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Miss fire after cam install

This is a discussion on Miss fire after cam install within the General Help forums, part of the LSx Technical Help Section category; Hey guys i just installed a cam in my 1998 z-28. Now i have missfires. Mostly on cylinder 2 but ...

  1. #1
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    1998 Z-28

    Miss fire after cam install

    Hey guys i just installed a cam in my 1998 z-28. Now i have missfires. Mostly on cylinder 2 but i get them in other cyilnders as well. you can hear it in the exhaust. It does not have all the power either. this is the cam i installed.
    Cam-12565308
    2002'2004 LS6 Cam
    I: 204 E: 218
    I: .550 E: .550
    117.5
    I put new springs in the heads but the heads worked just fine before the install. do i need to have the car tuned for this cam??

  2. #2
    Unbiased Opinion 67rsss's Avatar
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    Shouldn't need a tune for an LS6 cam. Are you absolutley certain that you installed the cam in phase? Also, did you by any chance damage any wiring to the coil packs?

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    What do you mean in phase?? i have fire from the coil.

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    Unbiased Opinion 67rsss's Avatar
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    1967

    Did you get the chain and pulleys in correctly? Crank should have had the #1 at TDC (dot on gear at 12:00, and you should have had the cam gear at either 12:00 or 6:00. It can be hard to see for sure sometimes.

  5. #5
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    o ya i got it lined up. Looked as perfect as could be

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    1998 Camaro SS

    mine was misfiring like that after my cam install. i found out that i put the passenger side coil pack harness on upside down and it was firing the wrong cylinders at the wrong time.

  7. #7
    Senior Member Redphoenix1998's Avatar
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    yes the coil packs are left and right. Check the harness connector and make sure the wires match up from the harness to the main coil connector. Also check your injectors and make sure that they are all ticking. I had two bad connectors and had to replace them.

  8. #8
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    Found the problem number two plug had no gap in it must of been dropped when it was in the box. Should of paid more attention when i put them in.

  9. #9
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    Quote Originally Posted by Jerod Lamb View Post
    Found the problem number two plug had no gap in it must of been dropped when it was in the box. Should of paid more attention when i put them in.
    Exactly why I cringe when I see/hear people say they dont have to gap or didnt gap their plugs because they "come gapped from the factory".

    Glad you found your problem.

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