Engine miss
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Northstar Engines and System Technical Discussion Discussion, Engine miss in Cadillac Engine Technical Discussion; I have just done a HG on my N*. Everything seems to be OK. The engine was out of balance, ...
  1. #1
    jholland is offline Cadillac Owners Member
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    Engine miss

    I have just done a HG on my N*. Everything seems to be OK. The engine was out of balance, but I wouldn't call it missing when I first started driving it. Each time I drive it it seems to get better. The milage is 23.5. I put in new plugs. I looked at the front bank and if anything they are burning a little lean. I will ocassionally stumble at idle and when it is lugging on a hill. The tac will also occasionally jump around but there is no noticeable affect on the engine when the tac is irratic. Before the HG job the coil paks seemed to be making a clattering noise, that is gone now, the only differnce on the ignition side is new AC plugs. I'm sure the next logical move is plug wires and coil paks. Any advice on the how to diagnose this further.

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Engine miss

    Mist the wires in a dark place at night and look for a light show. I'd suspect the wires before coils, especially if they are original and the fuel rail recall has been done. Seems to be a common problem afterwards.

  4. #3
    GreenMachine's Avatar
    GreenMachine is offline Cadillac Owners Fanatic
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    Re: Engine miss

    Also if you have a Multimeter you can check the wires for proper resistance, I believe its 15K OHms or similar.

  5. #4
    jholland is offline Cadillac Owners Member
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    Re: Engine miss

    The fuel rail was recently done. I had the codes read last night. Current codes are P0441,P1370,P1375 and P1376.

    P0441 - Evaporative Emission Control System Incorrect Purge Flow
    P1350 - Ignition Control System
    P1375 - IC 24X Reference Circuit High Voltage
    P1376 - Ignition Ground Circuit

  6. #5
    jholland is offline Cadillac Owners Member
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    Re: Engine miss

    I sprayed the plug wires at night and didn't get a lightshow. I replaced the plug wires anyway. It runs better but far from correct. Is there any way to test the coils?

  7. #6
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: Engine miss

    Listen for arcing with a stethescope, pull then and look at the contacts for signs of arcing or what I think is the best way, swap them out one at a time with a known good one from another car.

  8. #7
    jholland is offline Cadillac Owners Member
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    Re: Engine miss

    Thanks, I will have a car available tomorrow.

  9. #8
    clarkz71's Avatar
    clarkz71 is offline Cadillac Owners Connoisseur
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    Re: Engine miss

    Quote Originally Posted by jholland View Post


    P1376 - Ignition Ground Circuit
    Did you re-install the ground cable that goes from the head to the coil/module bracket?

  10. #9
    jholland is offline Cadillac Owners Member
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    Re: Engine miss

    Yes. Asside from the engine misfiring badly the tach was randomly jumping around. I added a 12 ga. wire from the ignition module to the strut tower and the erratic tach completely went away. I can't get the engine to body ground wire off to clean it. The stud is too rusted. I'm soaking it for a while rather than risk breaking it. The clattering sound I refered to in the earlier post was the PCV valve. Just replaced it and the split rubber boot connected to it. I can here noise in the coil area. When the engine is cold or running at highway speed the engine is almost smooth, under load there isn't much power. I just ordered a complete used ignition module with coils. It is supposed to be off a wrecked 95 car. For 50 bucks its worth a shot.

  11. #10
    jholland is offline Cadillac Owners Member
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    Re: Engine miss

    Installed the ignition module and the engine miss is gone. The coils that came of the car don't appear to be OEM.

  12. #11
    clarkz71's Avatar
    clarkz71 is offline Cadillac Owners Connoisseur
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    Re: Engine miss

    Glad you got it fixed.

  13. #12
    dp102288's Avatar
    dp102288 is offline Cadillac Owners Connoisseur
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    Re: Engine miss

    Congrats.

  14. #13
    tccadieldo is offline Cadillac Owners Member
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    Re: Engine miss

    Another trick that I think it was Ranger taught me, is to just trade your existing coil packs around and check for spark loss and it will tell you what coil pack is bad. The one that is bad will be the one that has no spark no mattter where you install it. Another thing, you can see if the contact area is dry of grease between the mounting plates.

  15. #14
    bjmobile is offline Cadillac Owners Member
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    Re: Engine miss

    informative. thread bookmarked.

  16. #15
    97EldoCoupe is offline U.S. Patent #8,740,532 - www.studkit.com
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    Re: Engine miss

    People are paying $50 for used ICM's and coil packs? Wow I'll have to sell my collection soon

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