Diagnose ongoing no start.
Lead Driver
Joined: Jun 2004
Posts: 6,327
Likes: 585
From: Amarillo, TEXAS!
I'm going to say either a massive high pressure oil leak or a cratered pump. Even a bad IPR valve will build a couple hundred PSI cranking if everything else is OK.
Last edited by Pikachu; Nov 12, 2025 at 12:54 PM.
Got Data?
Joined: Dec 2012
Posts: 4,247
Likes: 1,381
From: Lake Stevens, WA
That's a good point. Might be good to remove the valve covers and crank, looking for oil from under the injector solenoids, indicating an upper o-ring leak. Or pressurize each head with shop air and see what can be heard. Finally, an HPOP deadhead test could confirm whether it's building pressure or not.
Lead Driver
Joined: Jul 2017
Posts: 6,854
Likes: 2,332
From: WV
If you contact CNC Fab, I expect they would help with diagnostic steps to confirm the HPOP, IPR, wiring etc since you’re running their pump.
Have you pulled the loom back to check the IPR and ICP wiring?
Maybe next step for me would be to apply direct power to the IPR (bypassing wire harness) to see if it builds pressure. I’d only do this briefly to keep from potentially hurting the IPR.
I’m sorry for your troubles Dan. You’ll get it back to 100% soon.
Have you pulled the loom back to check the IPR and ICP wiring?
Maybe next step for me would be to apply direct power to the IPR (bypassing wire harness) to see if it builds pressure. I’d only do this briefly to keep from potentially hurting the IPR.
I’m sorry for your troubles Dan. You’ll get it back to 100% soon.
CNCFAB
Joined: Apr 2020
Posts: 4,874
Likes: 2,006
Typically the stage 2 hpop will still produce 150psi with an open ipr(at least on a deadhead test)
even hpop moving nothing, cranking should show 30psi of lpop pressure pushing though the system if ipr is actually closing as commanded.
Could be a leak, lpop issue, or a catastrophic hpop failure for some reason.
We’ll do some diag and figure it out
even hpop moving nothing, cranking should show 30psi of lpop pressure pushing though the system if ipr is actually closing as commanded.
Could be a leak, lpop issue, or a catastrophic hpop failure for some reason.
We’ll do some diag and figure it out
FTE Chapter Leader
Joined: Jan 2005
Posts: 13,106
Likes: 4,714
From: Henderson, NV
Lead Driver
Joined: Jun 2004
Posts: 6,327
Likes: 585
From: Amarillo, TEXAS!
Newp. The PCM isn't aware of base engine oil pressure. You'd need to add a pressure transducer or analog gauge. If the dash gauge comes alive, the pressure is at least 7 psi.
FTE Leadership Emeritus
Joined: May 2014
Posts: 27,350
Likes: 5,945
From: Lake Hartwell, GA
You can check the LPOP with a gauge ported into the HPOP reservoir fill plug. If I recall correctly, it should be a minimum of 12 PSI.
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Most Expensive Ford Trucks Ever Sold on Bring a Trailer
Joe Kucinski
2027 Ford Super Duty Buyer's Guide (Every Model, Engine, & Package)
Brett Foote
Top 10 Ford Truck Tragedies
Joe Kucinski
AEV FXL Super Duty - the Super Duty Raptor Ford Doesn't Make
Brett Foote
Lobo Vs Lobo: Proof the F-150 Lobo Should Be Even Lower!
Michael S. Palmer
Ford's 2001 Explorer Sportsman Concept Looks For a New Home
Verdad Gallardo
10 Best Ford Truck Engines We Miss the Most!
Joe Kucinski
2026 Shelby F-150 Off-Road: Better Than a Raptor R?
Brett Foote
2027 Super Duty Carhartt Package First Look: 12 Things You NEED to Know!
Michael S. Palmer
Thread Starter
|
Lead Driver
Joined: Jun 2013
Posts: 5,647
Likes: 891
From: north of Minneapolis, MN
@FordTruckNoob @BWST @ESwift @Sous @z31freakify @JT250
I have gathered up various adapters to check LPOP and HPOP. When I removed the plug from the top of the reservoir to install a gauge to check LPOP....I find no oil in it.....at least not enough to get any on a long handle 3/16" hex wrench.....so down at least 2"
If I crank the starter for 10-15 seconds the gauge will come up to 40-42psi.
And now the oil level is within 1/2" of the top on the reservoir. I will check tomorrow morning and see where it's at.
I have gathered up various adapters to check LPOP and HPOP. When I removed the plug from the top of the reservoir to install a gauge to check LPOP....I find no oil in it.....at least not enough to get any on a long handle 3/16" hex wrench.....so down at least 2"
If I crank the starter for 10-15 seconds the gauge will come up to 40-42psi.
And now the oil level is within 1/2" of the top on the reservoir. I will check tomorrow morning and see where it's at.
Last edited by Dan V; Nov 13, 2025 at 05:18 PM.
Thread Starter
|
Lead Driver
Joined: Jun 2013
Posts: 5,647
Likes: 891
From: north of Minneapolis, MN
12 hours later....no oil in the reservoir.
Fleet Owner
Joined: Jun 2004
Posts: 25,090
Likes: 1,112
From: Rio Rico, AZ.
The one that prevents the HPOP reservoir from draining back into the oil pan when the engine is not running. Right now I forget the engineer's term for it, but it's around just below the bottom of the HPOP reservoir and part of the oil galley that feeds the HPOP reservoir. It may be part of the front cover casting, but don't quote me on that right now, LOL.