Cadillac
 

Cadillac Forums | Help Us Help You | Advertise | Cadillac Parts | Cadillac News | Cadillac Classifieds

Cadillac Technical Archive | Cadillac Dealers | Cadillac Reviews | Cadillac Dealer Reviews | Cadillac Vendors

Results 1 to 5 of 5

Thread: 5.0 skip... Out of luck?

  1. #1
    Faded Crest's Avatar
    Faded Crest is offline Cadillac Owners Connoisseur
    Automobile(s): '66 SDV, '76 CDV, '76 FWB, '78 CDV, '89 BRM, '91 BRM '92 BRM, '98 Concours, '00 SDV
    Join Date
    Apr 2008
    Location
    North Carolina
    Age
    45
    Posts
    3,179

    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?


  2. Remove Advertisements
    CadillacForums.com
    Advertisements
     

  3. #2
    Faded Crest's Avatar
    Faded Crest is offline Cadillac Owners Connoisseur
    Automobile(s): '66 SDV, '76 CDV, '76 FWB, '78 CDV, '89 BRM, '91 BRM '92 BRM, '98 Concours, '00 SDV
    Join Date
    Apr 2008
    Location
    North Carolina
    Age
    45
    Posts
    3,179

    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
    Automobile(s): 1999 BMW 740 Il. 2005 Jag XK8, 1988 Mercedes Benz 300 SE
    Join Date
    Feb 2003
    Location
    california
    Age
    69
    Posts
    6,688

    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): '66 SDV, '76 CDV, '76 FWB, '78 CDV, '89 BRM, '91 BRM '92 BRM, '98 Concours, '00 SDV
    Join Date
    Apr 2008
    Location
    North Carolina
    Age
    45
    Posts
    3,179

    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
    Automobile(s): 94 Fleetwood Brougham
    Join Date
    Aug 2004
    Location
    Rockford, IL
    Age
    50
    Posts
    7,531

    Re: 5.0 skip... Out of luck?

    Sweet!!!


Bookmarks

Cadillac Posting Rules

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Read about Lincoln | Buick | Kia Forte Forum