What Causes Engine Idle Shaking but No Shaking When Accelerating?
2 Answers
The reasons for engine idle shaking but no shaking when accelerating are: 1. Changes in fuel injection quantity, causing the engine speed to fluctuate; 2. Malfunction in the fuel pump pressure regulator or sensor, leading to incorrect fuel injection correction signals; 3. Cracked vacuum booster pipe; 4. Carbon buildup or dirt on the throttle body, or incorrect throttle position sensor alignment. An engine (Engine) is a machine capable of converting other forms of energy into mechanical energy, including internal combustion engines (reciprocating piston engines), external combustion engines (Stirling engines, steam engines, etc.), jet engines, electric motors, etc. The term engine can refer to both the power-generating device and the entire machine including the power unit.
I've been driving for over a decade and encountered similar issues. Engine vibration at idle but smooth acceleration usually occurs because the low idle speed makes engine operation unstable, while higher RPM during acceleration masks the problem. Common causes include: aged spark plugs or excessive carbon buildup leading to poor ignition; incorrect air-fuel ratio, possibly due to clogged fuel injectors; dirty throttle body affecting air intake; loose engine mounts causing resonance; vacuum leaks resulting in insufficient power. I recommend first checking spark plugs or air filters yourself and cleaning them. If no improvement, visit a professional shop for diagnosis. Regular maintenance like oil changes and throttle body cleaning can prevent these issues. Don't ignore it – idle vibration affects fuel economy and may damage the engine long-term. Simple repairs can fix it, so don't delay.
