Engine Mount or Idle Issue Causing Vibration at Idle
The 2019 Nissan Altima experiences noticeable vibration in the seat or floor when idling. This is often due to worn or collapsed engine mounts, a dirty throttle body, or a failing idle air control system. The vibration is isolated to idle and does not occur while driving, pointing to an engine-related issue at low RPM.
Diagnosis Details
Possible Causes
Worn or collapsed engine mounts (especially the lower or passenger side mount) allowing excessive engine movement at idle.
Dirty throttle body or idle air control valve causing unstable idle speed and vibration.
Faulty spark plugs or ignition coils causing a misfire at idle.
Related OBD-II Codes
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What You Should Do
Inspect engine mounts for cracks, sagging, or fluid leaks.
Check idle speed and smoothness using a scan tool.
Clean the throttle body and idle air control valve.
If mounts are worn, replace them.
If idle is rough, check for misfire codes and replace spark plugs or coils as needed.
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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.
