01 Deville Cylinder #1 misfire - Page 2
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Northstar Engines and System Technical Discussion Discussion, 01 Deville Cylinder #1 misfire in Cadillac Engine Technical Discussion; ........ and have you continued your resistance checks to the entire fuel injector wiring harness/connectors ?...
  1. #16
    Submariner409's Avatar
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    Re: 01 Deville Cylinder #1 misfire

    ........ and have you continued your resistance checks to the entire fuel injector wiring harness/connectors ?

  2. #17
    StephanBlake is offline Cadillac Owners Member
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    Re: 01 Deville Cylinder #1 misfire

    P0300 -engine misfire.

    no spark / incorrect firing time Cylinder 1 constant misfire

    New crankshaft position sensors. Both were re-learned yesterday and camshaft aswell.

    And injectors are fine and working.

    So now im wondering if this SOB jumped time? I highly doubt it but it could be possible.

  3. #18
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    Re: 01 Deville Cylinder #1 misfire

    You replaced the PCM, does the 01 have one ICM or 1 for each bank?? If one I'd say it was bad.
    The only thing even remotely close was this post(diff year) that mentions the problem was a poor connection at ICM.
    http://www.cadillacforums.com/forums...-pack-s-2.html

    See post 17. apparently the pins were collapsed a little and not making contact. might be worth a look.
    Good luck.

  4. #19
    ewill3rd is offline Cadillac Technician
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    Re: 01 Deville Cylinder #1 misfire

    Are the injector codes gone?
    If the misfire is steady on cylinder 1 swap the coil packs from bank to bank and see if you get a different cylinder misfire.

  5. #20
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    Re: 01 Deville Cylinder #1 misfire

    2000 - late 2003 Northstar has two (identical) ICMs - one in each coil cassette L-leg.

    Each is removable with 2 screws and 2 plastic snap tangs. Careful - and each ICM has a seal ring and connector at the cassette itself.
    StephanBlake likes this.

  6. #21
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    Re: 01 Deville Cylinder #1 misfire

    Quote Originally Posted by StephanBlake View Post

    So now im wondering if this SOB jumped time? I highly doubt it but it could be possible.
    Highly unlikely.

  7. #22
    StephanBlake is offline Cadillac Owners Member
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    Re: 01 Deville Cylinder #1 misfire

    Well basic run down is i swapped packs misfire stayed in cylinder 1. even got a coil pack from the junk yard and still no difference. it is only a single misfire and not a whole bank. injector codes gone, just very stumped. i used a meter to measure voltage coming from pcm to coils and all checked out fine. ohmed out the coil packs aswell and all checks out fine.

  8. #23
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    Re: 01 Deville Cylinder #1 misfire

    Swap/ Replace injector number one..........

  9. #24
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    Re: 01 Deville Cylinder #1 misfire

    If you have the skills, try swapping more components, swap 2 of the injectors, swap some spark plugs....swap one thing at a time and recheck. When the miss moves, you have found your problem. If you can't find the issue this way you may have a mechanical issue.

  10. #25
    StephanBlake is offline Cadillac Owners Member
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    Re: 01 Deville Cylinder #1 misfire

    Well as I said before I pulled out injector #1 and tested it myself. Fully functional and not plugged up....

    @ ewill3rd in the beginning of my post i have already done that.

  11. #26
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    Re: 01 Deville Cylinder #1 misfire

    It may not be spraying enough fuel.

    Yes, it's functioning but if the spray pattern isn't correct or enough isn't being injected, it could lead to a problem.

    The only way to KNOW for sure is to have it flow tested.

    To have an isolated problem in one cylinder like that is ironic. You have compression, the plugs should be gapped correctly. You have swapped coils, yes, the injector is firing, but is it enough? Possibly questionable. The only thing that is going to be left is a burnt exhaust valve, but that will affect compression to some degree.

    Swap another injector......

  12. #27
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    Re: 01 Deville Cylinder #1 misfire

    Sorry I missed that earlier. If you have swapped the injector, the spark plug and the coils and you have a misfire on number 1 that won't move then you most likely have one of two issues. I would have to look at the schematics but depending on how the coils are triggered there could be a wiring issue for the #1 coil control circuit or you have a mechanical problem. Pardon my ADD but I think you said you ran a compression check? Another question is, you know that cylinder 1 is on the rear bank right?

  13. #28
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    Re: 01 Deville Cylinder #1 misfire

    yes cylinder 1 is rear left if you're in front of the car, near the coolant fill tank. Considering I had the PCM reprogrammed, wouldnt the dealer have noticed that during the reprogramming? Also on my first post i did and ohms test on the coils and a voltage test to pcm from coil connector harness, and all seemed fine and i compared to the front. Does anyone know if you can pull the coil out still plugged in ground the spring in the middle of coil to car and turn over key to see if any plugs are sparking???? or do i need to have plugs near metal to get it to spark? Id really would like to try it to see if the #1 is sparking...... im guessing its going to be near impossible because the boots have springs in them and it may be hard to keep plugs in boots and on coil properly so no spark can escape where its not supposed to. I also have the old coil i can temporarily hook up so i do not have to tear off rear coil.

  14. #29
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    Re: 01 Deville Cylinder #1 misfire

    If you swapped the coil cassettes from front to rear that eliminates the coils. Ohm testing is entirely worthless on a coil. Oh it can identify a truly bad one but I won't identify a marginal one that fails under load. If you really want to do some testing for spark you can get some lengths of 7/32" vacuum hose and use them as "plug wires" They will fit on the tips of the coils and the carbon content is high enough but you have to be careful because if you touch them and you touch the car you will be carrying the spark energy through your body. You would need to have a ground for the coil housing to the engine, a wire with some clips on it should work fine. If all your tests were done properly you could have a mechanical condition like a valve guide, spring, lifter, or seat issue. I would try doing a leak down test if you can get your hands on the proper equipment. If you have your compression tester you could try a running compression test but it will be very hard with that ignition system.

  15. #30
    StephanBlake is offline Cadillac Owners Member
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    Re: 01 Deville Cylinder #1 misfire

    UPDATE what are the odds that the new coil pack i got was bad??????? I returned it and got another one and problem solved!!!! Im so relieved. I feel like a new cadillac owner!! Thanks for everyone that looked into this for me as i greatly appreciated the info and help.

    P.S. while I was installing the new coil cassette, my key fob was in my pocket and i hit the panic button and about had a freaking heat attack!! i had to sit down for a sec to bring my pulse down lol.

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