Engine Mount or Idle Issue Causing Vibration at Idle
A 2020 Ford Mustang experiencing vibration or shaking felt in the seat or floor at idle typically points to worn or damaged engine mounts, an idle air control problem, or a misfire. The vibration is isolated to idle and not during driving, suggesting the issue is related to engine movement or uneven combustion at low RPM.
Diagnosis Details
Possible Causes
Worn or broken engine mounts (especially the driver-side mount) allowing excessive engine movement at idle.
Idle air control valve or throttle body dirty/faulty causing unstable idle speed.
Engine misfire due to spark plugs, ignition coils, or fuel injector issues at low RPM.
Exhaust system contacting the chassis due to broken hangers or misalignment.
Related OBD-II Codes
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What You Should Do
Inspect engine mounts for cracks, separation, or fluid leaks.
Check idle RPM with a scan tool (should be ~650-750 RPM).
Clean throttle body and idle air control.
Perform a cylinder power balance test to identify misfires.
Check exhaust hangers and clearance.
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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.
