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Thread: need help!! misfire problem

  1. #1
    bigces435 is offline Cadillac Owners Member
    Automobile(s): 03 cadillac CTS
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    need help!! misfire problem

    hello i have a 03 3.2 cts.
    This morning i was runing late for work and low on fuel but decided to keep driving (dumbest thing i have done) ran out of gas and car start stutting barley make it to parking lot so later i grab a gas tank and go fill it up so come back and put it in the cts i start the car and now it has a rough idle! and when i drive it i step on the gas and barley has any power!
    so i let it sit for about 6 hours and i go to start it it makes a loud whinning noise coming from the belt but dont know where exactly! i found out it goes away when i turn on the AC. i alsp noticed the ac dont blow cold air anymore. The check engine light flashes the whole time the car is on! codes that come on are - Random misfire, misfire cylinder 2, 4 nd 6 ive tried clearing them but light still flashing. please let me know anything you know that could be the problem or sone of the thing i can check on it


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  3. #2
    odthetruth's Avatar
    odthetruth is offline Moderator
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    Re: need help!! misfire problem

    For it to be 2-4-6, I would think its the coil pack. Check connections on the coil packs and make sure they're plugged in good. You might have to tear it apart to pull the pack \ replace. I don't remember which side the 2-4-6 side is... on the 3.2, the drivers side is easy to change out (removing power steering res, etc). The pass side is much more difficult.

    [2006 CTS-V]
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  4. #3
    CTSUK's Avatar
    CTSUK is offline Cadillac Owners Enthusiast
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    Re: need help!! misfire problem

    My guess would be you have sucked some dirt through from the bottom of the tank, it might be the coil pack but be prepared if you do replace the coils to have to also get the injectors cleaned and possibly change the spark plugs if the errors keep on coming.
    If you have ran out of gas id advise changing the fuel filter too, it could be clogged up with dirt also.

  5. #4
    odthetruth's Avatar
    odthetruth is offline Moderator
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    Re: need help!! misfire problem

    Quote Originally Posted by CTSUK View Post
    My guess would be you have sucked some dirt through from the bottom of the tank, it might be the coil pack but be prepared if you do replace the coils to have to also get the injectors cleaned and possibly change the spark plugs if the errors keep on coming.
    If you have ran out of gas id advise changing the fuel filter too, it could be clogged up with dirt also.
    This is always a good idea if you haven't done it yearly. They get muddy as hell.

    [2006 CTS-V]
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  6. #5
    Kingoftypos is online now Cadillac Owners Master
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    Quote Originally Posted by odthetruth

    This is always a good idea if you haven't done it yearly. They get muddy as hell.
    Mine hasn't been changed since the previous owner had it done in 2007.

    Think I should replace it. Ha

    KOT

  7. #6
    odthetruth's Avatar
    odthetruth is offline Moderator
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    Re: need help!! misfire problem

    Quote Originally Posted by Kingoftypos View Post
    Mine hasn't been changed since the previous owner had it done in 2007.

    Think I should replace it. Ha

    KOT
    Definitely.

    [2006 CTS-V]
    Bolt ons and Bolt ins, and Bolt underneaths.

  8. #7
    CTSUK's Avatar
    CTSUK is offline Cadillac Owners Enthusiast
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    Re: need help!! misfire problem

    Quote Originally Posted by Kingoftypos View Post
    Mine hasn't been changed since the previous owner had it done in 2007.

    Think I should replace it. Ha

    KOT
    You should replace it with an coffee strainer, might do a better job

  9. #8
    rickparker is offline Cadillac Owners Member
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    Re: need help!! misfire problem

    you can swap coil packs with one from the other side, since the problem began with lo fuel I think I would check fuel rail on the 246 side

  10. #9
    bigces435 is offline Cadillac Owners Member
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    Re: need help!! misfire problem

    thanks for all the advise guys i really appreciate it. ill have this weekend free so i plan on getting new coil pack new filter, new plugs and yeah injectors cleaned. and i think i broke the AC compressor as well cuz i was running the ac while it was acting up on low fuel and now it don't blow cold air and was making that loud noise i mentioned.


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