2002 Mitsubishi Eclipse GT Symptom Related Diagnostic Procedures

July 31, 2021

2002 Mitsubishi Eclipse GT V6-3.0L SOHC

Unstable Idle (Rough Idle, Hunting).

COMMENT

- In cases such as the above, the cause is probably the air/fuel mixture or idle air control motor. Other systems affecting idle quality include the ignition system and compression.

TROUBLESHOOTING HINTS (The most likely causes for this case:)

- Malfunction of the ignition system. - Malfunction of air/fuel ratio control system. - Malfunction of the IAC system. - Malfunction of the evaporative emission purge solenoid system. - Poor compression pressure. - Vacuum leak. - Malfunction of the EGR solenoid system.

DIAGNOSIS

Required Special Tool: - MB991502: Scan Tool (MUT-II)

STEP 1. Check if the battery terminal is disconnected.

Q: Has the battery terminal been disconnected lately?

YES: Start the engine and let it run at idle for approximate 10 minutes after engine warm up. Then, if a malfunction occurs, go to Step 2.

NO: Go to Step 2.