what is that god awful smell
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HT4100 4.1, 4.5, 4.9 Discussion, what is that god awful smell in Cadillac Engine Technical Discussion; what is that damn smell, ive got a 94 deville 4.9 141,xxx miles and when idling strong fumes come from ...
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    madcad04 is offline Cadillac Owners Member
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    what is that god awful smell

    what is that damn smell, ive got a 94 deville 4.9 141,xxx miles and when idling strong fumes come from exhust what in the hell is causing this, someone help before i die...

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    tacoma's Avatar
    tacoma is offline Cadillac Owners Fanatic
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    Re: what is that god awful smell

    Quote Originally Posted by madcad04 View Post
    what is that damn smell, ive got a 94 deville 4.9 141,xxx miles and when idling strong fumes come from exhust what in the hell is causing this, someone help before i die...
    if it smells like rotten eggs chances are its your catalytic converter

  4. #3
    awadecki is offline Cadillac Owners Enthusiast
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    Re: what is that god awful smell

    Your car may be running rich because of a dead injector or bad/sticky fuel pressure regulator. Try spraying WD-40 into the FPR nipple by removing the vacuum hose. Then, put it back on and then blip the throttle about 10 times. Take it around the block and see if that helps.

  5. #4
    Cadillacon22s's Avatar
    Cadillacon22s is offline Cadillac Owners Fanatic
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    Re: what is that god awful smell

    The rotton smell is definately your catalytic converter.

  6. #5
    madcad04 is offline Cadillac Owners Member
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    Re: what is that god awful smell

    its not a rotten smell just strong exhust fumes and gas smell

  7. #6
    awadecki is offline Cadillac Owners Enthusiast
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    Re: what is that god awful smell

    See my tip...this happened to my 91 Deville and it was a bad FPR and one bad injector.

  8. #7
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    Re: what is that god awful smell

    ^^^explain fpr and the process im not great with cars but ill try anything and my 95 smells heavy on the exhaust end aswell

  9. #8
    awadecki is offline Cadillac Owners Enthusiast
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    Re: what is that god awful smell

    Remove the vacuum hose from the FPR, then simply spray a lot of WD-40 in there. Put the hose back on and start the car up. Blip the throttle about 10 times and take it for a drive. You can repeat the procedure too without harm.

  10. #9
    CaddyshackCadillac's Avatar
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    Re: what is that god awful smell

    could it also be from running 87 octane instead of the premium?

  11. #10
    MitchMeister- is offline Cadillac Owners Member
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    Re: what is that god awful smell

    uh... as far as i know not running premium in a 4.9L is a bad idea, the motor is set to use the higher octane IE: timing and such... and with lower octane you'll get more detonation = bad.

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