Advice/Help Please -- Goodyear Gave Up
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HT4100 4.1, 4.5, 4.9 Discussion, Advice/Help Please -- Goodyear Gave Up in Cadillac Engine Technical Discussion; I have a 1989 Eldorado with a 4.5L and 93,000 miles. The car runs well at start up until it ...
  1. #1
    Darrin is offline Cadillac Owners Member
    Automobile(s): Cadillac
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    Advice/Help Please -- Goodyear Gave Up

    I have a 1989 Eldorado with a 4.5L and 93,000 miles. The car runs well at start up until it reaches a certain temperature then it will run rough until it is fully warmed, at which time it runs fine again. During the rough warm up it sputters, misses and is pretty miserable. The rough running period seems to coincide with a slight decreasein voltage to below 12 volts. The spark plugs are new as is the Idle Control Motor. Goodyear tried a new alternator and a new battery, checked grounds and computer codes. They can find the problem and are giving up. Any ideas?

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  3. #2
    behind-bars is offline Cadillac Owners Connoisseur
    Automobile(s): 93 Sedan Deville 4.9L
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    Re: Advice/Help Please -- Goodyear Gave Up

    The good at idle and bad at warm temp sounds like egr issues.

    Check any for broken vacuum lines, Clean the EGR tubes beneath the throttle body, and maybe look into a new solenoid.

    If you search egr thier are procedures here on how to test and isolate the problem. If that is that is the problem

  4. #3
    Raze's Avatar
    Raze is offline Cadillac Owners Enthusiast
    Automobile(s): 90 Eldo -SOLD-, 98 ETC -SOLD-, 86 XR4Ti Track Car, 07 Ranger
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    Re: Advice/Help Please -- Goodyear Gave Up

    Check your charging system, below 12V sounds low...

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