Ford Power Stroke Nation banner

1 - 6 of 6 Posts

·
Registered
Joined
·
1 Posts
Discussion Starter #1
Hello. I’m having an issue with this truck. It’s an 05 f350 6.0L super duty lariat. It has intermittent long cranking seems to be while above 90°F oil temp. Truck does not stall/die when hot. found no codes, batteries low with bad alternator, good power balance test and relative compression tests, non functioning IPR valve. Replaced IPR valve. Replaced alternator and installed 2 new batteries. Builds icp quickly and maintains desired pressure. Long crank while hot still intermittently present after repairs. monitored sync and ficm sync while cranking. ficm sync intermittently doesn’t seem to change to yes as soon as sync and when this happens truck won’t start until it does. As soon as ficm sync present, truck starts. Put in good ficm and pcm for testing purposes, no change. Did a nitrogen test and determined it is a good sealed system. When ficm sync is not engaged, cranking rpms stay under 140.
Icp v key on engine off: .23V
Icp v cranking: 1.12V
Icp cranking: approx 830psi
Fuel pressure at idle: 63psi
Fuel pressure at wide open throttle: 56psi
Any info or direction is very much appreciated as ideas and patience are wearing thin
 

·
Registered
Joined
·
3 Posts
Have a mechanic check your cranking oil pressure when engine is hot. My truck first started having hot start issues when pulling a trailer. My mechanic said it might be an o-ring in the high pressure oil system, which there is around 16 of them. Cranking oil pressure was around 500. So I decided to keep driving till it got worse, thinking it would be easier to identify the bad o-ring. The issue gradually worsened to the point of having to let the truck idle while running errands or giving it an hour to cool down so it would start again. Finally one day it died while driving. Took it into mechanic, all o-rings were good. Unfortunately it turned out to be the high pressure oil pump.
 
1 - 6 of 6 Posts
Top