5.0L (1979-1995) MustangTechnical 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.
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since my tranny had been making all sorts of noise shifting i have parked it and got a beater... i went to start my stang yesterday and the battery was dead. i charged the battery and started it. it ran ok for a few min and then it started to run like ****, backfired a few times and quit then wouldnt start again. this was at night and i had my hood light unplugged so i could see if any of my wires were arching...well i found a plug wire arching on my ac line and my MSD blaster coil was throwing sparks everywhere! i tried to fire it up again after i put another coil on it but it would just crank nothing else...fuel pump relay wouldnt come on wot relay wouldnt come on. All the dash lights were ok execpt for the cel. it was really dim. i took the cover off my fuel pump relay and pressed the plunger down and my pump came on i tried to start it and it did run while i had my finger on the relay. i quit for the day and came out the next evening and now it just cranks even when it has fuel. wtf is going on?
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too much to list!
so why don't you stop throwing parts at it and properly troubleshoot it???...first grab a can of spray start and spray a little in the TB....does it briefly fire up???...if so you have a fuel system prob....I assume the battery is fully charged?? cranks fast but won't start right??.......anyway if it fires on ether, test for fuel pressure, if none, grab a test light and check for power at the relay under the seat = fp relay , you should have power to the pump from relay briefly when key is switched on and while cranking, if none you need to make sure the ecm is seeing a PIP signal from the tfi and commanding the windings in on the relay to engauge the relay.....make sure you have no blown fuses either, you should have power on one of the heavier wires to the fp relay at rest =koeo.....and power on one of the smaller wires for the relay windings, ecm controls the ground side of the windings....
Originally Posted by dudegirl
Be polite and cordial when you talk to them, as pissing off the guys that can help you is seldom a good idea.
so i finally got the time to sit down and fault trace this problem and i found it to be in the eec power relay. i thought it was good bc it was clicking and such when the key was turned on, but as it turns out it had corrosion on the inside and it wasnt making contact. well now that its sitting at my work and able to be driven... i have no insurance on it to drive home lol(about 45 in from my house) oops lol thanks for all of your help!
too much to list!
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