Thread: Giving up on random misfire at idle

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  1. #21 Re: Giving up on random misfire at idle 
    GXP Level Member coolone's Avatar
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    Quote Originally Posted by gingerdude View Post

    Coolone you wouldn't happen to know which side the wiring loom you're talking about is on would you? Because honestly that is literally the last thing I think it could be. Something keeps saying CPS. It gets really bad after I have been on a long drive. I would imagine a failing CPS would produce these symptoms as it warms up.
    No, the CPS is one thing, but is a long shot in my opinion and a last resort shotgun part at a problem kinda thing, roll of the dice so to say.

    But the wire break in the loom was definitely the cause. Was intermittent just like yours and really went nuts tracking it down. Is the driver side where harness leaves PCM and is real close to the condenser. And again, was in my buddies paid for mechanics database, don't know they aem of the system he used, but is a commercial product which repair shops use. It nailed the cause... Lol and just to be clear this is just on the 3100 and not applicable to the 3800. Just get in there and make a real good visual inspection, if you see anything that doesn't look right, then look closer. And for the matter, it doesn't take much to open the loom and look too.
    Overkill BBC Cam, YT 1.8 RR's, Rhodes Lifters, STGII Heads, GenV, Pacesetters, 3" Exh to Tips, TEP Trans. N*, ID 75# injectors/E85 coming soon
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  2. #22 Re: Giving up on random misfire at idle 
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    check the ICM harness connector. I have had one where one of the wires were pushed back not making contact properly.
    2017 Buick Regal 2.0 Turbo (SOLD 2007 Grand Prix GT. Front and rear PLOGs, 1.8 roller rockers, CAI, HPTuned, 3.4 pulley, TEP transmission, 90# springs, rollmaster single chain, Impala front brakes d/s rotors.) Past (Pontiacs) Grand Prix- 97 GT, 03 GT, 04 GT, 04 Comp G, 78 Trans am, 92 Trans Am.
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  3. #23 Re: Giving up on random misfire at idle 
    Donating Users gingerdude's Avatar
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    Coolone and rickisrad I will check both places for any shorts or loose wires.

    fst I don't have the egg smell and I do not believe the exhaust manifolds are clogged.

    waupachino I had the injectors off the car and tested the flow when I did the intakes so I know they are not clogged.
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