A couple of months back I asked for some info about removing my 6.0 to r&r heads and gaskets. Everyone was very helpful, had 3 cracks in 1 and 2 cracks in the other, new heads, new gaskets everything ready to go. Cycled the key a few times to purge fuel and spun about 20 sec started right up. Seemed like boost was down or non existent but didnt have scan gauge installed yet. Anyway ran for 15-20 min, backed down driveway and made a little run down the street a couple hundred yards. Shut off engine waited a min or so to restart and engine spun 20-30 sec before starting. Let it sit overnight and read that a couple of wot runs may clear this up, only one problem....It will not restart... Tried everything, finally got gauge hooked up and this is the readings KOEO

FLP 11.5
FMP 47.5
IPR 14.4
ICP 49


KOEcrankimg

FLP 11.0
FMP 48.0
IPR 77.6
ICP 62

The ICP varied everytime sometimes 3200+ sometimes 1100

I have unplugged the ICP and nothing, I hope someone can help me with this.

Thank In Advance

 

ICP needs tobe 500 psi to start. Your IPR is just a little low. Since you tried the icp unplugging trick and it still didn't start you either have a hpoil leak or a bad IPR.

IPR should be 85% but it should still be allowing about 2500 psi. so I really suspect a hp oil leak.

 

Motor only has about 75 k, could it be as simple as the screen behind the IPR. That is my next thing to dig in and check.

 

I agree, especially with the IPR % going as high as it did and the ICP at only 62 psi, I'd say HPO leak or HPOP failure.

 

Did you put New Heads on and reuse Standpipes??

Change the oil cooler during work at all????????????

 

New heads, New standpipes, reused ARP Studs, No oil cooler work done, A new cooler was installed 25 k ago when ARP were installed, EGR delete, New HG, just trying to make sure i didnt miss anything before i start taking stuff apart.

 

check ipr for a hole in the screen. icp is basicly only seeing base oil pressure in the rail

 

OK, if screen is ok and o-rings on crankcase to head tubes are ok, where else should i be looking for a leak? The drivers side looks good gonna pull pass side valve cover tues morning just wanting to know what to look for if it all checks out. Thanks

 

What year is your truck? If 05 or newer did you replace the STC fitting? If its older perhaps the IPR or the HPOP has bit the dust.

 

04 motor has 75k. Is there any way to test IPR off of the truck? i had no sign of hpop problems before i r&r the hg, it just will not start now

 

Check IPR and pulled valve covers and checked stand pipes, everything is good. Put everything back still no start idk what else to check