What is the reason for the vibration of Passat b5 idle engine?

Why does Passat b5 idle engine shake? It may be due to serious carbon deposition in the engine, ignition system problems, unstable oil pressure or aging engine components.

1. The engine has serious carbon deposition.

The most common cause of automobile 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 too thin and difficult to start. In this case, it is easy to start the car only if the gasoline with carbon deposits is saturated. After the car starts, the gasoline adsorbed on the carbon deposit will be sucked into the cylinder by the vacuum suction of the engine for combustion, which will make the mixture thicker and the combustible mixture of the engine thinner and thicker, leading to cold start. 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.

Solution: Clean the oil circuit, check whether the idle motor has carbon deposit and clean it.

2. Ignition system problems Check the working conditions of spark plugs, high-voltage lines and ignition coils. If the ignition system is not working properly, the spark plug will also cause this fault. Solution: Check the spark plug for excessive carbon deposition and replace the spark plug.

3. The oil pressure is unstable. If you have cleaned the engine carbon deposit, cleaned the throttle and replaced the oil pad and spark plug. 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. Solution: Check the oil pressure and replace parts if necessary.

4. The aging of engine parts and automobile jitter are also related to the aging of engine feet (also known as claw pads). 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.

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