boxathey
Full Access Member
Hello Im working on my uncles 2002 F-250 7.3 zf-6 4x4 , his truck starts right up runs great for about tenty thirty minutes. then it will die. truck will turn over really fast but wont start. about an hour later it will start right up and run perfect starting the cycle all over again. I changed the cps twice asuming that was the problem. It didnt seem to help. (twice because i thought the first one was bad). I plugged my Scan Gauge II in and found when the truck was runnig everything looked perfect. when it would stall out and not start back up this is what I found. IPR = 65 %, ICP = 161 PSI, I know the engine needs 500 PSI to start. I was going to buy both a new IPR and an ICP but i was hoping to get an explanation of what is happening. I think the IPR is some how sticking open when the vehicle gets hot. I dont think thier is a bad o-ring on the ipr because when the truck is running normally i get roughly 7-14% IPR and 750-1500 PSI ICP. at idle/slow driving. At WOT 30-35 % IPR , 2000-2500 PSI ICP. I guess it could be just a bad ICP mis reading when the engine gets hot. and not showing actual. ICP. i havent tried unplugging the ICP yet.
Thanks Guys
Thanks Guys