5.0 skip... Out of luck?
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5.0 and 5.7 Discussion, 5.0 skip... Out of luck? in Cadillac Engine Technical Discussion; Hello bretheren, Bought a 1991 Brougham D'Elegance from an old geyser who did nothing but drive and change the oil. ...
  1. #1
    Faded Crest's Avatar
    Faded Crest is offline Cadillac Owners Connoisseur
    Automobile(s): '00 SDV, '94 & '99 Eldo, '03 DHS, '66 SDV
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    5.0 skip... Out of luck?

    Hello bretheren,

    Bought a 1991 Brougham D'Elegance from an old geyser who did nothing but drive and change the oil. At 119,950 miles, the spark plugs were ORIGINAL, as were the AC Delco Cap/Rotor and numbered Packard Bell spark plug wires... Have a look at one of the spark plugs. Burned down from .035 to .055.

    http://imgs.inkfrog.com/pix/thejumpsuitman/100_8998.jpg

    The car had a little bit of a rough idle, so I naturally figured that a tune up would fix it, no go...

    So I drove 100 miles into the country with some Lucas Injector cleaner and 93 Octane in it, giving it a WOT whenever possible, no change, not even any black or brown coming out of the tailpipe.

    Then someone in the Brougham/RWD thread suggested it may be an EGR valve, so I replaced that, no change.

    Obviously, I am worried that I may be looking at a burnt valve. I didn't figure in that kind of work when I bought it, so I am looking for wisdom...

    Could it be anything else? Basically, it is a very slight, but consistent miss. There is a small exhaust leak toward the front, probably on top of the catalytic converter, or where it connects. The miss is only noticeable when just rolling to a stop. You can feel a pulsating flutter. But on the road, she screams! One of the strongest TBI 5.0's I have driven (I've had 3).

    If it is a burn valve, dare I drizzle some water down the throttlebody in an effort to break it up?

    Thoughts, anyone?

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  3. #2
    Faded Crest's Avatar
    Faded Crest is offline Cadillac Owners Connoisseur
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    Re: 5.0 skip... Out of luck?

    In case the link doesn't work, here is a picture of that spark plug...



    Here's a picture of the car...


  4. #3
    carnut is offline Cadillac Owners Master
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    Re: 5.0 skip... Out of luck?

    Go back to the basics. Run a compression test first. Then hook a vacuum gauge to it and report back what you get.

  5. #4
    Faded Crest's Avatar
    Faded Crest is offline Cadillac Owners Connoisseur
    Automobile(s): '00 SDV, '94 & '99 Eldo, '03 DHS, '66 SDV
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    Re: 5.0 skip... Out of luck?

    Problem solved... It was either the MAP sensor or a vaccuum line in that area. I replaced it, secured the hoses in the area, and now it runs PERFECT!

  6. #5
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master
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    Re: 5.0 skip... Out of luck?

    Sweet!!!

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