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Thread: Eldorado fluctuating idle on drive

  1. #1
    rickrobles's Avatar
    rickrobles is offline Cadillac Owners Member
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    Eldorado fluctuating idle on drive

    Hi, I have a 99 Eldorado with 100,xxx miles had the headgasket repair done by Midwest Cadillac at 98,xxx miles.

    Been driving like a dream up until two weeks ago. When stopped at a light on drive the car will start shaking. Does not do it neutral or park could it be the TPS?


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  3. #2
    sts 03's Avatar
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    Could be or a number of other things.try cleaning your tb and iac first.is your engine light on and have you checked for codes?

  4. #3
    rickrobles's Avatar
    rickrobles is offline Cadillac Owners Member
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    Re: Eldorado fluctuating idle on drive

    No engine light, I will check codes this afternoon.

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    sts 03's Avatar
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    How long had it been since you cleaned the tb and iac?

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    rickrobles's Avatar
    rickrobles is offline Cadillac Owners Member
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    Re: Eldorado fluctuating idle on drive

    Do you have to remove the sensors to clean them?

  7. #6
    sts 03's Avatar
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    To clean the iac there are two bolts (Philips head) to clean the throttle body just un clamp the air intake after the maf.when cleaning the iac just clean the end/plunger and the bore where the iac goes.submariner has pics in his album with the location of iac .

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    rducote is offline Cadillac Owners Member
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    Re: Eldorado fluctuating idle on drive

    Quote Originally Posted by sts 03 View Post
    Could be or a number of other things.try cleaning your tb and iac first.is your engine light on and have you checked for codes?
    This is spot on. Before you do anything else, clean the throttle body.

  9. #8
    sts 03's Avatar
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    Could tps also .does it do it while driving or at idle?

  10. #9
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    Re: Eldorado fluctuating idle on drive

    There is a tutorial in the Tech Tips section on TB cleaning. Yours may vary slightly, but the basics are the same.

  11. #10
    rickrobles's Avatar
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    Re: Eldorado fluctuating idle on drive

    Quote Originally Posted by sts 03 View Post
    Could tps also .does it do it while driving or at idle?
    Does it only on idle and only in drive, its smooth on all other gears.

  12. #11
    sts 03's Avatar
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    Yeah I would clean the tb and iac first then go from there.yeah there is a tutorial in tech tips for cleaning both , you don't even have to do a lot of scrolling.type in on the search bar in this site and it might Pop up faster.

  13. #12
    rickrobles's Avatar
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    Re: Eldorado fluctuating idle on drive

    Update: I cleaned the throttle and iac. Put some techron fuel system by chevron cleaner and filled up the tank. Ran like a dream all week. I filled up Friday afternoon and again the symptoms started all over again. So I decided what the hell I'm going to drop another bottle of techron in the tank. And symptoms stopped again.

    Any idea what it could be? I always pump 93 octane and the car is religiously maintained.

  14. #13
    rickrobles's Avatar
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    Re: Eldorado fluctuating idle on drive

    Any ideas? Anyone any feedback is appreciated?

  15. #14
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    Did you ever pul the codes?


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