2000 STS idling rough
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  • 2 Post By Ranger
Cadillac Seville / Cadillac Eldorado Forum Discussion, 2000 STS idling rough in Past Cadillac Vehicle Discussion; I have a 2000 Seville sts 4.6 I keep getting a misfire #7 code I've swapped plugs,wires,injectors,coil packs and I'm ...
  1. #1
    stealth92 is offline Cadillac Owners Member
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    2000 STS idling rough

    I have a 2000 Seville sts 4.6 I keep getting a misfire #7 code I've swapped plugs,wires,injectors,coil packs and I'm still getting code for misfire any suggestions would be greatly appreciated thanks

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  3. #2
    curtc's Avatar
    curtc is online now OCD - Obsessive Cadillac Disorder
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    Re: 2000 seville idling rough

    You'd have better luck in the Seville section of CF, this is the 05+ STS area...totally different.
    Past Cadillac's

    2004 CTS 3.6L - 2011-2012
    2001 Seville Touring Sedan - 2006-2011
    1995 Seville Touring Sedan - 2005-2006

  4. #3
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2000 seville idling rough

    Bump !! and move to the proper Seville forum .........

  5. #4
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: 2000 seville idling rough

    Quote Originally Posted by stealth92 View Post
    I have a 2000 Seville sts 4.6 I keep getting a misfire #7 code I've swapped plugs,wires,injectors,coil packs and I'm still getting code for misfire
    There are no wires. How'd you do that?

    When was the TB last cleaned?
    98cadillac and 98cadillac like this.

  6. #5
    lorain is offline Cadillac Owners Member
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    Re: 2000 seville idling rough

    No wires? Is it coil over plug? I'd swap the coil pack with another and see if the misfire changes location.

  7. #6
    Ranger's Avatar
    Ranger is online now Cadillac Owners Member
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    Re: 2000 seville idling rough

    Yes. GM went to COP ignition on the Northstar in 2000.

  8. #7
    Buster28 is offline Cadillac Owners Member
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    Re: 2000 seville idling rough

    I have observed that on the GM service website and my 2000 FSM there are no OBDII single cylinder misfire codes (P0301-P0308) applicable to 2000-2003 (LD8) and (L37) engines, the only misfire code is P0300, so I am not certain how a #7 misfire DTC is being set.

    There are no individual coils packs on 2000-2003 LD8/L37 engines, they are in a cassette consisting of 4 coils each. The front and rear cassettes are interchangeable but without single cylinder misfire detection you still don't know where the problem is.

  9. #8
    Submariner409's Avatar
    Submariner409 is offline If it won't run, chrome it
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    Re: 2000 STS idling rough

    Many aftermarket and parts dealer scan tools will give a definite cylinder misfire readout - "P 0302 C" or "P 0307 H".

    That little ICM uses a (don't quote me) 14 or 18 pin connector.

    More pictures of all this in my albums.

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