Question about coil packs for an '03 Seville
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Cadillac Seville / Cadillac Eldorado Forum Discussion, Question about coil packs for an '03 Seville in Past Cadillac Vehicle Discussion; I have a 2003 Seville STS with about 170,000 miles on it. A few months back I changed all eight ...
  1. #1
    Jamie Z is offline Cadillac Owners Fanatic
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    Question about coil packs for an '03 Seville

    I have a 2003 Seville STS with about 170,000 miles on it.

    A few months back I changed all eight spark plugs, with the correct AC Delco plugs.

    A couple of days ago the car started misfiring, and my Service Engine light would flash periodically. I got the P0300 code, Engine Misfire. I had it checked at a local auto parts place and we pinned it down to cylinder #4. I'm hoping it doesn't have anything to do with the plugs I installed.

    So... I plan to replace the front coil. I understand from reading here that the front and rear coils are exactly the same except for color. But are there other years and models which are also compatible? I was planning to run down to the local junk yard to see what I could find, but I've never seen an '03 like mine in the yard. I do see a few 2001s, especially Devilles and the like. Will a coil from another year/model fit my car?

    Jamie

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    basscatt's Avatar
    basscatt is offline Cadillac Owners Master
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    Re: Question about coil packs for an '03 Seville

    I understand from reading here
    that the front and rear coils are exactly the same except for color.

    you are CORRECT -
    the front and rear coils ARE identical -


    But are there other years and models which are also compatible?
    YES - all Northstar motors with the ignition coil cassettes use the same parts -
    whether from an Eldorado - Deville or Seville -
    any/all are interchangeable - and will work -

  4. #3
    Ranger's Avatar
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    Re: Question about coil packs for an '03 Seville

    I think in '04 GM went to a different design with replaceable coils. Not sure if those are interchangeable.

  5. #4
    Jamie Z is offline Cadillac Owners Fanatic
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    Excellent. Just what I was hoping to hear.

    I see lots of 2000 and 2001 cars in the yard, but haven't seen an '03 yet.

    Jamie

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    Ranger's Avatar
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    Re: Question about coil packs for an '03 Seville

    2000-2003 are the same.

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    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: Question about coil packs for an '03 Seville

    .............. and if you didn't exchange the plug boots or use dielectric grease in the tips of the old ones, look there - for spark tracking down the plug insulator - it looks like fine, black lightning strikes etched onto the insulator.

    Coil cassette and ignition pictures in my albums.

  8. #7
    Jamie Z is offline Cadillac Owners Fanatic
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    Re: Question about coil packs for an '03 Seville

    Quote Originally Posted by Submariner409 View Post
    .............. and if you didn't exchange the plug boots or use dielectric grease in the tips of the old ones, look there - for spark tracking down the plug insulator -
    I did not exchange the plug boots or use dialectic grease.

    Should I get new plug boots since I'm going to pull the front coil? I'm guessing that's a dealer-only part.

    Jamie

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    98cadillac is offline Cadillac Owners Fanatic
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    Re: Question about coil packs for an '03 Seville

    I believe the boots are available at Advance Auto Parts and other similar stores. I think they're about $7.50 each.

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    Re: Question about coil packs for an '03 Seville

    Boots are available at lots of places - look at a NAPA or do some online shopping. I have recently seen AC Delco (probably an aftermarket manufacturer) and Airtex for $2.10 apiece.

    Or talk to Chris in parts at Rippy Cadillac over there >>>>>>>>>>>>>>

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    Re: Question about coil packs for an '03 Seville

    Quote Originally Posted by Jamie Z View Post
    I did not exchange the plug boots or use dialectic grease.

    Should I get new plug boots since I'm going to pull the front coil? I'm guessing that's a dealer-only part.

    Jamie
    --------------------------------
    the dialectic grease is a MUST -

    clean and inspect the boots carefully -
    flex the top of the boot -
    if there are and cracks - or splits - replace them -

    and as Sub suggested - inspect them for "carbon tracking" on the outer surface -
    if you see any little "pencil lines" don't bother trying to clean them -
    it won't work - again - just replace the boot -

    when you get the used coil from the "man's mall" -
    grab the boots as well -

    rockauto.com looks like that have a real deal going on -
    a closeout on PRESTOLITE Part # 118077 -
    from the pic - it looks like a full set of 8 -
    for $10.75 plus shipping -

  12. #11
    Jamie Z is offline Cadillac Owners Fanatic
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    Re: Question about coil packs for an '03 Seville

    Thanks for all the help, guys.

    I have two more quick questions.

    I just returned form the junk yard. Found a coil pack and pulled it off. I also got all the plug boots. They charged me more than I expected for the part... but anyway.

    So... if I pull off my coil and I see cylinder #4 has signs of arcing, can I just replace that boot, with dialectic grease, and put my same coil back on and bring back the expensive used part? That is, does a misfire necessarily mean the coil is bad, or could it just be the boot?

    And finally, where the heck do I put the dialectic grease? Do I just jam some grease down each end of the plug boot? I could grease up the electrodes on the coil, but it's pretty hard to reach down and put grease on the plugs.

    Jamie

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    Re: Question about coil packs for an '03 Seville

    Using a toothpick, smear a dab of dielectric ignition grease (any parts store) into the top opening and tip opening of the boot - you're not trying to pack the boot - only to seal the first 3/8" or so of rubber sleeve.

    IF the existing boot is tracked, nothing will save it. Time for all new boots - and those boots have a stainless steel spring inside - that's the "plug wire".

    EDIT: Look closely - very closely - at your coil cassette individual secondary connectors - the ones that go into the top of the boots. In some cases the cassette plastic around the coil connector cracks = trash cassette.

  14. #13
    basscatt's Avatar
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    Re: Question about coil packs for an '03 Seville

    Quote Originally Posted by Jamie Z View Post
    Thanks for all the help, guys.

    I have two more quick questions.

    I just returned form the junk yard. Found a coil pack and pulled it off. I also got all the plug boots. They charged me more than I expected for the part... but anyway.

    So... if I pull off my coil and I see cylinder #4 has signs of arcing, can I just replace that boot, with dialectic grease, and put my same coil back on and bring back the expensive used part? That is, does a misfire necessarily mean the coil is bad, or could it just be the boot?

    And finally, where the heck do I put the dialectic grease? Do I just jam some grease down each end of the plug boot? I could grease up the electrodes on the coil, but it's pretty hard to reach down and put grease on the plugs.

    Jamie
    ----------------------
    does a misfire necessarily mean the coil is bad,
    or could it just be the boot?

    it COULD be the boot -
    it COULD be other things too -

    if I pull off my coil and I see cylinder #4 has signs of arcing,
    can I just replace that boot,

    because #4 is on the front of the engine - and easy to get to -
    I would say YES - it MIGHT be worth a try -

    HOWEVER - like Sub suggested - inspect that original coil -
    VERY - VERY closely -

    IF there was some arcing - there is a reason -
    the reason is electricity will take the path of least resistance -
    and something failed -

    either the boot is split -

    the coil spring in the boot was badly corroded -

    the coil cassette is cracked -

    or the spark plug is broken/cracked or the gap is way too big -

    the point is -
    IF there is evidence of arcing - you need to find out WHY -

    -----------

    if you don't find obvious arcing - or a split boot -
    chances are the coil itself is the cause -

    where the heck do I put the dialectic grease
    you can carefully push the coil spring in the boot out -
    I like to put a little grease on the first 1/4 inch of each end of the spring -
    that is the "contact" area -
    then also a little inside the rubber boot itself - again about 1/4 inch in -
    on each end - this just helps seal the boot to the cassette and the plug -
    and will help prevent the boot from "baking" onto the hot surface -

  15. #14
    Jamie Z is offline Cadillac Owners Fanatic
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    Re: Question about coil packs for an '03 Seville

    Finished the job. Thanks for all the help, everyone. Car is back to normal.

    Just for the record, I don't believe the coil packs between years are exactly the same. My car is an '03. I got a part of a '00 Deville (I think, I can't quite remember now, I looked at so many different cars in the yard). The junk yard wanted to charge me for both the coil and the distributor module that's in it. When I balked, she said I could bring back the module if I didn't use it, plus there was a core charge for the coil.

    So... my intention was to return the module. When I got home and pulled the coil from my car, I removed the distributor module from each coil, and though they are almost identical, they are not perfectly identical. The pins on the back of the modules were different. I should have gotten pictures, but my hands were already all greasy. It didn't appear that I'd be able to swap modules, so I left them how they were and installed the whole unit I got from the junkyard.

    I replaced all the plug boots with new ones (Napa) and used dielectric grease as recommended. For what it's worth, none of my old boots had anything I could detect as carbon tracking and the coil didn't have any marks or discoloration I could see.

    In any case, the car is back up like it should be. It cost a bit more than I anticipated, running about $90 for all the parts and a few hours work on my part, but that's better than bringing it in to a shop.

    Once again, thanks for all the help, tips, and suggestions.

    Jamie

  16. #15
    basscatt's Avatar
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    Re: Question about coil packs for an '03 Seville

    Quote Originally Posted by Jamie Z View Post
    Finished the job. Thanks for all the help, everyone. Car is back to normal.

    Just for the record, I don't believe the coil packs between years are exactly the same. The junk yard wanted to charge me for both the coil and the distributor module that's in it. When I balked, she said I could bring back the module if I didn't use it, plus there was a core charge for the coil.

    So... my intention was to return the module. When I got home and pulled the coil from my car, I removed the distributor module from each coil, and though they are almost identical, they are not perfectly identical. The pins on the back of the modules were different. I should have gotten pictures, but my hands were already all greasy. It didn't appear that I'd be able to swap modules, so I left them how they were and installed the whole unit I got from the junkyard.

    I replaced all the plug boots with new ones (Napa) and used dielectric grease as recommended. For what it's worth, none of my old boots had anything I could detect as carbon tracking and the coil didn't have any marks or discoloration I could see.

    In any case, the car is back up like it should be. It cost a bit more than I anticipated, running about $90 for all the parts and a few hours work on my part, but that's better than bringing it in to a shop.

    Once again, thanks for all the help, tips, and suggestions.

    Jamie
    ------------------------
    I don't believe the coil packs between years are exactly the same
    if it is a coil cassette from a Northstar motor -
    functionally - they are all the same -

    same with the ICM - they too - are all the same -

    she said I could bring back the module if I didn't use it,
    plus there was a core charge for the coil.

    WOW - I NEVER heard of a junk yard charging a core on a coil -
    and yes - if you paid more than $35 for the coil with the ICM -
    you overpaid - but it was still a LOT cheaper than new -

    $90 would probably just about cover the diagnostics -
    THEN you start getting charged for parts and labor -

    you did good -

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