Engine Mount or Idle Issue Causing Vibration at Idle
The vehicle vibrates or shakes in the seat or floor when idling, which typically points to engine-related issues such as worn engine mounts, a misfire, or an idle air control problem. The vibration is isolated to idle and not during driving.
Diagnosis Details
Possible Causes
Worn or broken engine mounts (especially if vibration is felt in the seat/floor at idle)
Engine misfire due to spark plugs, ignition coils, or fuel injectors
Idle air control valve or throttle body dirty/faulty causing rough idle
Vacuum leak affecting idle stability
Related OBD-II Codes
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What You Should Do
Inspect engine mounts for cracks or separation.
Check for misfire codes and perform a visual inspection of spark plugs and coils.
Clean throttle body and idle air control valve if applicable.
Check for vacuum leaks using a smoke machine or propane test.
Related Repairs
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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.
