Unexplainable DeVille Problems

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Cadillac DeVille 1985 to 2005 including:
1985-1992 Fleetwood, 1993 Sixty Special, All FWD Forum Discussion, Unexplainable DeVille Problems in Past Cadillac Vehicle Discussion; Hello Once Again, I had posted earlier about my "93 DeVille and the problem's I've been having, some of you ...
  1. #1
    rbnj is offline Cadillac Owners Member
    Join Date
    Sep 2003

    Unexplainable DeVille Problems

    Hello Once Again, I had posted earlier about my "93 DeVille and the problem's I've been having, some of you have answered and I thank you, but as of today the car has been in the shop for a week this is also the 2nd. mechanic and no one can identify the problem. The problem started with a rough idle anytime I used anything electrical in the car. All major components have been changed, plug's wire's fuel filter , air filter, etc. The computer was changed, this didnt help, all wire's going to the computer have been tested, all ground's have been tested, all good.The car starts up fine but the longer you drive it the engine starts to run rough and miss and backfire. If I turn on the lights it idle's even rougher if you turn the lights off it goes back to a smoother idle but that idle is still rough. Like I said no one can find the problem, my mechanic said he is totally baffled. The onboard computer does not kick out any bad code's at all. The vacum line has been checked, the cap and rotor check out fine, the throttle body is good, the intake manifold gasket has been checked, all check out fine. I purchased this car a year ago with 62,000 miles on it and it has been running great up until 3 weeks ago when all this started to happen it seem's right out of no where. Anyone have any idea's or suggestion's? Thank's Russ

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  3. #2
    the Sandman's Avatar
    the Sandman is offline ...Reloaded
    Automobile(s): '05 XLR
    Join Date
    Jan 2003
    Tampa, FL
    Battery, cables, alternator...everything checks out with the charging system?

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