HPOP testing
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Tuned
Joined: Jan 2010
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HPOP testing
I think my long cranking on cold starts and occasional no hot start issue might be related to my HPOP. My FICM test fine. Batteries are in great shape and will crank the motor over all day. I suspect I'm losing oil pressure at the HPOP. I looked through the FAQ's and can't find anything about HPOP pressure testing methods. Can anyone point me towards a procedure to pressure test the HPOP and STC?
Thanks
Thanks
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Tuned
Joined: Jan 2010
Posts: 419
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You're so right. Sorry about that. 2006 6.0 F350 with 125,000 miles. Bone stock.
Post Fiend
Joined: Oct 2009
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From: N. Fort Worth, tx
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Tuned
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That's what I'm thinking too. Bismic previously posted this procedure to test the HPOP,
One way to diagnose for an HPOP leak without a teardown: Remove the ICP sensor --- use this hole to pressurize the HPO system with air (for you, the ICP is on the passenger side valve cover). I believe you would then need to have a way to send 12V power to the IPR, but only for 30 seconds or it will burn out.
Remove the oil fill cap, remove the CCV hose that goes into the air intake from the other valve cover, take a piece of heater hose and listen in BOTH spots after commanding the IPR valve to close (again - only for 30 seconds). If you hear air coming from either one it's probably a leak in one of the oil rails. If you hear air coming from BOTH sides it's probably the HPOP or STC fitting.
Note - I have not done this procedure, so if a Tech or other FTE member would care to correct any mistake I have made, I would appreciate it.
Also -
If IPR is at 80% while at hot idle, then you have high pressure oil leak, failed pump or a bad ipr valve.
IPR should be around 22-24% at hot idle; up to maybe 30% but that maybe a little too high.
Lastly:
There is a hole that is situated just above the HPOP drive gear. If air is heard/felt exiting this hole when air testing, this is normal if IPR duty cycle is not commanded to 100% because that is the exhaust passage. The way to condemn a high pressure oil pump is to air test it with the turbo oil supply tube removed from the top of the oil cooler base. If air is heard/felt from this port during air testing, the high pressure oil pump is bad.
Will this test just the pump, or will this show me if I have a leak somewhere, i.e. STC, dummy plugs, standpipe, etc? I've had this truck a year and it's always taken 3-4 seconds of cranking for it to start cold regardless of the ambient temp. Never ever had a hot start issue until a few months ago it took several tries to start. Then just a few days ago without warning it wouldn't hot start. Had it towed home. It cooled off and then it started like it normally does. Everything to me screams HPO system issue. Think I'm on the right track?
One way to diagnose for an HPOP leak without a teardown: Remove the ICP sensor --- use this hole to pressurize the HPO system with air (for you, the ICP is on the passenger side valve cover). I believe you would then need to have a way to send 12V power to the IPR, but only for 30 seconds or it will burn out.
Remove the oil fill cap, remove the CCV hose that goes into the air intake from the other valve cover, take a piece of heater hose and listen in BOTH spots after commanding the IPR valve to close (again - only for 30 seconds). If you hear air coming from either one it's probably a leak in one of the oil rails. If you hear air coming from BOTH sides it's probably the HPOP or STC fitting.
Note - I have not done this procedure, so if a Tech or other FTE member would care to correct any mistake I have made, I would appreciate it.
Also -
If IPR is at 80% while at hot idle, then you have high pressure oil leak, failed pump or a bad ipr valve.
IPR should be around 22-24% at hot idle; up to maybe 30% but that maybe a little too high.
Lastly:
There is a hole that is situated just above the HPOP drive gear. If air is heard/felt exiting this hole when air testing, this is normal if IPR duty cycle is not commanded to 100% because that is the exhaust passage. The way to condemn a high pressure oil pump is to air test it with the turbo oil supply tube removed from the top of the oil cooler base. If air is heard/felt from this port during air testing, the high pressure oil pump is bad.
Will this test just the pump, or will this show me if I have a leak somewhere, i.e. STC, dummy plugs, standpipe, etc? I've had this truck a year and it's always taken 3-4 seconds of cranking for it to start cold regardless of the ambient temp. Never ever had a hot start issue until a few months ago it took several tries to start. Then just a few days ago without warning it wouldn't hot start. Had it towed home. It cooled off and then it started like it normally does. Everything to me screams HPO system issue. Think I'm on the right track?
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