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Thread: Missfire on number 5 cylinder

  1. #1
    raven2005cadillaccts is offline Cadillac Owners Member
    Automobile(s): 3.6 CTS
    Join Date
    Jun 2013

    Missfire on number 5 cylinder

    Hopefully someone can help me on this one....

    Got an error code 305 for my 2005 3.6 CTS. The car is missing at idle and also at higher speed but doesn't seem as bad. Removed coil and spark plug on #5 and noticed the plug and the coil were corroded/oxidized...thought it was obvious that one or both were bad and purchased and replaced them both....manufacturer plug and BWD coil. Noticed that the tube that surrounds the coil and spark was also corroded inside, but didn't see how to remove it so I didn't. Reset code at battery and started car, but car still has same issues. Just wondering if that tube being oxidized is why I'm still getting misfires???? and if so, is there an easy way to replace it

    Thanks for any help.....

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  3. #2
    oramac99's Avatar
    oramac99 is offline Cadillac Owners Member
    Automobile(s): 2004 CTS
    Join Date
    Feb 2012
    Phoenix, AZ

    Re: Missfire on number 5 cylinder

    Try swapping the coil boot with a different cylinder and see if the misfire follows

  4. #3
    ss4cts is offline Cadillac Owners Member
    Automobile(s): 2011 CTS 3.0 AWD Lux
    Join Date
    Apr 2008

    Re: Missfire on number 5 cylinder

    If you are 100% sure that you where actually working on 5th cylinder and not on some other one than only thing left is ECM or something weird with wiring or Injector


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