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Thread: intermittent Code - Coil Group 2

  1. #16
    basscatt's Avatar
    basscatt is offline Cadillac Owners 10000+ Posts
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    Re: intermittent Code - Coil Group 2

    Quote Originally Posted by Yaemish View Post
    But if I did both, wouldn't it just tell me that the cassette or ICM was bad. Is my logic correct that by swapping just the ICMs, it would tell me if the ICM is bad or if the entire cassette is bad?
    ----------------------------------------
    the problem is almost never the ICM -
    compared to the coil -

    but - without a TECHII tool - this is how diagnostics works -
    it is pure grunt-work -

    swap the coils -

    if the problem follows the coil -
    THEN swap the ICM's -
    just to be sure the problem is NOT the ICM's -


  2. #17
    Yaemish is online now Cadillac Owners Connoisseur
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    Re: intermittent Code - Coil Group 2

    It has been coming and going with this problem, when I remove, clean , and replace the cassette I sometimes have a real hard idle and misfire. I can smell the eggs. I went and got a used cassette/ICM. At $60, it was worth it to get both parts. I just put it in and it is setting of P0300 current, I can feel the hard misfire.

    I doubt I put another bad cassette/ICM combo. I'm at 130K, I changed my plugs at 98K. At that time, the boots were fine so I left them. Last week, before I put in the replacement cassette; I took out all the plugs and boots. I cleaned the springs in the boots with electrical cleaner. One plug had a lot of oil on it. I hate throwing money at it and guessing. Should I just replace 4 plugs though?

  3. #18
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: intermittent Code - Coil Group 2

    If the plugs (look at the white insulator carefully) are carbon tracked - black lines down the sides - then they and the boots are useless and need to be replaced. New GM boots come with dielectric ignition grease in the tips, but check - and use a tad in the tip of each boot. In tubes at any parts store. Look carefully at the coil cassette secondary tower - the spark plug connector that slips into the boot tops - if the cassette material around that plug connector tip is cracked, the cassette is useless.

    Replace all 8 boots - and a bit of oil on the outside of a plug is fairly normal - from the cam cover plug well O-ring seal weeps.

    I assume the engine is the 2002, and the plugs are AC Delco #41-987 Platinum.

    EDIT: Are you still getting the P 1360 Coil group 2 control circuit code ? That's ICM, wiring, or PCM territory and needs a diagnostic tree test sequence out of the GM service manual.

  4. #19
    Yaemish is online now Cadillac Owners Connoisseur
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    Re: intermittent Code - Coil Group 2

    So I took a look at the replacement cassette, cracks around all 4 are cracked. My original one did not have that problem. I also swapped out the ICM in mine with the one that was in with the bad replacement cassette (it wasn't screwed in, I bet someone replaced it thinking it would fix the broken cassette). Anyways, I picked up some new boots and changed out the 4 front plugs while I had it open.

    One of those things fixed it. On the plus side, the computer's real time MPG is much, much higher than it has been lately.

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