Thread: Newbie Tuning Questions (car won't run, well idle)

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  1. #1 Newbie Tuning Questions (car won't run, well idle) 
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    So I finally got all my new parts swapped on this weekend and limped the car home from a friends shop using the aftermarket tune that I'd had in the car prior to the last round of mods (was a basic tune for 1.8 rr's & a 3.4" pulley). The car was running like crap, but running. Last night I swapped in my stock PCM and flashed it to remove the DTC codes, plus my transmission changes & for my new 42.5 injectors. Now when I got to start the car it will run for about 3-4 seconds & then stalls out (tried this about 7-8 times with the same results).
    Now I know that I havn't given a lot of information, Since I don't have a scan (again the car won't even run long enough to get anything), but I'm hoping that a more experenced tuner can point me in the direction of what tables I need to play with to get the car to run (idle), is it possible that since the MAF tables are completely stock that I need to play with them a little to get the car to idle properly? I know that before with the other PCM I was stupid lean @ idle & the car wouldn't rev below 2000 RPM

    Car Has:
    1.8 rr's
    96 lb springs
    ZZP Stage 1 TB
    Ported Blower
    ILGPC IC
    42.5 lb injectors
    PRJ Fuel Rails
    HAI
    SLP Headers
    Full Exhaust
    fuel pump hotwire
    AEM wideband
    8 rib crank pulley
    2000 GTP - Getting Faster All The Time
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  2. #2 Re: Newbie Tuning Questions (car won't run, well idle) 
    Bastard Reptile's Avatar
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    ok....does it start right back up, or does it crank a little? Do you have to mash the gas to start it?
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  3. #3 Re: Newbie Tuning Questions (car won't run, well idle) 
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    it will start right back up after. I have yet to play with the gas to see if I can keep the car running longer or not. I do know that the cars does lean out (as per my wideband when it stalls out, but I still have fuel pressure).
    Is it possible that my MAF is so out of wack that it won't run at all?
    before when it ran it was uber lean @ idle 17.x AFR.
    2000 GTP - Getting Faster All The Time
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  4. #4 Re: Newbie Tuning Questions (car won't run, well idle) 
    Bastard Reptile's Avatar
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    It's very possible. If you think that it's still reading lean, then add to the MAF.
    If you put all that on in one sitting, it probably does suck in a lot more air, you could also try unplugging the maf and see how it reacts.
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  5. #5 Re: Newbie Tuning Questions (car won't run, well idle) 
    TDCRacing
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    I have never seen a car do that just because of the throttlebody....It is very possible though and good suggestion...I think it has to do with the fuel injectors...have you scalled the injector table any?
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  6. #6 Re: Newbie Tuning Questions (car won't run, well idle) 
    TDCRacing
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    What were the dtc codes that you erased? check for vacume leaks?
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