Thread: Puzzling idle

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  1. #1 Puzzling idle 
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    Hey guys!

    My GP has progressively been idling rougher and rougher. I have replaced the TPS sensor but that wasn't the problem I guess. Secondly, whenever I disconnect the MAF the car will idle beautiful and then die so naturally I tried a new MAF sensor. The new MAF did'nt fix a thing and same thing happens when I disconnect it, the car will idle nice and smooth and then die. What do you think the problem could be? Could the fueling tables in the PCM become corrupt? I want to try a new PCM but that is another expense so I wanted to see what you guys think. I also tried disconnecting the battery to re-set the PCM but that did not help either. The car will shut-off when I have been on the highway for an extended period of time while I'm forced to decelerate quite hard.

    MOds: ZZP PCM, 3.25, headers, 1.9 rockers, intake, exhaust, fuel-rewire etc.......
    Last edited by Bio248; 08-30-2010 at 06:31 PM.
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  2. #2 Re: Puzzling idle 
    PittState Automotive Tech GAFF's Avatar
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    vac leak caused my car to do that
    SOLD 1999 GT Silvermist TS
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  3. #3 Re: Puzzling idle 
    The mod from over yonder TheOtherNick's Avatar
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    You could have gotten a bad new maf.
    01 gtp-big cam e85 dd 78dodge- guzzling fuel 05 cummins- rollin coal
    SMGPFC Two Nipple General
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  4. #4 Re: Puzzling idle 
    GrandPrix Junkie Sandman's Avatar
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    When your car shuts down do the ABS and RPM die?
    05 Saab 9-2X Linear (Saabaru)
    77 Morris Garage B
    Quote Originally Posted by TLSheff View Post
    You said "I'm done with it"... car says "Oh, really? *trollface*"
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  5. #5 Re: Puzzling idle 
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    Everything dies, all the dash lights lite up like a christmas tree. I trip codes for the MAF, TPS, and multiple misfires when it shuts off after a highway trip. Otherwise, the car does not shut off in normal city driving
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  6. #6 Re: Puzzling idle 
    SE Level Member cardiffGIANT98gtp's Avatar
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    could be the crank positioning sensor
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  7. #7 Re: Puzzling idle 
    Donating Users gtpsleeper's Avatar
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    hmmm i wouldn think a vac leak would shut him down on the highway... what exact codes are coming up? are you scanning?
    "My car is a racecar like Planet Fitness is a gym...."

    proud mark VIII victim!!! suck it...
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