Kind of a different hot start problem, hope you guys can help narrow it down with your experiences.
1988 F350, 460
Runs great cold, when warmed up, if you shut it off, it will restart, If you shut it off again, it might restart. If you shut it off and try a third time. No way.
So example, get home from work change close, hop in restarts fine, stop get gas, restarts rough, stop buy beer, will not restart, drink all the beer (engine cools down) starts great, entire process reset.
When it doesn't start it spits, pops and backfires.
Doesn't seem to matter whether it sits 1 minute or 10 between retries.
It will happen every time.

Codes left in the computer, Oxygen sensor stuck lean, and EGR movement not detected. Already changed TPS, and ECT because of computer codes, they made no difference, but the codes are gone now.
FPR is new, from what I read I still need to pull the vaccum line and look for fuel.
Distributor including the TFI and PIP are new, Both fuel pumps are new. I have verified fuel pressure (40psi) and spark when this no start happens.
I know the O2 snesor says stuck lean and that would dump more fuel, or is it reading correctly and I am not getting enough fuel?
If I hold the pedal down all the way, it seems to want to start, but the second I let up it dies instantly. That might just be my imagination.
Battery voltage is fine, engine cranks great.

I am still reading all the old posts, but I need to check vaccum line to FPR for fuel, then what? should I just thow an O2 sensor in? At this point I am just grasping at straws.

Any of you guys have a problem that sounds like this one?

I think I have all the details, We have done a ton of work trying to fix it, I want to fix it before winter comes and it goes away again.

 

You will want to change the O2 sensor because it will improve your gas mileage. However, it won't help your problem.

It sounds to me like the coil isn't working as good when it's hot. It's somewhat common for this to happen. I bet if you change the coil, your problem will go away.

 

thousands of members and only one thoughtful guy to reply?

Thank you Andym the coil and O2 sensors are noe eliminated as not the problem.

I cannot believe nobody will take a stab at this. The problem still exists so have at it.

 

I think Andym has it. I had this same issue in my 67 F100, during the summer once the engine got hot it would not restart. During the winter it worked fine but in the summer once I shut it down it had to cool (about 40 minutes) before restarting. I replaced the Coil and never had the problem again. Hope this helps.

 

replace your starter

 

I am gonna say it could possibly be the distributor bushings playing a part in that, pull the cap and check for side to side play, up and down is normal. Also I just fixed an older trick with this prob, it would actually shoot flames out the exaust while trying to restart, it was a bad wire to the distributor. If it cranks fine and you have replaced the coil I'd lean towards the distributor.

 

I think that is also a symtom of a weak pick up coil in the distributor.

 

Yup, thats also a possibility.

 

I've got an 89 and have somewhat the same problem. When she gets hot I have to hold the peddle down while I start it. Mine does always start but makes me wonder if the injectors are dumping a fuel rail full of gas into the chamber when it is stopped. I haven't verified this, but is this possible? And no I am not holding the peddle wide open, just cracking it 1/4 throttle and she starts up, not stumbling, gasping or any other "sounds like it's flooded" symptoms.
Correct me if I'm wrong here, but don't these trucks sense the manifold vacuum pressure (Absolute Vacuum Pressure) as opposed to the air flow?. If so, could the heat expand the manifold, causing a leak, causing low vacuum which would make the truck think it was running at higher revs, causing lean condition. Too far out in left field?