99 sts running rough after warms up
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Cadillac Seville / Cadillac Eldorado Forum Discussion, 99 sts running rough after warms up in Past Cadillac Vehicle Discussion; My neighbor just bought a 99 sts after it gets to normal operating temp starts running rough and the rpms ...
  1. #1
    bk001981 is offline Cadillac Owners Member
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    99 sts running rough after warms up

    My neighbor just bought a 99 sts after it gets to normal operating temp starts running rough and the rpms start surging, i did a search and it looks like it could be the icm but he swapped that already to no avail. any other suggestions? Thanks in advance, Bill

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  3. #2
    rodnok01's Avatar
    rodnok01 is online now Cadillac Owners Connoisseur
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    Pull the codes... post with defiitions & current or history.
    There is a sticky on how to do it.
    Throwing parts at a Caddy is the first wrong thing to do.

  4. #3
    bk001981 is offline Cadillac Owners Member
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    Quote Originally Posted by rodnok01
    Pull the codes... post with defiitions & current or history.
    There is a sticky on how to do it.
    Throwing parts at a Caddy is the first wrong thing to do.
    Thanks I did pull the codes, and accidentally cleared them, I only pulled the PCM codes though, I will pull the rest and get back to to u, I do know It had a random cylinder misfire, and I do know he said he had new plugs put in it, the codes I pulled were P0155 and P0440 both current, there were a few history codes but as I mistakenly cleared them I don't know what they were

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    rodnok01's Avatar
    rodnok01 is online now Cadillac Owners Connoisseur
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    What plugs did he have put in? If not ac delco spec that'd be first thing to fix.

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 99 sts running rough after warms up

    There is a link in the DTC Sticky at the top of the forum that has code definitions.

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