Help with and '89 Deville w/4.5L
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HT4100 4.1, 4.5, 4.9 Discussion, Help with and '89 Deville w/4.5L in Cadillac Engine Technical Discussion; Ok, I took this car out of a 3 year storgage about 3 months ago. I have replaced the battery, ...
  1. #1
    cadi197 is offline Cadillac Owners Fanatic
    Join Date
    Oct 2003
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    Springfield, Illinois
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    37
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    Help with and '89 Deville w/4.5L

    Ok, I took this car out of a 3 year storgage about 3 months ago. I have replaced the battery, changed the oil and aired up the tires and the car was running ok. I was having a prob with the ISC when I put it up for storage and I replaced that and adjusted it so now it idles good and no more pulsating of the gas pedal. I just put new Delco plugs, wires, cap and rotor on and the car has new fuel injectors. My prob now is I am still only averaging 14.1 mpg and the car seems kinda sluggish when pushing the gas. Also I have been noticing a strong "unburned" fuel smell, especially after being on the highway or getting off. The car has 133,xxx miles and I am not sure of the maintence of this vehicle. This was my gramps car and I inherited it back in '02. I am thinking that either my O2 sensor is giving bad readings which is causing the car to run extremely rich which can cause the probs or possibly a clogged converter which would cause the sluggishness. Anyone have any ideas of where to start?......Thanks.

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  3. #2
    awadecki is offline Cadillac Owners Enthusiast
    Automobile(s): 76 Eldo (54k), 76 Eldo (52k), 78 Eldo (9k), 85 Deville (43k)
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    Re: Help with and '89 Deville w/4.5L

    Replace the 02 sensor and check your fuel pressure. Sometimes the fuel pressure regulators will stick after time causing your car to run rich.

  4. #3
    cadi197 is offline Cadillac Owners Fanatic
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    Oct 2003
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    Springfield, Illinois
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    Re: Help with and '89 Deville w/4.5L

    Thanks. I am going to replace the O2 sensor later this afternoon if it stops raining and will disconnect the battery. I will also check the fuel pressure. I didn't think of that. Thanks.

  5. #4
    chubbyranger is offline Cadillac Owners Connoisseur
    Automobile(s): 99 Seville STS, 08 STS4 N* 1SG F55
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    Re: Help with and '89 Deville w/4.5L

    Run diagnostics and pull the codes.

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