Idle problem

CALVIN Q MCQUEEN

MEMBER
2002 MITSUBISHI GALANT
3.0L
V6
2WD
AUTOMATIC
197,749 MILES

The car is barely idling above 500. It is rough doing take off and when sitting at a light. I had it checked for Error Codes (P0102, P0141)I replaced three of the HO2S(1-1, 1-2, 2-1) also replaced MAF sensor Cleaned throttle body, changed spark plugs and wires and yet the engine is still having idle problem. I even made adjustment with the idle needle just to keep it from stalling out.

3 Replies

JACOBANDNICKOLAS

MECHANIC
108,328 POSTS

Have you checked engine compression?

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Thursday, June 30th, 2016 AT 8:22 PM

CALVIN Q MCQUEEN

MEMBER
2 POSTS

No I have not. Car will start as long as I push down on the accelerator. I think my throttle is going bad.

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Friday, July 1st, 2016 AT 5:19 AM

CARADIODOC

MECHANIC
33,757 POSTS

Hi guys. I'll stick my nose in here in case JACOBANDNICKOLAS is gone for the holiday.

Was the battery recently disconnected or run dead? This is a real common problem with Chrysler products, and they have a lot in common with Mitsubishis. If memory 12 volts was lost to the Engine Computer, it has to relearn "minimum throttle" before it will know when it has to be in control of idle speed. Until that is done, the engine may not start unless you hold the accelerator pedal down 1/4", you won't get the nice idle flare-up to 1500 rpm at start-up, and it will tend to stall at stop signs.

To meet the conditions for the relearn to take place, drive at highway speed with the engine warmed up, then coast for at least seven seconds without touching the pedals.

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Friday, July 1st, 2016 AT 8:56 PM