2003 Cts 3.2l misfire.
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Cadillac CTS First Generation Forum - 2003 - 2007 Discussion, 2003 Cts 3.2l misfire. in Cadillac CTS Coupe, Sport Sedan and Sport Wagon Forums; Hey Guys this is my first post. I have a 2003 Cts 3.2l with 89k miles and i just replaced ...
  1. #1
    garciajoaquin's Avatar
    garciajoaquin is offline Cadillac Owners Member
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    Angry2003 Cts 3.2l misfire.

    Hey Guys this is my first post. I have a 2003 Cts 3.2l with 89k miles and i just replaced my head gasket, sparkplugs, water pump, oil cooler, timing belt, intake gaskets; because i was getting oil in my water system. Problem is now that im getting engine codes p0300, p0302, p0304, p0306 and pending p0302, p0304, p0306. I gapped all my spark plugs to 0.053 and still having the codes. I was wondering if it might be the timing belt.


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    jran0823's Avatar
    jran0823 is offline Cadillac Owners Connoisseur
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    2,4, and 6 are all on the same coil. It could be a bad coil, or the belt could be off. Line up your marks and see where everything falls. Then go from there.

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    garciajoaquin's Avatar
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    Re: 2003 Cts 3.2l misfire.

    Ok i sure will work on that. This car has been a pain in the a$$ to fix.

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    briggy's Avatar
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    Re: 2003 Cts 3.2l misfire.

    Do a compression test to rule out a misaligned head gasket, or valve issues. Then recheck your wiring for your coil packs & injectors. Make sure all your grounds are correctly seated. When I did my rebuild I had a similar issue and it was because I never tightened down one of the ground terminals on the injector circuit.

    Quote Originally Posted by garciajoaquin View Post
    Hey Guys this is my first post. I have a 2003 Cts 3.2l with 89k miles and i just replaced my head gasket, sparkplugs, water pump, oil cooler, timing belt, intake gaskets; because i was getting oil in my water system. Problem is now that im getting engine codes p0300, p0302, p0304, p0306 and pending p0302, p0304, p0306. I gapped all my spark plugs to 0.053 and still having the codes. I was wondering if it might be the timing belt.

  7. #5
    garciajoaquin's Avatar
    garciajoaquin is offline Cadillac Owners Member
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    Re: 2003 Cts 3.2l misfire.

    I checked my timing belt and compression test. All good. Next going to check my ground cables for the coils.

  8. #6
    garciajoaquin's Avatar
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    Re: 2003 Cts 3.2l misfire.

    @briggy where is the ground to the injector circut.

  9. #7
    Teedoe's Avatar
    Teedoe is offline Cadillac Owners Enthusiast
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    I also read that you can check the fitting of the fuse box under the hood. Wires could be loose.

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    Re: 2003 Cts 3.2l misfire.

    Oh ok i will check that next. Thank you.

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    Antsrcool is offline Cadillac Owners Member
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    Re: 2003 Cts 3.2l misfire.

    if your a couple teeth off on one of the cams it wont show up in a compression test. Need to pull that cover to make sure all lines up well.

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    Re: 2003 Cts 3.2l misfire.

    I did pull out the timing cover and all lines up . im thinking a vacuum leak.

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    Re: 2003 Cts 3.2l misfire.


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    neriah is offline Cadillac Owners Member
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    Re: 2003 Cts 3.2l misfire.

    did you replace all the coil packs? I'd start there.

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    Re: 2003 Cts 3.2l misfire.

    No I have not replaced the coil packs. They run 95 for each. Ouch. Im Thinking its a vacuum line problem because during the time of putting the car together we lost track where the vacuum lines went.

  16. #14
    jran0823's Avatar
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    If it was a vacuum line the misfires wouldn't be isolated to one bank.

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    Re: 2003 Cts 3.2l misfire.

    OOoooo i see. Is there any way to test if the coil pack is bad.

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