Misfire - Plugs or coil pack?
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2008-2013 Cadillac CTS General Discussion Discussion, Misfire - Plugs or coil pack? in Cadillac CTS Second Generation Forum - 2008-2013; Hello all, Ever since I got my car with 5xk miles it has had a slight miss, but 3 different ...
  1. #1
    DaPurpleRT is offline Cadillac Owners Fanatic
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    Lightbulb Misfire - Plugs or coil pack?

    Hello all,

    Ever since I got my car with 5xk miles it has had a slight miss, but 3 different dealership visits told me there was no miss. I recently got a check engine light that required warranty replacement of the secondary water pump. I had just started getting the miss much more noticeably, and they assured me, somehow, this would fix the miss (still popping no codes for that). Well, picked it up, miss remains, took it back and they inform me though the car is giving ME no codes, it did show them it had a miss due to plugs needing replacing (now at 8xk miles). I went on home and a few days later and now I am getting a violent miss and finally popping a code on cylinder 6. It increases in severity with temperature. In the 30s it is really bad, 50s and 60s like we will have this week ease it greatly.

    My question is, is there any way to deduce whether it is a coil pack or wires? If not, should I change plugs and hope or is it much easier to go ahead and replace packs while I'm at it and what is the cost? or maybe all plugs and just the coil pack on the cylinder in question?

    Thanks in advance.

    -Ryan

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    Cadillac Cust Svc's Avatar
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    Re: Misfire - Plugs or coil pack?

    Ryan, I realize you're looking for DIY advice from owners, but I wanted to let you know I'm available to work with your dealer towards a resolution at any point. I'm happy to contact them on your behalf and follow up for you, so please email me at Katie_Lucille@gmexpert.com for further assistance. I'm so sorry to hear about your continued frustration with this concern!

    Katie
    Cadillac Customer Service

  4. #3
    beigecat's Avatar
    beigecat is offline Cadillac Owners Member
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    Re: Misfire - Plugs or coil pack?

    I'm not sure of the set up but, The easiest way DaPurple is to switch coils. Numer 6 with the another coil. If the miss follows the coil, its the coil, if it stays on number 6 cyl it may be cracked plug, injector or mechanical, but not the coil.

    Replacing the coils is expensive relative to taking out a pretty girl.

    I would go with replacing the plugs, switching the coils and go from there. Its what I would do. GOOID LUCK!

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    tinman's Avatar
    tinman is offline Cadillac Owners Connoisseur
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    Re: Misfire - Plugs or coil pack?

    Quote Originally Posted by beigecat View Post
    I'm not sure of the set up but, The easiest way DaPurple is to switch coils. Numer 6 with the another coil. If the miss follows the coil, its the coil, if it stays on number 6 cyl it may be cracked plug, injector or mechanical, but not the coil.

    Replacing the coils is expensive relative to taking out a pretty girl.

    I would go with replacing the plugs, switching the coils and go from there. Its what I would do. GOOID LUCK!
    I'd take out the pretty girl!

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    Re: Misfire - Plugs or coil pack?

    Like they said, first change all plugs, then move coils to different sides, see if the miss moves. If it does, then just a bad coil. IF it stays, then it may be an injector, swap the injectors around to the other side, if it still is there, it could be a valve spring, or valve, or bad wiring, or piston. Do a compression and leak down test on the cly, if it is still there,

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    wohpony is offline Cadillac Owners Member
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    Re: Misfire - Plugs or coil pack?

    I just had this problem on my 2009 CTS DI AWD and it ended up being the plugs. The firing order is 1-3-5 on drivers side and 2-4-6 on the left. You can start by just reseting your codes, swaping coils and seeing if the miss moves. Just remove your oil cap and pop the engine cover off then pop the plastic covers on both sides off for more room. If you have any question or want some photos just let me know.

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    exm22psu is offline Cadillac Owners Enthusiast
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    Re: Misfire - Plugs or coil pack?

    Funny because I am getting something similar. My car is missing or acting like its missing when under a load and light gas, like maintaining speed and going up a hill. I took it to the dealership and they said it's not throwing any codes. I guess it might be the plugs? It only has 55k on it and I know the plugs are supposed to be good to 100K

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    wohpony is offline Cadillac Owners Member
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    Re: Misfire - Plugs or coil pack?

    I read that on the DI engines you are lucky to get 50k out of the plugs. Mine had just under 70k.

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    DaPurpleRT is offline Cadillac Owners Fanatic
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    Re: Misfire - Plugs or coil pack?

    A few pics would be great. I may tackle this this weekend since it is going to be near 80 out.

    Thanks!

  11. #10
    wohpony is offline Cadillac Owners Member
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    Re: Misfire - Plugs or coil pack?

    Heres a few photos with the engine cover removed and one of how to disconnect the coils. I removed the Sway brace for more room.





  12. #11
    MoFex's Avatar
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    Re: Misfire - Plugs or coil pack?

    Quote Originally Posted by wohpony View Post
    I read that on the DI engines you are lucky to get 50k out of the plugs. Mine had just under 70k.
    Where did you hear it? It is an interesting information but to believe it I woul dneed evidence. That said I had a coil going bad I think at 50k or something similar. Reading this board it would appear that many people had issues with either coils or plugs.....interesting.

  13. #12
    Chris Pelkey is offline Cadillac Owners Member
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    Re: Misfire - Plugs or coil pack?

    I've got 73,500 or so on mine (DI) with the original plugs. Had a coil replaced at 68,000. Gas mileage is about 18.5 around town and up to 23+ on trips. I'd also like to know if the DI's need the plugs changed sooner than 100k.

  14. #13
    DaPurpleRT is offline Cadillac Owners Fanatic
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    Re: Misfire - Plugs or coil pack?

    Oh also, it is one plug per cylinder.coil correct? And what's our gap?

  15. #14
    wohpony is offline Cadillac Owners Member
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    Re: Misfire - Plugs or coil pack?

    Yes its one plug/coil per cylinder. I used Autolite Double Platinum plugs (P#APP5263) Gap @ .050 to replace the factory installed AC Delco Double Platinum plugs.

  16. #15
    loosend is offline Cadillac Owners Fanatic
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    Re: Misfire - Plugs or coil pack?

    Quote Originally Posted by wohpony View Post
    I just had this problem on my 2009 CTS DI AWD and it ended up being the plugs. The firing order is 1-3-5 on drivers side and 2-4-6 on the left. You can start by just reseting your codes, swaping coils and seeing if the miss moves. Just remove your oil cap and pop the engine cover off then pop the plastic covers on both sides off for more room. If you have any question or want some photos just let me know.
    Correction, the cylinder layout is 2-4-6 on the driver side and 1-3-5 on the passenger side. Firing order is 1-2-3-4-5-6.

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