What Causes Body Shaking During Idle?
1 Answers
Possible causes of car body shaking during idle include: 1. Unstable oil pressure: If you've already cleaned engine carbon deposits, washed the throttle valve, replaced gaskets and spark plugs, but still experience body shaking during idle, it's recommended to visit a 4S shop to check fuel supply pressure and intake pressure sensors. Abnormal fuel pump pressure or faulty intake pressure sensor values can cause body shaking. Solution: Check oil pressure and replace components if necessary. 2. Severe engine carbon deposits: The most common cause of car shaking is excessive dirt in the throttle valve or carbon buildup in fuel injectors. When there's too much carbon inside the engine, gasoline sprayed by cold-start injectors gets largely absorbed by carbon deposits, resulting in an overly lean mixture during cold starts and making ignition difficult. Only when carbon deposits become saturated with gasoline can the engine start easily. After starting, gasoline adsorbed on carbon deposits gets sucked into cylinders by engine vacuum for combustion, making the mixture too rich. This alternation between lean and rich mixtures causes idle shaking after cold starts. Lower temperatures require more fuel for cold starts, making carbon deposits more likely to affect successful cold starts. Solution: Clean the fuel system and check if the idle control valve has carbon deposits that need cleaning. 3. Ignition system issues: Check the condition of spark plugs, high-voltage wires, and ignition coils. Poor ignition system performance or bad spark plug firing can also cause such problems. Solution: Check if spark plugs have excessive carbon buildup and replace them if needed. 4. Aging engine components: Car shaking may also relate to worn engine mounts. Engine mounts actually serve as the engine's shock absorption system, absorbing minor vibrations during operation. If engine mounts fail, these vibrations get transmitted to the steering wheel and cabin, causing shaking during idle.
