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Thread: 2004 Deville-High Idle Speed, No Codes. Dealer cant figure it out...........

  1. #16
    hearseman's Avatar
    hearseman is offline Cadillac Owners Fanatic
    Automobile(s): 2004 DeVille Hearse
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    Re: 2004 Deville-High Idle Speed, No Codes. Dealer cant figure it out...........

    Yes, I cleaned the TB and idle air valve a couple of days ago. I did a much better cleaning of it while I had the intake off today.


  2. #17
    Manic Mechanic is offline Cadillac Owners Fanatic
    Automobile(s): 2001 DeVille
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    Re: 2004 Deville-High Idle Speed, No Codes. Dealer cant figure it out...........

    Your friends Tech II will show you the desired idle. Your previously "normal" lower idle speeds seem low to me, can anyone else say that their engines idle that low as a normal condition? I don't know for sure, but I know mine and any that I've worked on where I was looking were idling higher than that. IMHO it's more likely that your engine had problems maintaining adequate idle speed before and you grew to accept that as normal. Just speculating, you'll have to compare desired idle to actual to know for sure.

    Vernon

  3. #18
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
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    Re: 2004 Deville-High Idle Speed, No Codes. Dealer cant figure it out...........

    Quote Originally Posted by Manic Mechanic View Post
    Your friends Tech II will show you the desired idle. Your previously "normal" lower idle speeds seem low to me, can anyone else say that their engines idle that low as a normal condition?
    FWIW, Mine idles at factory spec of 650 (warm).

  4. #19
    Manic Mechanic is offline Cadillac Owners Fanatic
    Automobile(s): 2001 DeVille
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    Re: 2004 Deville-High Idle Speed, No Codes. Dealer cant figure it out...........

    I just can't recall anything idling at 500 normally.

    Vernon

  5. #20
    Ian-STS99 is offline Cadillac Owners Fanatic
    Automobile(s): 2005 Deville Limited Edition
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    Re: 2004 Deville-High Idle Speed, No Codes. Dealer cant figure it out...........

    My 05 Deville idles at 625 / 650 most of the time, but I have seen it idle as high as 675 (these are in Park / Neutral readings). Not sure why it idles as high as 675, I've checked everything under the hood to see if there is a leak in the air intake and fuel line, but found nothing.

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