Punisher1964

OK, have a 1987 f150 with the 302 fuel injection( 140,000 miles ) and AOD trans. Last month, was driving to work ( 35 miles one way ). Got about 25 miles from home. Truck jerks- running between 45-50 mph, I feather throttle. Jerks 3 or 4 more times, and cuts off. Won't start. Call mechanic, have towed to his shop. He puts new fuel pump and ignition control module on it. I pick it up, drive it about 30 miles, does the same thing. Cranks up, and I drive it to my girlfriend's house ( 2 miles ). Let it sit for 3 hours. Drive it back to my house ( 25-30 miles, no problem. Carry it back to mechanic. He drives it, it cuts off, now won't crank. Any of you guys have any ideas as to what problem might be. Any advice would be greatly appreciated.

Bigred1996

When a truck shuts off like that it's losing either two things: spark or fuel. You already replaced fuel pump so that should narrow it down a bit.

GMtraitor

I would probably start by trying to read for any codes

Next I would try to get the truck running again...does the starter engage at all? Need more info on no start issue then maybe go back to correcting other problems. I'll assume that the starter is turning the engine but no startup... So fuel and/or spark...check fuel pressure at rail to confirm fuel and check spark by grounding a spark plug and wire

Bean Counter

Punisher - your description sounds eerily similar to what my '91 was doing. The beast would be running fine and then suddenly die for a split second and recover, die and recover. Sent one heck of a shock through the truck and scared the stew out of me. Mine turned out to primarily be that the Engine Control Module was dieing. I'd offer up the same advice I was given:
1) Check for any codes
2) Replace any and all vacuum lines - takes about $25 worth of high-grade line and 30 minutes of your time
3) Replace all of the guts in the distributor. (It's actually easier to replace the distributor - getting the old one broken down and then getting the gear back on is a pain. Doable, but a pain.)
4) Check all of your sensors and make sure they are within spec (requires a voltmeter, instructions can be found in readily available repair manuals)

If the truck still misbehaves (line mine did), then you're probably looking at replacing the ECM. I got mine from Rock Auto; I've only put about 100 miles on the truck since but the problem has not re-occurred.

Best of luck getting this resolved!
David (aka Bean Counter)

Punisher1964

Thanks guys. I will be back in the garage this Monday working on it. I will check everything you guys suggest. Will keep you updated.

Chris_1

iTrader: (1)

Check your main electrical connections - especially the grounds.
Could be off-base, but that sounds suspiciously like a bad connection.