Why does the van body shake at idle speed?
2 Answers
The reasons for van body shaking at idle speed are as follows: 1. Unstable oil pressure. If you have already cleaned the engine carbon deposits, washed the throttle valve, replaced the oil pads and spark plugs, etc., and still find the body shaking at idle speed, it is recommended to go to the 4S shop to check the fuel supply pressure and the intake pressure sensor. If the fuel pump supply pressure is abnormal or the intake pressure sensor value is incorrect and works poorly, it will cause the body to shake. The best solution is to check the oil pressure and replace parts if necessary. 2. Aging engine components, such as aging engine mounts, may cause the body to shake. Engine mounts are aging engine components, such as aging engine mounts, which may cause the body to shake. 3. The engine throttle is too dirty or the fuel injector has too much carbon deposits, causing shaking. When there is too much carbon deposit, the gasoline sprayed by the cold start injector will be largely absorbed by the carbon deposits, resulting in a too lean mixture for cold start and difficulty in starting. 4. The working performance of the idle speed motor and air intake system leakage cause the problem. Conduct a power balance test on the engine to determine the cylinder causing the idle speed value to shake, and then analyze and repair the fault source accordingly.
I've been driving a van for several years, and idle vibration is quite common, often caused by carbon buildup. Spark plugs get covered in black carbon after prolonged use, leading to uneven ignition and engine shaking; when the throttle body is dusty, airflow becomes irregular, making the car sputter like it's sneezing. Worn engine mounts are another frequent culprit—those rubber cushions harden and crack over time, transmitting vibrations directly to the chassis, making the seat tremble at stoplights. Diagnosis is straightforward: check spark plug color (replace if blackened) or listen for uneven engine noise, which may indicate clogged intake passages. Ignoring it increases fuel consumption and creates unsafe, costly driving conditions. I recommend cleaning the throttle body every 10,000 km and replacing spark plugs promptly—don't let minor issues escalate.
