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2002 F250 No start hot, now no start period
Newbee to the forum as a poster. Been researching the site for a long time. I've seen many folks with similar problems, so let me lay out my issue.
I have a 2002 F250, 7.3L PSD bone stock, 235K miles. A few months ago I experienced a stall when hot (normal operating temp). A few hours later it started back. Thought it was a CPS at first, but since it started, I just drove it. Stalled again, no-start hot, but restarted after hour cooldown. Took it to a Ford dealership (Smith Ford, Conway AR) where they replaced an oil pressure sensor for $500. Truck started (cold, obviously) and it worked fairly well for a few weeks. Then it started having problems again. Starts cold, runs fine, but wont re-start hot, occasionally dies when driving. I've taken it back to the dealership several times where they are unable to repeat the problem. Finally quit alltogether. No restart at all. New CPS, new oil pressure sensor, new batteries. Fresh oil and filter change, fresh fuel filter change. Unplugged the oil pressure sensor. Still, no restart. I get the normal glow plug WTS light with key roll-on. I've seen lots of posts where folks have similar problems, but not one that tells what the problem turned out to be.
Ordering an AE scanner w/Ford bundle Monday. Looking for HPOP pressure, IPR duty cycle, RPM (to verify CPS is working). Is there anything I can look for to verify the IDM is working properly? With the WTS light working normally and no blown fuses, I am assuming the PCM isn't dead (doesn't necessarilly mean it's working properly).
Any help would be greatly appreciated.