it may deform or crack when subjected to a certain external force.

Deformation of the rim can cause shaking when driving, uneven weight of the rim can also cause shaking when driving, and incorrect angle of the rim can also cause shaking when driving.

4. Throttle problems.

The most common cause of car shake may be a dirty throttle valve and excessive carbon build-up in the fuel injector. After the car travels for a period of kilometers, the throttle valve will be too dirty to cause the throttle to close loosely or the idle motor to stagnate, resulting in the engine idling speed is too high, and the carbon deposits generated by the engine in this process will also cause the vehicle to shake, especially when starting the vehicle, the engine will shake more than normal, and even sometimes there will be a phenomenon that can not be started at one time. Therefore, when the body shakes, the first thing to do is to check the throttle and fuel injectors.

If you find that the throttle valve is too dirty or the fuel injector has too much carbon deposit, you should clean it with fuel injector cleaner or throttle cleaner in time.

5. The oil pressure is unstable.

If you still find that the body shakes after these are finished, it is recommended that you go to the repair shop to check whether the fuel supply pressure and intake pressure sensor are normal, if the oil pump supply pressure is not normal, the intake pressure sensor is wrong and improper work will cause the body to shake.

The fuel filter element is blocked, and the oil path is not smooth;

The governor is worn and loose;

rack or trolley hairpins;

The oil pump is aging and the oil supply is unreliable;

Inaccurate oil supply time;

The grease nozzle is stuck and the atomization is poor;

The cylinder is worn, and the cylinder pressure is unstable;

Loose valve closing; ......

Engine Idle Intermittent Jitter This problem is caused by inappropriate combustion emissions detected by the sensor. It's not a big problem, as long as you start with a clean oil circuit. If it is a new car, it is not a problem with accessories, because the oil circuit is not clean for a long time or the fuel at the gas station will also cause the oil to become dirty, because the gas station is to clean the oil tank, so the private car must also be clean.

Long-term combustion is not good is carbon deposit, the exhaust pipe is black (direct injection car), the solution is very simple, the fuel tank plus the company has general additives, once clean the oil impurities tape and moisture, if the oil carbon deposition price is large, you can use it more once.

Intermittent shaking at idle speed is normal, many cars will appear, the general situation is that the throttle, fuel injector, and air intake tract are dirty, and a small part of the reason is that the spark plug ignition is not normal, but your kilometers are not much, so it's okay. It is recommended to run more high-speed or high-speed running, if the landlord can be cleaned, but more than 20,000 kilometers to wash these is a bit of a waste.

1. The lack of cylinders in the engine, 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 intermittentness, and the exhaust pipe shakes violently, and the shaking of the engine can be clearly felt, sometimes 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; In the case of a vehicle with a turbocharger, a failure of the supercharger can also cause the engine to shake during acceleration.