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car running bad....

This is a discussion on car running bad.... within the General Help forums, part of the LSx Technical Help Section category; I had my car in a local shop here getting some work done. They installed my QTP heades, QTP y-pipe, ...

  1. #1
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    2002 transam ws6

    car running bad....

    I had my car in a local shop here getting some work done. They installed my QTP heades, QTP y-pipe, MSD wires, NGK plugs, and borla cat-back. The 1st day I got it back it ran like crap and my ses light starting flashing at me. I stopped by Thunder Racing and one of my spark plug wires was loose. They will be giving it a basic tune this Monday. My problem is that I don't have the low-end tourqe like I use to have before. When I take off it just lags a bit then it takes off eventually. I here a little knocking underneath my car, wtf? Has anybody had this happen to them before? What fixed the problem? Will the tune take care of this. I'm just really sick that I had all this work done and my car runs like crap and it seems slower.

  2. #2
    Senior Member INMY01TA's Avatar
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    2001 Trans Am (sold)

    It may "seem" slower on the low end but the top end will more than make up for it. Let Thunder tune it. If the y pipe is banging the floor board, tell them. They should be able to take care of that as well. I bet a "post long tube" quarter mile ET slip will say your car is faster.

  3. #3
    Senior Member SeVeReDiStOrTiOn's Avatar
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    05 Wrangler
    00 Z28 sold :-(

    Don't go back to that local shop, if they gave you the car back with loose wires then they're not worth a shit...especially after spending the money that you did there.

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    2002 transam ws6

    What would a cracked spark plug cause the car to do? It just hesitates before it takes off. Seems like it is missing. I've noticed my gas mileage seems shitty!

  5. #5
    Senior Member SeVeReDiStOrTiOn's Avatar
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    05 Wrangler
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    Is the ses light still flashing? A crack plug can cause a miss..

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    2002 transam ws6

    Its not flashing anymore. It just stays on. He told me the tune will turn it off. I guess my questions is, is this normal after a header install for it to seems like it lagging on the low end. It doesn't want to spin the tires like it use to.

  7. #7
    Senior Member INMY01TA's Avatar
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    Never heard anything but good about Thunder. When they tune it the SES light will go off.

  8. #8
    Senior Member INMY01TA's Avatar
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    Long tube headers will make your gas milaege take a dump. Maybe you should have looked into the pros and cons before doing these mods.

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    2002 transam ws6

    I did my research but I didn't think it would be this bad. Hopefully the tune will fix alot of my problems.

  10. #10
    Member SSpdDmon's Avatar
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    Make sure your sensors (MAF, front O2's, etc.) are connected and working properly. If they couldn't hook up a plug wire right, who knows what else they may have missed.

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