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Popping and cutting out after header install?

This is a discussion on Popping and cutting out after header install? within the External Engine forums, part of the LSx Technical Help Section category; After I installed my Pacesetter LT's, the car cuts out and pops in the upper rpm's. It is fine with ...

  1. #1
    Junior Member
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    2000 black T/A Vert
    Red 99 C5 Coupe sold

    Popping and cutting out after header install?

    After I installed my Pacesetter LT's, the car cuts out and pops in the upper rpm's. It is fine with regular driving.
    anyone else had this problem?
    Thanks,
    Shawn

  2. #2
    Member Transam388's Avatar
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    White
    98 Trans AM

    Is it throwing a SES yet? I dare say it is someything easy like an O2 sensor that did not get re connected all the way so your fuel mixture is getting messed up.
    98 T/A: HPE 5.3 Heads, 238/242 113 cam, Kooks 1 7/8 stepped LT headers, Custom Y pipe, Cut out, Borla, NW 90MM TB, FAST 90MM Intake, TB Bypass, Under Drive Power steering and Crank, 150 Dry NOS, Yella Terra rockers, 3400 TC, HPE tuning,

  3. #3
    ruff ruff rotwiler's Avatar
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    LT's, 3400 stall, FIPK,CB
    2002 Z28

    Mine did it a few days after LT header install. Was due to my air/fuel ratio being pig rich. Would pop and backfire at random times... my a/f was 10:1 started feeling a hp loss too. Once I put it on the dyno and tuned it with a wideband all is good.

  4. #4
    Veteran 0rion's Avatar
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    98 Formula
    06 duramax

    Another thing to check is your spark plugs. Very common to crack an insulator installing LT's. I'd also make sure a wire didn't fall against the headers and get cooked. Like was previously stated, make sure your O2's are hooked up correctly. The fronts harness comes down right above the k member, make sure you didn't put the rears up front by mistake.

  5. #5
    Ross
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    2001 Camaro z28

    yeah defintiley make sure u didnt put the rears up front, because its very easy to do. i did that but realized it right after i plugged them in.

  6. #6
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    2000 black T/A Vert
    Red 99 C5 Coupe sold

    would it matter which o2's I put in or are you talking about where they hook up to the harness?

    I do have codes, but have not checked them yet. I took off the agr, so I know that is one of the codes.
    Thanks,
    Shawn

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