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Replacing bad parts=Runs worse

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by mountainexplorer, Dec 3, 2002.

  1. mountainexplorer

    mountainexplorer 1/2 ton status

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    Location:
    Spokane, Wa./Ione, Wa
    I just took a Holley carb off a 454 motor, since it wasnt running right. I put on an Edelbrock which ran PERFECT on another 454 I had.

    When I first started it with the Edelbrock on, all it did was backfire and shoot flames up. Eventually I got it to run and idle. It didnt seem to change much, and it still had a dead spot in it. So, I looked at the plugs, which looked very worn. So I replaced the plugs.

    Now, it dies all the time. It still pops back through the carb, and when I try to drive it, all it does is sputter, hesitate, and lack power. It ran better with the junk plugs and Holley carb that needed a rebuild.

    I hate it when replacing bad parts with good ones makes something run worse! /forums/images/graemlins/angryfire.gif I cant even drive it now. /forums/images/graemlins/angryfire.gif
     
  2. driney

    driney 1/2 ton status Premium Member

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    Does this motor have a centrifigal advance in the distributer? Sound like mine did when the weights rusted up and were stuck in the advanced position.
     
  3. mountainexplorer

    mountainexplorer 1/2 ton status

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    It's an old points distributor (1973) that looks to have an electronic conversion. There are wires coming out from the base of the cap.
     
  4. imiceman44

    imiceman44 1 ton status

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    Your problem is in the distributor.
    You said you took the carb off an other 454 that was running good, swap that distributor out and see what happens.
    /forums/images/graemlins/thumb.gif
     

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