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Old 07-12-2007, 08:50 AM
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Calling all FORD techs 93' e350

I am pulling my hair out working on a 93' ford e-250 with a 4.9l (300) 6cyl. It is running like El crappolla. If you feather into the throttle slowly in neutral it will rev up,but will die if you go much past 1/4 of the way rapidly.If you try to accelerate in drive it will die. At idle it is puking black smoke. I have another good running one that I have used for test parts. I have tried the MAP sensor, the air intake temp sensor,coolant temp sensor,the tps, the fuel pressure regulator. The distributor was replaced maybe a year ago with a Motorcraft. The plugs and wires aren't very old either I think we changed them same time as the distributor. It isn't missing at idle,has a slight skip as you bring the RPM up. Sometimes it will back fire out the exhaust REALLY loud. It is an ECC-IV system. Any ideas??? and I do mean any will be appreciated.thanks Brian
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Old 07-12-2007, 09:52 AM
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My first thoughts with the revving in neutral being allowed, but dying under load, and dying if you try to rev quickly, and most importantly the black smoke, is a very rich fuel mixture. My car acted just like that when the choke decided to come on after the car was warmed up. I know yours isn't carbureted, but that's what it sounds like.

It sounds like the injectors, or the computer assigning the fuel mixture, is the culprit here.

That's all I can guess for right now. Good luck, and tell us what happens.
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Old 07-13-2007, 08:13 AM
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I forgot to mention, maybe throttle body??? I'm not real definite on efi engines.
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