2003 deville starts then immediately dies.
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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, 2003 deville starts then immediately dies. in Past Cadillac Vehicle Discussion; I hadn't started my car for only 2 days then today I had this happen. It started fine then died ...
  1. #1
    purelux is offline Cadillac Owners Fanatic
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    I hadn't started my car for only 2 days then today I had this happen. It started fine then died instantly, tried again same would stay running with foot on gas. Let off gas died, tried again kept at about 1200 or so for a few minutes stayed running but 450 ac on-500 off. After driving it slowly increased idle each stop light I hit until back to 625-650 like normal. Only code was rim u1016 history. However voltage normally is 15 today it showed 14.8 then slowly over 20 or so minutes down to 14.3. Drove again 3 hrs later and went 14.9-14.5. Any ideas I've had a IAC go bad or stick, battery and alternators go bad but nothing like this???

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    MoistCabbage's Avatar
    MoistCabbage is offline Cadillac Owners 10000+ Posts
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    When was the TB last cleaned.

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    Ranger's Avatar
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    Re: 2003 deville starts then immediately dies.

    I put my money on a dirty TB before the IAC valve. The IAC bypass channel is probably carboned closed.

  5. #4
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    Submariner409 is offline If it won't run, stick on fender vents
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    Re: 2003 deville starts then immediately dies.

    Your indicated system voltages are correct. Indicated voltage will be 12.2 to 12.5 volts with key on, then it goes high just after start as the alternator/regulator jams amps back into the battery at elevated voltage. As internal battery resistance (state of charge) rises, the charging rate ramps down to a constant 14.2 to 14.5 voltage with only enough amperage to handle the exiting electrical loads.

    The poor idle quality and stalls should not be battery/system related with your stated voltage sequence. 2003 Deville ??? I'll also advise TB and IAC cleaning.

    For alternator/regulator operation, look into www.balmar.net. For lead-acid battery theory and charging, Google "lead acid battery charging" or any of the leading battery manufacturer websites and read the tech articles. www.rollsbattery.com

  6. #5
    purelux is offline Cadillac Owners Fanatic
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    Tb and iac were cleaned maybe 2 or 3 months ago. Though ill check/clean again soon as weather cooperates.

  7. #6
    Ranger's Avatar
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    Re: 2003 deville starts then immediately dies.

    In that case it may be a failed IAC valve, but I would expect that to set a DTC.

  8. #7
    RippyPartsDept's Avatar
    RippyPartsDept is offline Hi, I'm Chris - Please Read My Signature
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    Re: 2003 deville starts then immediately dies.

    is the check engine light on?
    if so, pull the codes...
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    Ranger's Avatar
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    Re: 2003 deville starts then immediately dies.

    I suspect the light must be on with P1599-stall or near stall detected..............duh!

  10. #9
    RippyPartsDept's Avatar
    RippyPartsDept is offline Hi, I'm Chris - Please Read My Signature
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    Re: 2003 deville starts then immediately dies.

    yeah... but what else? maybe some of the history codes might help also
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    Re: 2003 deville starts then immediately dies.

    Maybe Chris.

    P.S.
    The "duh" was aimed at the code definition, not you. Hope yo didn't take it that way. Didn't think about it til I just reread it.

  12. #11
    RippyPartsDept's Avatar
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    Re: 2003 deville starts then immediately dies.

    ah... yeah i wasn't really sure... figured i knew you better than to assume the worst
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  13. #12
    purelux is offline Cadillac Owners Fanatic
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    Sorry forgot to post, definition is serial communications malfunction.

  14. #13
    Ranger's Avatar
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    Re: 2003 deville starts then immediately dies.

    Quote Originally Posted by RippyPartsDept View Post
    ah... yeah i wasn't really sure... figured i knew you better than to assume the worst
    Thanks Chris, I appreciate the vote of confidence.

  15. #14
    simdude85 is offline Cadillac Owners Member
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    I have an 02 that had the same problem. I replaced the iac and she is back working like new

  16. #15
    bigtone's Avatar
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    Re: 2003 deville starts then immediately dies.

    My 01 Deville failed the same way. Start, but instant stall. New IAC fixed it.

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