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  • #1

    BP not starting HELP ASAP

    So I just got plates on the car and replaced the throttle body. I took it around the block and it went ok, parked it for a little bit, then went to take it out again it wouldn't start, It will start for a second then quit.I try to give it more gas but it will not respond. I pulled out the fuel pump real quick and it does work. Anyone have an idea what the problem would be?

    video of whats happening:
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    Tommy

    WannaBimmer Build in Progress:
    http://www.fordfestiva.com/forums/sh...-Festiva-Build
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  • #2
    check the VAF, it will fire and die if it isn't plugged in right just like it's doing in your vid.

    Edit - just wanted to say it could be a lot of other things too, but that's a good place to start.
    Last edited by skeeters_keeper; 04-29-2015, 06:35 PM.
    ~Nate

    the keeper of a wonderful lil car, Skeeter.

    Current cars:
    91L "Skeeter" 170k, Aspire brakes, G15, BP, Advancedynamics coil overs, etc. My first love.
    1990 Kawasaki Ninja 250 - my gas saver, 60+mpg - 40k
    2004 MotoGuzzi Breva - my "longer range" bike - 17k

    FOTY 2008 winner!

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    • #3
      NO beans over there. Any other ideas?
      Last edited by Fecomatter; 04-29-2015, 06:40 PM.
      Tommy

      WannaBimmer Build in Progress:
      http://www.fordfestiva.com/forums/sh...-Festiva-Build

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      • #4
        Actually, just UNPlugged the vaf then the car ran. Is it bad?
        Tommy

        WannaBimmer Build in Progress:
        http://www.fordfestiva.com/forums/sh...-Festiva-Build

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        • #5
          VAF is necessary for fuel pump relay to supply power to electric fuel pump.
          No VAF = no fuel pump relay = no electric fuel pump = no gas = no go anywhere

          The fuel pump relay is normally open. It closes when cranking the engine and the VAF hasn't grounded just yet. After the starter disengages and the engine is running, the VAF supplies the ground to the fuel pump relay. If the engine stops, the VAF opens and the fuel pump relay opens, cutting power to the fuel pump.
          Last edited by bravekozak; 04-29-2015, 07:42 PM.

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          • #6
            So I think my intake fell apart and the air was getting in the engine without going through the vaf. I had it unplugged and it ran. Plugged it back it then it ran....
            Tommy

            WannaBimmer Build in Progress:
            http://www.fordfestiva.com/forums/sh...-Festiva-Build

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            • #7
              Originally posted by bravekozak View Post
              VAF is necessary for fuel pump relay to supply power to electric fuel pump.
              No VAF = no fuel pump relay = no electric fuel pump = no gas = no go anywhere

              The fuel pump relay is normally open. It closes when cranking the engine and the VAF hasn't grounded just yet. After the starter disengages and the engine is running, the VAF supplies the ground to the fuel pump relay. If the engine stops, the VAF opens and the fuel pump relay opens, cutting power to the fuel pump.
              quoted for posterity
              1991 Beastiva L BP autoX'er

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