Deville 94 4.9 issue

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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Deville 94 4.9 issue in Past Cadillac Vehicle Discussion; My deville 2 days ago started to run like weird!! on park, it run ok but on drive (or reverse) ...
  1. #1
    stephanebedard is offline Cadillac Owners Member
    Automobile(s): deville sedan 1994 4.9L
    Join Date
    Jul 2013

    Deville 94 4.9 issue

    My deville 2 days ago started to run like weird!! on park, it run ok but on drive (or reverse) when giving some throttle, its starting shuddering, its hard to describe it gives some hit at throttle, and i have no trouble code, i checked fuel pressure it its ok, spark plug are ok , vaccum looks ok i dont know about injector, i currently have no live trouble code but has p044 p046 in historic thanks for your help!

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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: Deville 94 4.9 issue

    How do you know the spark plugs are OK? Sounds to me like it might be time for a tuneup and that would include plugs, wires, cap & rotor.

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