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Cadillac Seville / Cadillac Eldorado Forum Discussion, 2000 SLS running rough in Past Cadillac Vehicle Discussion; Originally Posted by Caddy 4 Life ok the ONLY CODE comming up is P0300. I have NO!!!!!!!!!!!!!!! vac leak . ...
  1. #16
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2000 SLS running rough

    Quote Originally Posted by Caddy 4 Life View Post
    ok the ONLY CODE comming up is P0300. I have NO!!!!!!!!!!!!!!! vac leak.
    OK, I'll do your homework for you: Your earlier code - P 0443 - refers to an EVAP system fault. The EVAP emissions system - which controls fuel vapor emissions from the fuel tank - uses manifold vacuum to purge a charcoal canister located under the frame rail under the LR passenger door sill area. ANY leak in that system or its solenoid is a vacuum leak that would affect low speed and idle engine performance ....... EVAP is normally actuated for fixed periods when at a steady highway speed. The EVAP control solenoid on your engine sticks out the right (rear) side of the throttlebody and has an electrical connector and the EVAP purge hose connected to it. If something is wrong with that solenoid you have a vacuum leak.
    Caddy 4 Life likes this.

  2. #17
    Caddy 4 Life is offline Cadillac Owners Member
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    Re: 2000 SLS running rough

    ok so i had gone to autozone and cylinder 2 is not firing. so instead of changing the entire coil pack i changed the icm. turns out the coil for cylinder 2 is bad so i have to change the whole coil pack. the newer northstars have separate coils for each cylinder but still has the same icm wire connecter. would i be able to use the newer style on my 2000 SLS or should i just replace with same?

  3. #18
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2000 SLS running rough

    No - 2000 - early 2004 use the 4-coil cassette with ICM on the L-leg. Period

    Junkyard - and the color makes no difference - the cassettes are the same, the ICMs are the same.

    Pictures and diagrams in my albums - click my username, open the profile. Left column, 2 albums - 6 pages of stuff for your car/engine.

    or, look for a DELPHI sale in RockAuto.

    In any event, replace the boots also. Carbon tracking will flat positively short out a plug - 100% misfire. You might find some oil on the plug insulators - normal. Not to worry.
    Attached Images

  4. #19
    Caddy 4 Life is offline Cadillac Owners Member
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    Re: 2000 SLS running rough

    tx for info. how do i guarantee i get a good 1 from junkyard?

  5. #20
    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    You don't really. But failure is not common, and most salvage yards will let you swap it for another one if it doesn't work.

  6. #21
    Caddy 4 Life is offline Cadillac Owners Member
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    Re: 2000 SLS running rough

    true info. i just went today, paid 35 and if it dont work i can swap.

  7. #22
    Caddy 4 Life is offline Cadillac Owners Member
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    Re: 2000 SLS running rough

    ok so i replaced the front coil pack and the mis fire is gone but now i have the catalytic converter p0420 is comming up. my idle rpm is about 550 to 600. is there a reason for this?

  8. #23
    basscatt's Avatar
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    Re: 2000 SLS running rough

    Quote Originally Posted by Caddy 4 Life View Post
    ok so i replaced the front coil pack and the mis fire is gone but now i have the catalytic converter p0420 is comming up. my idle rpm is about 550 to 600. is there a reason for this?
    ------------------
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  9. #24
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    Re: 2000 SLS running rough

    Usually P0420 means that the CAT is going bad.

  10. #25
    Caddy 4 Life is offline Cadillac Owners Member
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    Re: 2000 SLS running rough

    what would cause my rpm to b at 550 to 600

  11. #26
    Ranger's Avatar
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    Re: 2000 SLS running rough

    Dirty TB?
    Clogged IAC air passages?
    Malfunctioning IAC valve?

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