1993 STS Rough Idle
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Northstar Engines and System Technical Discussion Discussion, 1993 STS Rough Idle in Cadillac Engine Technical Discussion; My 1993 Seville STS has a rough idle when warmed up. PCV???...
  1. #1
    harryc's Avatar
    harryc is offline Cadillac Owners Member
    Automobile(s): 1993 Seville STS
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    1993 STS Rough Idle

    My 1993 Seville STS has a rough idle when warmed up. PCV???

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  3. #2
    eldorado1 is offline Cadillac Owners Connoisseur
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    Re: 1993 STS Rough Idle

    Could be anything. Start with a general tune up. Spark plugs, wires, etc.

  4. #3
    Eldyfig's Avatar
    Eldyfig is offline Cadillac Owners Connoisseur
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    Re: 1993 STS Rough Idle

    PCV valve is cheap. It should be part of your tune up. Like eldorado1 said, could be alot of things. Any othe problems or more detail?

    Welcome to the forum.

  5. #4
    harryc's Avatar
    harryc is offline Cadillac Owners Member
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    Re: 1993 STS Rough Idle

    At 114,000 miles what all does a tune-up entailed?

  6. #5
    Ranger's Avatar
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    Re: 1993 STS Rough Idle

    Plugs and wires.

  7. #6
    dkozloski's Avatar
    dkozloski is offline Cadillac Owners 10000+ Posts
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    Re: 1993 STS Rough Idle

    Save yourself a lot of grief and use OEM Delco parts.

  8. #7
    mcowden is offline Cadillac Owners Connoisseur
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    Re: 1993 STS Rough Idle

    Quote Originally Posted by dkozloski
    Save yourself a lot of grief and use OEM Delco parts.
    Amen. AC-Delco 41-950 plugs and AC-Delco 628Q wire set for your car. The PCV valve is AC-Delco CV774C at about $2.50. Altogether you can get everything for about $150 delivered to your house from www.rockauto.com. Those parts were designed, tested, and made for your car. They'll cost you a few bucks more, but they are known to work well for a long time. Let us know what you do and how it turns out, and welcome to the forum...
    Mike

  9. #8
    harryc's Avatar
    harryc is offline Cadillac Owners Member
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    Smile Re: 1993 STS Rough Idle

    Many thanks for the much needed info and for your friendly treatment. I will do as you advise and let you know how it turns out.

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