1990 DeVille idles rough

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Northstar Engines and System Technical Discussion Discussion, 1990 DeVille idles rough in Cadillac Engine Discussion; Title says it all. When firing her up for the first time of the day, ususally she idles rough and ...
  1. #1
    patricko's Avatar
    patricko is offline Cadillac Owners Member
    Automobile(s): 1990 Cadillac DeVille
    Join Date
    Mar 2013

    1990 DeVille idles rough

    Title says it all.

    When firing her up for the first time of the day, ususally she idles rough and struggles to accelerate. Lasts for about 30 minutes then runs smooth.

    Anyone have this issue? or know good ways to diagnose it?

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
    Automobile(s): White Diamond '03 DHS (with DTS floor shift)
    Join Date
    Jun 2004
    Woodstock Ill.

    Re: 1990 DeVille idles rough

    Sounds a lot like a vacuum leak.

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