Idle Speed Fluctuates (MIL Works Ok, No DTCs Set)

Idle speed fluctuates (MIL works OK, no DTCs set)

Idle speed fluctuates
(MIL works OK, no DTCs set)

Do the ECM/PCM idle learn procedure ECM/PCM Idle Learn Procedure (M/T).

Check the idle speed Testing and Inspection.

Do the carbon accumulation check.

Troubleshoot the A/C signal circuit A/C Signal Circuit Troubleshooting (Idle Control System).

Also check for

Incorrect valve timing or clearance adjustment

Also check for

Intake air leaks