Hey guys, my truck is making 350 PSI when the IPR is unplugged and well over 3000 when is is plugged in. I have a high pressure gauge hooked up to the ICP to monitor this. When the IPR is plugged in and it makes the 3000+ PSI the truck does not start. Any ideas on what's causing this?
The truck initially had a stall when hot. This was a problem that I could not figure out since there weren't any leaks in the HPO system. I tested it with the air test through the IPR and by doing a high pressure test by hooking up a gauge to the ICP while the truck is running. Now it won't start and pressure builds to 3000+ PSI while cranking with the IPR plugged in and builds 350 PSI with it unplugged.
I'm monitoring the pressure using a high pressure gauge that's in place of the ICP. So I'm getting actual readings. The gauge goes up to 3000 PSI and with IPR connected it actually goes to 4000+. Can't really tell because it's maxing out the gauge.
Sync is for the camshaft and crankshaft sensors, it has very little to do with this situation. By unhooking the ICP it will just default the IPR to be open at 32% if I remember correctly. Still the engine should not develop 3000-4000 or more PSI while cranking, you only need 450 to start. I think a normal system will develop 900 max at crank and idle at 600.