What is the cause of engine jitter, and how much engine jitter is normal
1. The engine foot glue is aging or loose
Engine foot glue is the rubber block between the engine and the frame. Its function is to reduce the vibration and cushioning of the engine when it is working, and it has the effect of fixing the engine. Once these engine mounts are aging or loose, the jitter of the engine will be very obvious.
2. The engine lacks cylinders
Engine lack of cylinders mainly refers to the fact that the engine has one or more cylinders that are not working properly. The general performance is: the exhaust gas flow from the car has obvious intermittent, and the exhaust pipe shakes severely. It is obvious that the engine shakes, sometimes accompanied by sudden bumps. the sound of. This is mostly related to the failure of the ignition coil.
3. Engine carbon deposit problem
The carbon deposits here include cylinder carbon deposits, throttle valve carbon deposits, spark plug carbon deposits, intake carbon deposits, etc. These positions are closely related to the engine's power output. When the engine's internal carbon deposits are too much, the ignition energy of the car will decrease. The reduction in air efficiency will eventually cause the engine to shake and accelerate weakness.
4. Fuel system failure
Adding an unsuitable fuel label (for example, No. 93 is added to No. 90), resulting in a decrease in vehicle output and power; or because the vent of the fuel tank cap is blocked, the fuel tank switch, fuel filter, and fuel tank to the carburetor are blocked. Part of the oil pipe is blocked, which cannot meet the required oil supply, resulting in the mixture is too thin and the engine shakes.
5. Malfunction of intake system
Air is one of the power sources of the engine. If the air filter is not cleaned in time for a long period of time to cause blockage, insufficient air will cause the combustible mixture to be too rich and reduce the engine power; if it is a vehicle with a turbocharger, Once the supercharging device fails, it will also cause the engine to shake when accelerating.
6. Cold start
When a car is started cold, the engine lubrication effect is poor, the oil fluidity is poor, and the oil is relatively viscous, so there will be abnormal noises of mechanical wear, and when a cold car starts, the coolant temperature is relatively low, the mixture is relatively thick, and the combustion is insufficient It will cause the engine to shake and merge. This is generally a normal phenomenon, and it will get better after a hot car.
How much engine shake is normal
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, it is inevitable to jitter when the engine is working, but under normal circumstances, the jitter of the car engine should be very stable and regular. If you can clearly feel that the car’s recent jitter has increased or has continued, then pay attention to overhaul. There are several kinds of jitter: high-speed jitter, idling jitter, and individual car owners may even experience jitter.