99 f250 poor cold running, hard start, no start, stall
First I want to thank the owners of this site, I was a participant back when it was called forddiesel.com and It has been an excellent resource!
I have owned Ford diesels for years, 85 f250, 89 f350, 98 f250, and my current problem truck, a 1999 f250.
I have ignored a problem that has been worsening over the past 6 months, that problem being poor running until up to temperature, and having to crank for and increasing amount of time (over 4 seconds) with the engine hot or cold.
About a month ago, it did something new, it stalled while idling from a cold start, but restarted without problem.
Today it was a no start, turn the key, no GP (WTS) light, cranked fine, and no smoke from the tailpipe. I cranked 3 or 4 times for about 25 seconds each try and then stopped trying before consulting the vast knowledge of this site.
A few hours later I jumpered the big terminals of the GPR and tried again, same thing, good crank, no start, no smoke. I then connected a battery charger and jumper cables to my 85 diesel to get some extra juice and 30 minutes later tried again, still no go. I let it sit for another 30 minutes before I tried again and then I got it started... but it was really not right.
I turned the key, and no WTS light, so I went to jumper the GPR again and when I got to the engine I could hear it cycling but rapidly, a second or two on and a few seconds off so I did not jump the GPR. The dash indicators WTS, check engine, and some other one on the left side were flashing in unison with the clicking sound of the GPS relay and after letting this go on for another 20 seconds I cranked it (about 10 seconds) and it started. Then it did the same problem from a month ago, it stalled 3 times, but this time only for a fraction of a second each time and then contunued running without having to restart.
The truck has about 190,000 miles, and I bought it at 100,000 with the big air filter, 4" exhaust (no muffler), exhaust brake, and I assume (but don't know) chipped, and perhaps larger injectors.
Two years ago I blew an o-ring on the HPOP but I really forget if I replaced the pump too. Kind of sad, I did the work myself.
Batteries, new 3 months ago.
Alternator, new 6 months ago (and also 18 months ago)
Fuel, full topped off with 28 gallons yesterday, I think it holds 38.
Oil last checked, 300 miles ago, changed about 1000 ago, Rotella.
I have never replaced any of the relays, sensors, or computer components in the 4 or 5 years I put 90,000 miles on it.
I have not broken out the multimeter yet, so I have not tested the GPR, but it seemed to work when it was told to. I just did not have the time today to get into this project.