I am a new member and have a problem maybe you can help me with.I have a 1987 4x4 f-150 , 4speed.I have a no start but cranks fine.no pulse to my coil or injectors.I have performed all kinds of electrical test,resistance,continuity,ect.After all that I got frustrated and replaced the following.Coil,Module,Pickup,Rotor, pcm. Still nothing. I have not replaced the eec,or fuel pump relay yet.The fuel pumps come on when the key is turned on and don't go off after 5 seconds that is why I replaced the pcm because that has the timer inside it for the injectors,as per a response that was posted on the forum. Any help would be appreciated.

 

First off, Welcome to the forums!

If the fuel pump doesnt turn off within like 1 secong theres a problem. Replace your FPR and see if that dont do the trick, had the same problem 2 months ago.

BTW, are you getting spark after all those replacements?

 

Did replacing the fuel pump solve the problem with the fuel pumps not turning off?

Replacing the fuel pressure regulator won't (well, shouldn't) fix that problem.

 

FPR= Fuel Pump Relay

Sorry, should have specified

 

Iwill try that. Maybe the relay is stuck closed huh?I will let you know

 

I had the same problem, the fuel pump would either run constantly or not at all and wouldnt start either way. Got a new relay and she fired right up

 

If the relay is stuck closed the engine will still start.
But the fuel pumps will run all the time even with the key off.

 

Well I put on a fuel pump relay and the pump still runs all the time and still no start.Do you have any other ideas? I'm out of ideas.

 

Yes the computer is bad.

 

yep, sounds like your computer took a dump

Head to the jy for one unless u wanna spend a good amount on one new

 

misewell get 2 of em while youre there. theyre 20 bucks at my local yard. 40 is still nothin when youre losin your mind chasin down problems. the truck coulda wound up at the jy cuz the last guy had a fried eec and got tired of dumpin money in it. getting 2 minimizes this chance. my .02.

 

already put in a new computer before the new fuel pump relay, still no spark , no run. fuel pumps still run all the time.

 

Removed the cap and see if the distributor is turning.

 

Has the fuel pumps ran all the time the key is on as long as you have owned the truck?
If so sounds like someone has rewired the fuel pump relay circuit.
You will have spark with the computer unplugged.
Maybe you have a bad PIP sensor on the stator inside the distributor.