Trouble Shooting
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HT4100 4.1, 4.5, 4.9 Discussion, Trouble Shooting in Cadillac Engine Technical Discussion; Hey folks, I need some help in trouble shooting a problem with my Eldorado. When cool it runs fine except ...
  1. #1
    ElDiablo83 is offline Cadillac Owners Member
    Join Date
    Aug 2003
    Location
    Pelham, AL
    Age
    59
    Posts
    11

    Question Trouble Shooting

    Hey folks, I need some help in trouble shooting a problem with my Eldorado. When cool it runs fine except for the sluggish performance however after a few hours of running around town, mixed interstate and surface street driving, it starts hesitating severly and becoming harder to start and keep running. This apparently is a thermal kind of thing since it is worse as the day warms up. Where should I begin searching to try to clear this up? Also I am looking for suggestions as to what resource information ( repair manuals, etc.) that I should have on hand to address things that I can work on at home versus those requiring professional attention. Thanks, Kerry

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  3. #2
    B. Fitzgerald is offline Cadillac Owners Member
    Join Date
    Sep 2003
    Location
    Thornton, CO
    Posts
    14

    Re: Trouble Shooting

    Quote Originally Posted by ElDiablo83
    Hey folks, I need some help in trouble shooting a problem with my Eldorado. When cool it runs fine except for the sluggish performance however after a few hours of running around town, mixed interstate and surface street driving, it starts hesitating severly and becoming harder to start and keep running. This apparently is a thermal kind of thing since it is worse as the day warms up. Where should I begin searching to try to clear this up? Also I am looking for suggestions as to what resource information ( repair manuals, etc.) that I should have on hand to address things that I can work on at home versus those requiring professional attention. Thanks, Kerry

    I would try to hook up with a scanner and read the data that the computer is seeing. It is the easiest way to see if the O2 sensor is doing it's job. You can also do it with a DVOM or Lab Scope. I'm going to assume you don't have any of these so if you haven't replaced the O2 sensor in the last 30,000 miles, that would be my first try.

    It also sounds like a good candidate for a Motorvac treatment.

    Good Luck. bf

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