2006 Volkswagen polo 1.4 Idle Pulley
1. Serious carbon deposit in the engine: The most common reason for car jitter is that the throttle valve is too dirty or the fuel injector has too much carbon deposit. When there is too much carbon deposit in the engine, the gasoline sprayed by the fuel injection head will be absorbed by a large amount of carbon deposit during cold start, which makes the cold start mixture dilute and difficult to start. In addition, the lower the temperature, the more oil is needed for cold start and the more carbon is deposited, which will affect the success of cold start. The solution is to clean the oil circuit, check whether there is carbon deposit in the idle motor, and clean it. 2. Ignition system problems: Check the working conditions of spark plugs, high-voltage lines and ignition coils. Poor ignition system and poor ignition of spark plugs can also lead to such failures. The solution is to check whether there is too much carbon in the spark plug and replace the spark plug. 3. Unstable oil pressure: If you have cleaned the engine carbon deposit, cleaned the throttle, replaced the oil pad and spark plug, etc. And the body is still shaking when idling. I suggest you go to the 4S shop to check whether the oil supply pressure and intake pressure sensors are normal. If the oil supply pressure of the oil pump is abnormal, or the intake pressure sensor has an incorrect value and works abnormally, the body will shake. The solution is to check the oil pressure and replace the parts if necessary. 4. Aging of engine parts: Vehicle jitter is also related to the aging of engine feet. The engine foot is actually the damping system of the engine. The engine feet are responsible for absorbing slight vibration when the engine is running. If there is something wrong with the engine base, these vibrations will be transmitted to the steering wheel and cab, causing idle vibration.