OK this has literally been going on for over 2 years and I have had 3 different shops work on it but it's still happening. I come out and try the truck and it turns over without difficulty but does not start. This only happens when the truck has sat at least overnight. It never happens when the truck is warm. It usually happens 2 to 6 mos apart but lately it's been every few weeks. heres what has been done and what I was told was checked:
Ford dealership stated it was due to having a program in system. They updated computer and truck started.
3 days later back to same dealership. They R&R high pressure pump and replace HPOP fitting.
Removed IPR and inspected screen, cleaned and reinstalled
Performed high pressure oil leak, no leaks, checked harness, no shorts found. Found CMP intermittent on start up. Replaced CMP sensor.
Replaced VGT connector with CMP connector
Batteries were found to be weak, replaced both batteries.
There were also 6 other times the truck would not start but I came back, later in the day, and it started right up. I've been told the oil pressure is fine and fuel pressure is fine. In fact the last place says there is no reason it won't start, obviously there is since it won't. The last time was the replacing the batteries idea. There has also never been any codes when it won't start according to the dealerships and independent. I also had Matt write a tune disabling PATS in case that was it but that didn't stop it. It does this whether there is a tune in or whether I return it to stock. Now it sits in my driveway and won't start and I will need to tow it somewhere but it's been to three shops, 2 Ford and 1 independent, and still has the exact same problem. Any help would be appreciated. Even a garage in Central Florida to take it. I've been to two different Mullinax's and Mobile Oval at the recommendations of those here.
Thanks for the help Bud. I've read through quite a bit of info in the tech section on the 6.0 but still can't find a direction to follow and apparently neither can the techs :-) . And unfortunately the Excursions did come with the PATS system but I believed that has been ruled out. As for the FICM, I sat there and watched as the last mechanic tested everything he could think of and telling me what the numbers should be and what they were. Each time they were within the parameters he was looking for. I believe the FICM tested at 47.5 and never dropped below 47 when it was being cranked. Since each test he performed came up with the correct results he started playing with harnesses trying to find any possible short. He is the one that made the statement that there was nothing keeping the truck from starting. After a few hours and the truck sitting on a charger because the batteries had drained down he just walked out there and tried it before he left for the day and it started up. Still no codes and he has no idea what was keeping it from starting.
Any additional info I can give you to help diagnose or steer me in the right direction let me know. If you want the numbers for the tests I'll get them too.
1997 F250 HD Supercab 4X4
Last edited by WIKD; 09-02-2012 at 07:33 PM.
No problem Bud. Benny I'll have to pick one up. I have the Edge CTS and a SCT. Will either give me any of the info you need? I tried the wiggle idea but no go.
Cheezit I completely agree. It seems like when the technicians are checking it they can't find anything wrong as they check one thing after another. Then at some point it starts for them and at that point they can't diagnose anything further because it starts. And once it starts it will not act up again until after it sits at least overnight and usually not for a week to 6 months. Very aggravating and right now causing problems for me getting to work since it's happening so often. Which again might be a symptom. For 2 years there was at least a 3 month interval between problems, sometimes 6 months. Now it has happened 4 times in less than a month.
Since it is sitting and not starting, what is the ICP when cranking (and IPR %)?
Did they not replace the dummy plugs when they did the STC ftting?
Personally, I would be sending the FICM off (or AT LEAST asking Ed for a loaner) - they can go bad on the logic side as well as the power side.
What you need (to begin with):
When engine is cold, verify that EBP, MAP, and Baro are all the same value (within a few tenths).
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