misfire on #1

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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, misfire on #1 in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; I just changed all the coil packs (I've gotten codes on 2 of them in the past and now a ...
  1. #1
    nuskool is offline Cadillac Owners Fanatic
    Automobile(s): 07 CTS w/ performance pkg, 18" wheel pkg
    Join Date
    Oct 2008

    misfire on #1

    I just changed all the coil packs (I've gotten codes on 2 of them in the past and now a misfire on #1, I got a deal for all 6 so I changed them all) and was going to replace the plugs but I was mailed the wrong ones. So I WILL be changing the plugs. I did re-gap the ones that were in there.

    But anyway, what else could cause a misfire?

    It seems to be running fine. My code reader says it's resetting the code, but as soon as I start the car the engine light is on and stays on. Prior to changing the coil packs we would get a brief flashing engine light (not even a minute) and then it would turn off all together. This would be right after a hard start or running a little rough, but then it smooths out and runs fine for a few days before it starts up again.

    I thought maybe one of the new coil packs was bad so I swapped in the one that the dealer changed last year. Still getting a misfire on #1 (That's the front passenger side BTW)

    Please give me some clues

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  3. #2
    Argent1's Avatar
    Argent1 is offline Cadillac Owners Connoisseur
    Automobile(s): '07 CTS 3.6
    Join Date
    Nov 2010

    Re: misfire on #1

    Injector ? Wiring ? Loose connection ? Bad ground ?

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