No start hot
Thread Starter
|
More Turbo
Joined: Feb 2018
Posts: 504
Likes: 24
From: CT
No start hot
Having a no start hot issue. I recently installed injectors, and a known good SRP1.1 HPOP. Truck idles funny all the time and will not restart hot, the IPR maxes out and the ICP takes a while to move up to 400psi and once and a while will reach 500psi to start. Bought a new IPR for it and a new ICP sensor and the issue remains. I tested for injector o ring leaks thru the IPR hole with the special tool and I cannot find any when the truck is cold.
Only code is for the #7 injector high to low side open but I ohmed out everything and everything is around 3ohms.
As far as I can tell there is nothing else that could cause a no start hot.
Only code is for the #7 injector high to low side open but I ohmed out everything and everything is around 3ohms.
As far as I can tell there is nothing else that could cause a no start hot.
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Ok, new Motorcraft stuff? If yes then what's the level in hpop res. Have you double checked the hpop gear and bolt? After that I'd do some dead head tests, first pump alone then each head separate.
Thread Starter
|
More Turbo
Joined: Feb 2018
Posts: 504
Likes: 24
From: CT
I checked the HPOP reservoir cold and it was less than an inch from the top.
i will check the gear but if it was that wouldn’t I constantly have a no start? The HPOP has been in for a few months now and only gave me issues after I did my injectors and cups.
Got Data?
Joined: Dec 2012
Posts: 4,267
Likes: 1,403
From: Lake Stevens, WA
Agree your HPOP gear is likely fine.
If the issue started after injectors/cups, that's where I'd start. If high pressure oil builds slowly, it would point to an injector O-ring leak, or defective IPR not closing enough to build pressure. I would think you'd catch it with your IPR hole pressure test though.
Do you have the original IPR to compare?
If the issue started after injectors/cups, that's where I'd start. If high pressure oil builds slowly, it would point to an injector O-ring leak, or defective IPR not closing enough to build pressure. I would think you'd catch it with your IPR hole pressure test though.
Do you have the original IPR to compare?
Thread Starter
|
More Turbo
Joined: Feb 2018
Posts: 504
Likes: 24
From: CT
Agree your HPOP gear is likely fine.
If the issue started after injectors/cups, that's where I'd start. If high pressure oil builds slowly, it would point to an injector O-ring leak, or defective IPR not closing enough to build pressure. I would think you'd catch it with your IPR hole pressure test though.
Do you have the original IPR to compare?
If the issue started after injectors/cups, that's where I'd start. If high pressure oil builds slowly, it would point to an injector O-ring leak, or defective IPR not closing enough to build pressure. I would think you'd catch it with your IPR hole pressure test though.
Do you have the original IPR to compare?
Just to make sure, I hooked up my air hose to the IPR air tool, and then turned up the regulator, to around 90psi. I let it sit for five minutes before quitting and nothing was leaking. That should be the correct way to test right?
Got Data?
Joined: Dec 2012
Posts: 4,267
Likes: 1,403
From: Lake Stevens, WA
I think so. I have not done it, but was reading this link with info on the procedure:
https://jj-motorsports.com/products/...-test-fittings
You can check and see if the middle O-ring has failed on an injector by looking in the fuel bowl for oil/bubbles during this test as well.
You can crank the pressure up to 150psi - that might help. It says "shop air", and this oil system pushes 3000psi. I'd crank it up. Maybe that's why you can't hear it - 90 psi might not be enough.
https://jj-motorsports.com/products/...-test-fittings
You can check and see if the middle O-ring has failed on an injector by looking in the fuel bowl for oil/bubbles during this test as well.
You can crank the pressure up to 150psi - that might help. It says "shop air", and this oil system pushes 3000psi. I'd crank it up. Maybe that's why you can't hear it - 90 psi might not be enough.
Thread Starter
|
More Turbo
Joined: Feb 2018
Posts: 504
Likes: 24
From: CT
I think so. I have not done it, but was reading this link with info on the procedure:
https://jj-motorsports.com/products/...-test-fittings
You can check and see if the middle O-ring has failed on an injector by looking in the fuel bowl for oil/bubbles during this test as well.
You can crank the pressure up to 150psi - that might help. It says "shop air", and this oil system pushes 3000psi. I'd crank it up. Maybe that's why you can't hear it - 90 psi might not be enough.
https://jj-motorsports.com/products/...-test-fittings
You can check and see if the middle O-ring has failed on an injector by looking in the fuel bowl for oil/bubbles during this test as well.
You can crank the pressure up to 150psi - that might help. It says "shop air", and this oil system pushes 3000psi. I'd crank it up. Maybe that's why you can't hear it - 90 psi might not be enough.
Trending Topics
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
When I air tested my heads a couple months ago I had to use a stethoscope to track down a leak. But if the leak is that's small you should still be able to start the truck. Maybe get a sample of fuel from the return line wherever is convenient. If the oils brand new not sure how well it will show up but worth a try I suppose. Since you did the injector cups as well have you checked the Degas bottle
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
Top 10 Fords at 2026 Carlisle Ford Nationals
Joe Kucinski
3 Best / 3 Worst Parts of Modern Ford Ownership
Brett Foote
10 Amazing Upgrades That Solve Common Ford Truck Owner Headaches
Pouria Savadkouei
Every 2026 Ford Engine Explained
Brett Foote
10 Ugly Ford Trucks That We Still Kinda Love
Joe Kucinski
10 Things Every Truck Owner NEEDS (2026 Edition)
Michael S. Palmer
Rezvani's Latest Post-Apocalyptic Monster Is a Ford F-150 Raptor Underneath
Verdad Gallardo
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
Thread Starter
|
More Turbo
Joined: Feb 2018
Posts: 504
Likes: 24
From: CT
So I went and fixed some wiring cause it looked kinda janky and I used the old IPR pigtail to apply full ground to the IPR and get a max ICP reading.
Well when I applied ground I got 15% IPR. Shouldn’t it be at 99% reading from the PCM?
EDIT: I’m an idiot, the PCM is reading the default %.
Any tips from here? The PCM commands the IPR to go up but as far as I can tell it isn’t actually up like commanded.
The HPOP got to 2700psi so I confirmed the pump is good.
Well when I applied ground I got 15% IPR. Shouldn’t it be at 99% reading from the PCM?
EDIT: I’m an idiot, the PCM is reading the default %.
Any tips from here? The PCM commands the IPR to go up but as far as I can tell it isn’t actually up like commanded.
The HPOP got to 2700psi so I confirmed the pump is good.
Thread Starter
|
More Turbo
Joined: Feb 2018
Posts: 504
Likes: 24
From: CT
Just dead headed the pump, puts out over 3000psi.
Checked the passenger side, made 3000psi.
Checked the driver side, same thing over 3000psi.
wouldn’t I have noticed a leak from the injector o rings when I cranked the engine over cause 3000psi was injected into the heads?
Checked the passenger side, made 3000psi.
Checked the driver side, same thing over 3000psi.
wouldn’t I have noticed a leak from the injector o rings when I cranked the engine over cause 3000psi was injected into the heads?
Lead Driver
Joined: Oct 2005
Posts: 6,129
Likes: 1,919
From: Ponca City, OK
Just dead headed the pump, puts out over 3000psi.
Checked the passenger side, made 3000psi.
Checked the driver side, same thing over 3000psi.
wouldn’t I have noticed a leak from the injector o rings when I cranked the engine over cause 3000psi was injected into the heads?
Checked the passenger side, made 3000psi.
Checked the driver side, same thing over 3000psi.
wouldn’t I have noticed a leak from the injector o rings when I cranked the engine over cause 3000psi was injected into the heads?
Got Data?
Joined: Dec 2012
Posts: 4,267
Likes: 1,403
From: Lake Stevens, WA
I agree, that bad injector explains this symptom, but not the no start. I expect there's more to come here. Bad new IPR or related wiring is all that makes sense to me right now.