1990 DeVille, 4.5l engine issues

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HT4100 4.1, 4.5, 4.9 Discussion, 1990 DeVille, 4.5l engine issues in Cadillac Engine Technical Discussion; Very stressful return home yesterday. I was about 150 miles away from home driving down the highway when the engine ...
  1. #1
    caddynewby is offline Cadillac Owners Member
    Automobile(s): 1990 Fleetwood
    Join Date
    Mar 2010
    Montreal, Canada

    1990 DeVille, 4.5l engine issues

    Very stressful return home yesterday. I was about 150 miles away from home driving down the highway when the engine started behaving strangely, there seemed to be short interruptions of power and any extra throttle input would cut engine power altogether, at some point the engine wouldn't take enough throttle to sustain 60 mph, I had to pull over. It was fairly hot outside, maybe 85 deg F, the tank was almost full and the only way to work around the problem was to stop the car for a few minutes and start again, it was good for another 20 miles until the same symptoms gradually reappeared until pulling over was mandatory.

    The car has about 50,000 miles and is in good shape, I get no error code on the dashboard. I had decided to take the car to the mechanic the next morning but after sitting all night it worked normally again, I couldn't replicate the symptoms I had encountered the previous day. It could be that the problem appears only on long highway drives, which I seldom do frankly.

    Could it be a fuel pressure issue? I wanted to have that checked, but when the car works fine I doubt anything would come out of a fuel pressure test.

    Any ideas appreciated.

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  3. #2
    HUF's Avatar
    HUF is offline Cadillac Owners Connoisseur
    Automobile(s): 1995 FWB 100,*** miles CURRENT. 1991 Seville 175,000 SOLD
    Join Date
    Dec 2005

    Re: 1990 DeVille, 4.5l engine issues

    It helps to tape the fuel gauge to the windshield to see the data when the car is acting up. That should be done safely. It can be quite distractive as well. Safety first.

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