5.0L (1979-1995) Mustang Technical discussions on 5.0 Liter Mustangs within. This does not include the 5.0 from the 2011 Mustang GT. That information is in the 2005-1011 section.

help no start 87 5.0

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Old 08-10-2009, 02:08 PM
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jkrum10238
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Default help no start 87 5.0

i tried searching with no luck

i was about half way to on the mile drive to the track when my car started leaning out in rpms past 5k so i figured i must have my fuel press reg to low so i kept going and then it starts cutting out at 4k then down to 3 and so on till it will barely idle the idle sounds like its out of time but it isn't my dist tight no way it moved i looked for ovb things melted wires loose conections and so on. car won't even start now. i believe its a fuel problem the fuel pressure primes to normal 38+/-lbs and then sharply drops off, i ran a koeo test and came up with a 95-Fuel Pump Circuit Open-PCM To Motor Ground what exactly does this mean. also a week earlier i lost power to my eec i couldn't find the problem so i ran a new fused wire to the eec. any ideas? thanks
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Old 08-10-2009, 03:27 PM
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94ford5liter
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Did you check your fuel pump relay? It's one of the large square fuses in the fuse box in the engine bay.
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Old 08-10-2009, 04:14 PM
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mattdel
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fuel pump relay is under the drivers seat...


Last edited by mattdel; 08-10-2009 at 04:20 PM.
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Old 08-10-2009, 07:53 PM
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jkrum10238
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relays are brand new my 255 lph is humming like normal i even tried to trip the relay and keep the pump on constant but no luck
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Old 08-11-2009, 07:21 AM
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bumpp
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Old 08-11-2009, 07:56 AM
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Baddog
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I posted something similar about a year ago. Rather than being my long winded self let me say this. Check your coil and coil lead to the dizzy. My car cranked and cranked and cranked but you could hear there was just no way it would come to life. I could hear the fuel pump prime upon startup and after lots of cranking could even smell raw fuel inside the car. Sometimes it would start and run and what I figured was running well. I'd park and go for a bite and an hour later it wouldn't light up. The coil stem was the problem, the lead didn't grip on properly and was always loose. The fact that the problem was intermittent was what kept me guessing. New wires that grip like a hand in a velvet glove rectified the problem and released what feels like an additional 25hp. Check to make sure you're getting full conductivity at the coil. Good luck...

PS-why are you using a 255lph fuel pump on a stock motor?
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Old 08-11-2009, 11:48 PM
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because im doing h/c/i soon and i needed a new pump so i figured id upgrade while i was doing it
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