4.9L 91 Seville power loss... at a loss..
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HT4100 4.1, 4.5, 4.9 Discussion, 4.9L 91 Seville power loss... at a loss.. in Cadillac Engine Technical Discussion; My 91 Seville lost practically all power the other day, and I am at a loss as to what is ...
  1. #1
    spazzcdnm is offline Cadillac Owners Member
    Automobile(s): 91' Seville
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    4.9L 91 Seville power loss... at a loss..

    My 91 Seville lost practically all power the other day, and I am at a loss as to what is wrong with it. It has the 4.9 L V8 in it. I was driving up a hill and it felt like the gas pedal gave way. Suddenly I felt like i was coasting despite the engine still running. I was able to limp home, but it seems like there is hardly any power coming from the engine. I would give it gas, and it would rev, but hardly react. It idles much more rough than before, and when you give it some gas it will backfire. There is more of a distinct noise coming from the engine on the passenger side closer to the drivers compartment. Kind of a rattle/rumble. Not a knock.

    I know its not a head gasket. I wouldnt think it could be timing since it is set with a chain. My only thoughts now are there is something wrong on the inside, or there is a vacuum issue, or something with the intake.

    Any thoughts are greatly appreciated.

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  3. #2
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 4.9L 91 Seville power loss... at a loss..



    and when you give it some gas it will backfire.
    Timing chain may have jumped a tooth (worn gear). How many miles on it?

  4. #3
    spazzcdnm is offline Cadillac Owners Member
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    Thread Starter

    Re: 4.9L 91 Seville power loss... at a loss..

    Quote Originally Posted by Ranger View Post



    Timing chain may have jumped a tooth (worn gear). How many miles on it?
    It has 184k on it.

  5. #4
    spazzcdnm is offline Cadillac Owners Member
    Automobile(s): 91' Seville
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    Re: 4.9L 91 Seville power loss... at a loss..

    So after doing some diggin I found the answer to my problem! The fuse for the left bank of fuel injectors had blown! got that swapped out and it runs great again. Now obviously there is something that caused that to occur, but that will be a different project. Just though I would post the solution. Thanks Ranger for your input!

  6. #5
    Ranger's Avatar
    Ranger is offline Cadillac Owners Member
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    Re: 4.9L 91 Seville power loss... at a loss..

    That was a much cheaper and easier fix. Sometimes fuses just go from age.

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