Question about 1991 Ford Mustang

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So, I just bought this car that had a 2.3L motor swapped out before, and a 5.0L put in. Not a hack job, done by Ford, and confirmed it was proper by Ford, I have some sticker on the rad. Anyways.... The car will start, crank over twice, and fire until its hot. Once it gets warm she dies, and takes for ever to start unless you let it cool off. The alternator isnt in top condition, but even with a battery charger hooked up it will still die, so it cant be the injectors losing power and getting it again. It is almost like it runs out of fuel, and than sparks and shoots up the rpms again, but with the fuel pressure gauge on her she runs 35-45psi strong. Im puzzled... any helpers? I Have tried: a new MAF (Mass Air Flow Sensor) a newTPS (Throttle Positioning Sensor) a newComplete Distributor and Moduel Switching out coils same thing changing Intake manifold and plenum gasket

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  • oh_youtouchm Oct 05, 2010

    Okay, so new fuel pump which is a performance one thats designed for these 302s and works on 5.8L's is in in a few days. Do you have an email address I could chat with you at when its in.. Maybe together we can make this work, its a REALLY nice car.

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  • Ford Master
  • 22,246 Answers

Some electrical component is overheating thats for sure but what and where ??

Posted on Oct 04, 2010

  • oh_youtouchm Oct 04, 2010

    Thats what I thought... I was also thinking fuel pump because it will die, and if you leave the key on it kind of sounds like it turns on and off which makes sense with the surging rpms before it dies. Maybe the exhaust heats up the wires that bring power to the pump or something? Whats your idea on the fuel pump thought, anything? Ive spent over 400$ in the last 2 days trying to fix this..

  • Colin Stickland
    Colin Stickland Oct 04, 2010

    sorry but never worked on one of this model but i would like to have a bash trust me ,now the pump is a likely suspect but again its difficult to diagnose without my horrible oil encrusted fingers under the bonnet --sorry hood ,,,must learn proper english ,anyway is it possible that the fuel pump was made for a flow rate of whatever but your monster 5litre engine needs a higher flow rate pump so yours is overworking ?? now if you was closer i would pop around for coffee and a chat and i would bring my magic hammer that cures all sorts of problems but iam in spain so thats out ,anyway check it out flow rate capacity ,or put another inline pump on under the bonnet and see what happens ,sorry their i go again HOOD

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Posted on Jan 02, 2017

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