Engine Misfire or Idle Air Control Issue
The whole car shakes at idle, which typically indicates an engine-related issue such as a misfire, vacuum leak, or idle air control problem. This is not a driveline or wheel vibration since it occurs only when stationary.
Diagnosis Details
Possible Causes
Engine misfire due to faulty spark plugs, ignition coils, or fuel injectors
Vacuum leak causing rough idle (e.g., cracked hose, intake gasket leak)
Idle air control valve or throttle body dirty/faulty
Engine mount failure (allows excessive vibration transfer to chassis)
Related OBD-II Codes
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What You Should Do
Check for diagnostic trouble codes with an OBD-II scanner.
Inspect spark plugs, ignition coils, and fuel injectors for misfire.
Test for vacuum leaks using a smoke machine or propane.
Clean throttle body and idle air control valve.
Inspect engine mounts for cracks or separation.
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Disclaimer: This AI-generated diagnosis is for informational reference only. Always consult a qualified mechanic for an in-person inspection. AutOwner is not responsible for decisions made based on this information.
