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Killing power to fuel pumps solves hot start.....please help, IM STUCK !!!

posted by  TJAM2K3 on  Fri Jan 16 01:21 CST 2004
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List of work done is as follows; new intake manifold gasket, new plugs, new plug wires, new injector seals, cleaned throttle body, O2 sensor seems to be working, junkyard injectors(16), junkyard LH Jetronic computer, junkyard coil(3), junkyard distributor(3), ECT(2), junkyard fuel injector relay(6), junkyard distributor(4), junkyard cap and rotor(5), junkyard IAC(3)-I don't trust any of them 100%, junkyard air mass meter(4), junkyard fuel pressure regulator(5).

I have swapped all these things out in EVERY conceivable combination. One problem persists. If I start the car and let it run for as little as 15 seconds, it will not restart. However, if I remove the #1 fuse it will start perfectly then I have to hurry and put the fuse back in or it will die.

I have read ALL of the ringlee files. I know what is happening when I remove the fuse. I am sort of aware that there is a problem with too much fuel. My mileage is VERY low, like 10+\- MPH. The new-used injectors made the car a whole new creature, but they didn't solve the problem.

When I say the car doesn't even have to run for 15 seconds to bring on the condition, I'm hoping that will be the biggest clue for someone here on the forum. The car isn't really "hot", I mean I can just about lay my hand on the exhaust when I kill it.

Please help







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    Killing power to fuel pumps solves hot start.....please help, IM STUCK !!!

    posted by  Volvacious on  Fri Jan 16 10:48 CST 2004
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    last visit: Thu Apr 25 15:00 CST 2013
    [RELATED]

    Hey I had this same exact problem with my 87 744 na, a while back.
    I had to pull the fuse to get it to hit, it would run well without it for a while. Eventually it got to where I had to pull it, crank it, then it would start to stumble, then replace the fuse and drive.

    It turned out in my case to be a crossed wire. I'm not sure exactly what wire anymore, I'll call & try to find out. An oil change place killed my engine, replaced it and this issue. They finally took it to a dealer. Dealer swaped a wire from the injector (fuel) side with another that had been placed where it should have. Problem fixed (except that it killed my fuel relay & it had to be replaced shortly afterword).

    I'll see if I can't find out exactly what wire was switched.








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      Killing power to fuel pumps solves hot start.....please help, IM STUCK !!!

      posted by  TJAM2K3 on  Fri Jan 16 14:02 CST 2004
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      Thanks for your help. Im glad someone here has had this problem. I discovered it by accident, atleast now I can start the car when it is hot. I hope my problem is solved soon though. I'm only getting about 10 MPG.








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    Killing power to fuel pumps solves hot start.....please help, IM STUCK !!!

    posted by  runwld2 on  Fri Jan 16 06:59 CST 2004
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    last visit: Tue Sep 30 13:11 CST 2014
    [RELATED]

    I don't understand the whole story here, or maybe I missed it.
    The #1 fuse controls the fuel pump?
    If you leave in the #1 fuse, what happens?
    You start car. It stops after 15 secands or you shut it off?
    If you let it run, it goes OK?
    How long between shutting it off and it will start again?

    If the return fuel line were plugged the pressure quickly goes over 100psi, so the mixture becomes very rich. This seems unlikely as at start the pressure would be its lowest, once you put in the fuse the pump comes on and pressure would rise quickly, and stay there.

    I'd first check you have spark when it doesn't start.
    Then look for gas on the plugs.
    --
    744-16v,745-16v,242Turbo.245DLT








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      Killing power to fuel pumps solves hot start.....please help, IM STUCK !!!

      posted by  TJAM2K3 on  Fri Jan 16 09:23 CST 2004
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      I said it could run as LITTLE as 15 seconds and it gets hot enough to bring on the hot start condition, not that it only runs 15 seconds.....It runs like a dream. The problem is HOT STARTING....

      If I leave the #1 fuse in it takes 30 seconds to start and runs like crud(Too much fuel probably)

      yes I have spark when it doesnt start....








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    Killing power to fuel pumps solves hot start.....please help, IM STUCK !!!

    posted by  invar on  Fri Jan 16 01:44 CST 2004
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    last visit: Fri Feb 26 21:00 CST 2010
    [RELATED]

    hmm you're positive that FPR is working? no fuel coming out of the vacuum connection is there?
    --
    Kenric Tam
    1990 Volvo 740 base sedan (B230F)
    My Volvo 'Project'








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      Killing power to fuel pumps solves hot start.....please help, IM STUCK !!!

      posted by  TJAM2K3 on  Fri Jan 16 09:25 CST 2004
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      Out of the 5 or 6 FPRs that I have none of them have a hole in the diaphram. In fact one of them looks to have less than a few thousand miles of use.








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        Killing power to fuel pumps solves hot start.....please help, IM STUCK !!!

        posted by  invar on  Fri Jan 16 14:29 CST 2004
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        last visit: Fri Feb 26 21:00 CST 2010
        [RELATED]

        Just wanted to cover all the bases since you said it was a junker FPR. :)

        Hmm a very peculiar problem indeed...
        --
        Kenric Tam
        1990 Volvo 740 base sedan (B230F)
        My Volvo 'Project'







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