eanturner

i just got a f150 from my dad. it has a rebuilt 5.0 302 EFI in it that has only 50,000 miles on it. its all stock. but every morning when i go to start it, it starts fine, but runs really rough. and acts like it has a miss to it. then when it gets warmed up it runs fine down the high way, with no problems. but when i shut the truck off and try to start it again, its flooded. i have to hold the gas to the floor to get it to start, and then it either idles really high for a minute or runs really rough. but i've already replaced the fuel pressure regulator, and the spark plugs and ive checked for vacuum leaks. please let me know. and please dont send a link to a diagram or some other website, tell me what you think the problem is or know what the problem is. thanks

R.S.LOGAN

Could try the temp sensor for the PCM.

Bert

Have you checked to see if there are any codes?

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Bert

eanturner

no i have not checked for codes, i do not have a code puller. but my dad did disconnect the EGR vacuum line from the EGR next to the butterflys, because when its hooked up it runs like shit. but im really thinking thats the problem.

Bert

If you ever want to, here's how. Fuel Injection Technical Library » How To Run a Self-Test

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Bert

walperstyle

compression check

Bluegrass

The motor is in continious cold start rich mode even after warmup indicated by the flooding condition and having to clear it out by holding the throttle wide open to shut the fuel injection off.
The items that could cause this are the coolant temperature sensor [for the computer] not the dash gage, the MAP sensor, open OX sensor wiring.
A fault with any of these will cause the injection to go rich.
Good bet the motor replacment missed something when hooking up the wireing.
Good luck.