What Causes Neutral Gear Shaking?
2 Answers
The reasons for engine shaking in neutral gear are as follows: 1. Poor gasoline quality: This is usually caused by filling up with low-quality gasoline at non-standard gas stations, leading to incomplete combustion of the air-fuel mixture during engine operation and triggering the engine fault light. While this does not affect driving safety, it may cause some degree of harm to the engine. 2. Oxygen sensor failure: Modern cars are equipped with two oxygen sensors, one before and one after the three-way catalytic converter. The front oxygen sensor detects the air-fuel ratio under different engine conditions, and the ECU adjusts the fuel injection amount and calculates the ignition timing based on this signal. The rear sensor mainly monitors the performance of the three-way catalytic converter. Therefore, if the oxygen sensor is damaged or the sensor connector is faulty or loose, it can cause the air-fuel mixture to become too lean or too rich, leading to the illumination of the fault light.
I've been driving for over a decade and have encountered neutral gear vibration issues several times. The main cause is aging engine mounts - when those rubber pads crack, they lose their damping effect, allowing the entire engine's vibration to transmit into the cabin. Another reason could be clogged fuel injectors causing uneven gasoline atomization, which leads to rough idling. Worn spark plugs are also a common culprit, especially those that haven't been replaced after 40,000-50,000 kilometers - unstable ignition causes shaking. Excessive carbon buildup in the throttle body can also lead to inaccurate air intake control, making the car jerk. A minor but important detail is loose engine support brackets, which can only be seen when the car is lifted. Remember to check these areas during regular maintenance to prevent vibration problems.
