spark plug change - 1999 Eldorado
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Cadillac Seville / Cadillac Eldorado Forum Discussion, spark plug change - 1999 Eldorado in Past Cadillac Vehicle Discussion; Hello to all! I bought my first Cadillac Eldorado a 1999, 90,000 miles. I am trying to change the spark ...
  1. #1
    rbcoats is offline Cadillac Owners Member
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    spark plug change - 1999 Eldorado

    Hello to all! I bought my first Cadillac Eldorado a 1999, 90,000 miles. I am trying to change the spark plugs and have got the 5 easiest ones done. My question is how do I change the last 3 plugs that are on the back of the engine under Neath the coil pack?

    EDIT by Moderator: Proper vehicle model year.

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    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: spark plug change



    With great difficulty and several bandages. It's been a while. That's all I remember.

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    98Geldog is offline Cadillac Owners Fanatic
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    I bought a long spark plug socket with extension attach to it from autozone or orileys that makes changing the plugs a 15 minute job

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    Re: spark plug change

    Quote Originally Posted by rbcoats View Post
    Hello to all! I bought my first Cadillac Eldorado a 1990, 90,000 miles. I am trying to change the spark plugs and have got the 5 easiest ones done. My question is how do I change the last 3 plugs that are on the back of the engine under Neath the coil pack?
    Doesn't this car have a distributor?

    If 1990 was a typo and it is a Northstar, unbolt & lift the coilpack.

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    Ranger's Avatar
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    Re: spark plug change

    ^^^^ Good point. I missed that and assumed it to be a 4.9.

  7. #6
    MoistCabbage's Avatar
    MoistCabbage is online now Cadillac Owners 10000+ Posts
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    Disconnect the torque struts, and put a turnbuckle in ones place to pull the engine forward slightly.

    Not much sense spending R&D money making it slightly easier to access something that only needs to be serviced every ~50K (copper plugs)-100K miles (platinum plugs).

    Now try doing plugs on a V10 van .

  8. #7
    98cadillac is offline Cadillac Owners Fanatic
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    Re: spark plug change

    The rear spark plugs on the Northstar aren't that hard to get to. Not quite as easy as the front, but not too bad.
    vincentm likes this.

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    rbcoats is offline Cadillac Owners Member
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    Re: spark plug change

    sorry for the mistake, the year is 1999.

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    Re: spark plug change

    rb, While you are doing the right (rear) bank of spark plugs, also remove the coils and ICM for a good contact/connector cleaning. Also check the integrity of the ICM ground wire.

    There are two pre-2000 spark plug wiring diagrams (it's important) in my albums. The Community tab ^^^, Albums, the red Seville - 2 albums, 6 pages.

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    Re: spark plug change - 1999 Eldorado

    Ahh, so it was a typo. In that case, it's easy. I never used a turnbuckle. Just removed the strut tower brace (if so equipped) as well as the ICM (with coils and wires still attached). Be advised that there is a hidden mounting bolt on the back side of the ICM that requires the Braille method to remove and install. After that it's fairly easy access. MUCH easier than the 4.9.
    vincentm likes this.

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    Re: spark plug change - 1999 Eldorado

    Rear plugs are easy, only frustrating part is not having a plug socket that isn't magnetic, and the plugs drop back in after loosening them.. >.<

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    98cadillac is offline Cadillac Owners Fanatic
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    Re: spark plug change - 1999 Eldorado

    The plugs are held by the rubber part of the spark plug socket I use so thankfully they don't drop back in for me.

  14. #13
    vincentm's Avatar
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    Re: spark plug change - 1999 Eldorado

    Yea, my dad taught me to loosen the plug then use the boot of the wire to pull it out. old mechanics trick

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    Re: spark plug change - 1999 Eldorado

    A 6-12" length of heater hose works very well to remove and reinstall them.

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