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hard start cold no start hot

5539 Views 9 Replies 7 Participants Last post by  pxt144
I was helping a neighbor diagnosis his 99 Powerstroke today. He had an issue where the truck lost power and would not restart hot. He replaced the IPR and the ICP, checked fuel, replaced fuel filter, checked fuel pump. I ran some diagnostics on the truck with AE and truck is very slow to build HP oil when cold and the duty cycle had to go to like 60% before it could build 500psi to fire the injectors. When hot it will only got to just under 400psi and spikes the duty cycle to 65% with no start. Buzz test passes fine but contribution fails number 8 only every time. There were codes after the drive cycle for low/high inj pressure and inj pressure delta. Truck runs OK but duty cycle looks high to me for conditions.

My diagnosis is most likely leaking injector O-rings with number 8 be the place to look first. HPOP was replaced a year and a half ago due to a fitting failure in the pump. What do you guys say?
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:confused:O.k. I'm still having the same problem, Tom was very helpful with running the diagnostics, I thought I had it diagnosed But I'm not having much luck. Truck is very hard to start, I had a diagnostic run on it with a friends Auto Enginuity program and it showed that the truck was barely getting up to 490 in oil pressure just for it to start with the engine working cycle at 60%, way to high. Once the truck starts it seems fine, But the work cycle is very high even at idle, with the oil pressure struggling. I was getting a failure at injector #8, so we assumed it was the injector o-rings, ran a Buzz test on all injectors and they were good.

Here is a list of what I have replaced so far and the truck is still acting the same way, cranks over for 10 to 15 seconds until pressure is built up to a minimum of 500 to start.

All 8 injector o-rings
All 8 Glow PLugs

The only thing I haven't changed because I replaced it 2 years ago is the HPOP.

2000 F250 XLT SuperDuty Extended Cab
4x4 Off Road Package, TT Package
90,500 miles
HyperTech III
4" Turbo Back Exhaust
K&N Air Filter Generation II
3" lift
Custom Rims with 315 BF GoodRich AT
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