01 Deville Cylinder #1 misfire
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Northstar Engines and System Technical Discussion Discussion, 01 Deville Cylinder #1 misfire in Cadillac Engine Technical Discussion; Ok went to work one day car was running fine, got done with my shift at work hopped in my ...
  1. #1
    StephanBlake is offline Cadillac Owners Member
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    01 Deville Cylinder #1 misfire

    Ok went to work one day car was running fine, got done with my shift at work hopped in my car started it up and i was running rough...... So i swapped out plugs with new ac delco plugs, still a misfire. secondly i got new coil packs still misfiring. Finally OBD Found codes as follows.

    p0107 map
    p0201 cyl #1 injection problem
    p0202 2 " "
    p0203 3 " "
    p0204 4 " "
    p0205 5 " "
    p0206 6 " "
    p0300 random misfire
    p0335 CKP sensor "A" problem
    p0340 CMP sensor problem
    p0385 CKP sensor "B" problem

    Now at home with my ohm meter........

    Ohm tested all 8 injectors were within ballpark of 12.5 ohms no less.
    I also verified that there was 12volts to injectors (with car running)

    ohm tested the ICM in the rear from left to right there are 7 probes
    and got the following results...

    1) 1.600 ohms
    2) 002.7 ohms
    3) 20.5 ohms
    4) 20.5 ohms
    5) 20.7 ohms
    6) 20.7 ohms
    7) 20.9 ohms

    Front ICM going right to left

    1) O.L
    2) 000.0 ohms
    3) 35.7 ohms
    4) 35.8 ohms
    5) 35.8 ohms
    6) 35.9 ohms
    7) 35.9 ohms

    Different ohms ? O.L on 1? in the front ICM?

    I cannot test the harness going to ICM's because I have noone to turn over car for me. Is it even worth a shot?

    Also I did the old school stethiscope trick with a screw driver to listen for the click of the injectors and all seem to be clicking.
    then i decided to pull the harness going to injector 1 and it did not intensify just stayed the same. i pulled the one next to it and idle got worse so my guestimation would be either #1 a clogged injector? or no spark in cylinder 1#
    Now I am clueless to what to do now.

    Could it be the Engine control module / PCM?

    Not 100% positive i checked these the right way but i assume i was correct. Any help would be greatly appreciated. Thanks, Stephan.

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  3. #2
    StephanBlake is offline Cadillac Owners Member
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    Re: 01 Deville Cylinder #1 misfire

    Any help? Please and thanks.

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, stick on fender vents
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    Re: 01 Deville Cylinder #1 misfire

    Hang in there - I'll move this from the PCM Tuning (as in: Modification) forum to the Northstar diagnosis forum.

  5. #4
    ternstes is offline Cadillac Owners Fanatic
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    Re: 01 Deville Cylinder #1 misfire

    Your crankshaft position sensors are malfunctioning causing the computer to not know when to inject fuel, ignite spark, etc. Check for faulty wiring first (the wiring runs behind the front exhaust manifold. make sure it isn't burnt from improper routing). If the wiring checks out, replace the sensors. If your camshaft sensor code is still present after the crankshaft sensor change, check to see if it is plugged in and the wiring is good to it. If it is, replace that sensor as well.

  6. #5
    StephanBlake is offline Cadillac Owners Member
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    Re: 01 Deville Cylinder #1 misfire

    ok well I will have to update later on as I do not have the funds to cover the parts at this time. Thanks for the help I will update as soon as possible.

  7. #6
    StephanBlake is offline Cadillac Owners Member
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    Re: 01 Deville Cylinder #1 misfire

    OK so i did a compression test all cylinders are 120 psi. Took out #1 injector and thats clean as a whistle. So when i did a compression check sparkplug # 1 seems clean and saoked in fuel. So I assume no spark in #1. Checked all leads going to injector,coil pack wiring harnesses and lines coming from PCM. So now all I am left with is crankshaft position sensors. Would faulty crankshaft position sensors cause only cylinder #1 to misfire???

  8. #7
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 01 Deville Cylinder #1 misfire

    Would faulty crankshaft position sensors cause only cylinder #1 to misfire???
    No.

    Did you verify that you had spark to #1? Might be a bad plug, wire or coil.

  9. #8
    StephanBlake is offline Cadillac Owners Member
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    Re: 01 Deville Cylinder #1 misfire

    swapped out coils with new. new plugs. wiring is intact. ohmed out coils and injectors, tested voltage to injectors and coils. Literally stumped.It couldnt be PCM because voltage to coils seem within spec.

  10. #9
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: 01 Deville Cylinder #1 misfire

    Have you changed the crankshaft position sensors yet?

  11. #10
    StephanBlake is offline Cadillac Owners Member
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    Re: 01 Deville Cylinder #1 misfire

    not yet because I have a plan. I am going to local junk yard to pick up a used pcm to be reprogrammed to my car tomorrow morning. I just stumbled across a similar post on here thaty seems to be my problem. here is the link

    http://www.cadillacforums.com/forums...nders-5-a.html

    So before I buy 2 new crankshaft sensors im gonna give this a shot. Both sensors were bad well before this problem occured. I just never looked into how to change them in the past. As of lately i seen how easily it is to change. So if the PCM doesnt fix it im going for the crank sensors. They do need changed though, this i know. I will update @ around 9 pm on 12/2.

    Also i did forget to mention the this misfire is constant from idle to acceleration all the way to shutdown. I think if it was a bad cranksensor I would notice "fluctuation" in misfire and other cylinders.

  12. #11
    98eldo32v's Avatar
    98eldo32v is offline Cadillac Owners Connoisseur
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    Re: 01 Deville Cylinder #1 misfire

    I saw that post you mentioned.

    Good luck with it........

  13. #12
    StephanBlake is offline Cadillac Owners Member
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    Re: 01 Deville Cylinder #1 misfire

    Wasnt able to get the PCM today :/. Also the dealership I called wants 90 to reprogram. So I will update on 12/5/13. Thats my next payday.

  14. #13
    StephanBlake is offline Cadillac Owners Member
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    so I decided to go ahead and replace the crankshaft position sensors. Still no difference in misfire but it does seem to be running a lot better then it did so injectors should be firing at the appropriate time now. Tomorrow morning I'm going to a GM dealership in going to have this computer I got from the junkyard reprogrammed. So I will update tomorrow as soon as possible

  15. #14
    StephanBlake is offline Cadillac Owners Member
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    Re: 01 Deville Cylinder #1 misfire

    PCM reprogrammed and no change in engine misfire......... very disappointed right now. End of the road.

  16. #15
    ternstes is offline Cadillac Owners Fanatic
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    What DTCs do you still have current?


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