missing, LT1
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5.0 and 5.7 Discussion, missing, LT1 in Cadillac Engine Technical Discussion; Hi i just changed my waterpump, plugs, pcv, fuel filter, oil, egr valve and u joints. Now the car misfires ...
  1. #1
    Hammondsix's Avatar
    Hammondsix is offline Cadillac Owners Fanatic
    Automobile(s): Cadillac Fleetwood 94
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    missing, LT1

    Hi i just changed my waterpump, plugs, pcv, fuel filter, oil, egr valve and u joints.

    Now the car misfires on one cylinder on the passenger side, its intermittent. Im thinking that it is only a wire since its only on one cylinder, but my fear is that it could be the opti.

    What do you guys think?


    thanks alot
    --------------------
    94 Fleetwood, w 124k miles and full service history

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  3. #2
    79caddy1's Avatar
    79caddy1 is offline Cadillac Owners Member
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    Re: missing, LT1

    Did this start doing it when you were done doing that work?....or is this why you changed the plugs?

    mine was doing that, due to a bad plug wire. Although, I changed the plugs too, after I figured it out.....

  4. #3
    BCs71's Avatar
    BCs71 is offline Cadillac Owners Enthusiast
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    Re: missing, LT1

    I'd definitely guess a wire. The looms that hold the wires underneath the exhaust manfolds are sharp and metallic. Perfect place for arcing.

    But you just changed the plugs? Gap is correct? What brand (some are cheap, stock Delcos are NOT cheap)??? Did you perhaps crack a plug during installation by accident? Maybe crossed plug wires accidentally?
    I'd double check a few of the above things.

    If you get a sray bottle of water and spritz the wires at nighttime you may be able to see some arcing if wire is frayed....

  5. #4
    79caddy1's Avatar
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    Re: missing, LT1

    Your right, I didn't think of a crossed wire during plug install....

    And yes, I bought cheapie plugs once....Only Once!

  6. #5
    Hammondsix's Avatar
    Hammondsix is offline Cadillac Owners Fanatic
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    Thread Starter

    Re: missing, LT1

    figured it out, i cracked one of the plugs. i doesnt run smoother with the new (bosch) plugs though...

  7. #6
    BCs71's Avatar
    BCs71 is offline Cadillac Owners Enthusiast
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    Re: missing, LT1

    Quote Originally Posted by Hammondsix View Post
    figured it out, i cracked one of the plugs. i doesnt run smoother with the new (bosch) plugs though...

    I would skip the Bosch and go with stock AC Delcos that came with the car. They hurt the pocketbook at $5 each but are worth it. Good for about 100K miles of driving and really are the best plug for stock LT1 vehicles (i.e., no NOS or superchargers).

  8. #7
    N0DIH's Avatar
    N0DIH is offline Cadillac Owners Master
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    Re: missing, LT1

    Dual Platiunum Autolights are also worthy, but that is it. They AC Delco and the Autolights are very similar in construction and materials.

  9. #8
    RobDeville is offline Cadillac Owners Member
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    Re: missing, LT1

    Has anyone heard how hammond has made out?

  10. #9
    kevinf is offline Cadillac Owners Member
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    Re: missing, LT1

    I would guess it's arcing as well. Let the car idle with the hood up, if you hear a "clicking" that's probably it. You might even be able to see the arc jump.

  11. #10
    bigbluebrougham's Avatar
    bigbluebrougham is offline Cadillac Owners Fanatic
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    Re: missing, LT1

    Quote Originally Posted by Hammondsix View Post
    figured it out, i cracked one of the plugs. i doesnt run smoother with the new (bosch) plugs though...
    Mine runs great with the Bosch ones. At least for now... I replaced my wires with lifetime belden wires from NAPA at the same time too.

  12. #11
    Hammondsix's Avatar
    Hammondsix is offline Cadillac Owners Fanatic
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    Thread Starter

    Re: missing, LT1

    The car runs ok with the cheapo bosch plugs, but not better than before. i guess the old ones didnt need changed.

    thanks

  13. #12
    Gwokable is offline Cadillac Owners Fanatic
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    Re: missing, LT1

    My reccomendation: Ac Delco Rapidfires

    I'v installed them into a number of cars from different manufacturers and they always result into a respectable performance boost.

    Return the Bosch and tell them they actually reduced your HP.

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