How to test IPR?
Thread Starter
|
Elder User
Joined: Dec 2007
Posts: 971
Likes: 1
From: IA MN SD
Update:
We put a scanner on the truck today and the IPR duty cycle never went above 25-30%. We talked to a Ford tech (I don't know how 6.0 savvy he way) who thinks its an injector. He thinks the injector gets stuck open and allows air from compression into the fuel system. This would explain why my original post how that air was getting into the fuel bowl.
Do you think this is a possibility? If so, is there a way to identify which injector it is (other than with a scanner)?
We put a scanner on the truck today and the IPR duty cycle never went above 25-30%. We talked to a Ford tech (I don't know how 6.0 savvy he way) who thinks its an injector. He thinks the injector gets stuck open and allows air from compression into the fuel system. This would explain why my original post how that air was getting into the fuel bowl.
Do you think this is a possibility? If so, is there a way to identify which injector it is (other than with a scanner)?
Cargo Master
Joined: Mar 2007
Posts: 3,103
Likes: 32
From: AB/BC
If an injector was stuck open it would hydro lock the motor in short order (50 psi of fuel pouring into the cylinder).If you were getting air in the fuel it would be a leaky injector sleeve or crush ring. Also while it was running with an injector stuck open the truck would smoke up the block in a minute with unburnt fuel.
Thread Starter
|
Elder User
Joined: Dec 2007
Posts: 971
Likes: 1
From: IA MN SD
I was suspicious of an injector diagnosis because of the lack of an SES light or codes or smoke, but my bro-in-law was convinced the Ford Tech was on to something.
Without a doubt, a stuck-open injector would create black smoke, correct? Would it also set a SES light?
Without a doubt, a stuck-open injector would create black smoke, correct? Would it also set a SES light?
Thread Starter
|
Elder User
Joined: Dec 2007
Posts: 971
Likes: 1
From: IA MN SD
I'd love to buy you a case of Molsons, or whatever your flavor is! I'm a Fat Tire / Sammie Adams guy myself.
We did a buzz test on the injectors and everything came back normal. However, we still haven't done the cylinder balance test. Hope to figure out how to do that tomorrow.
The smoke we're getting is almost clear, so it's hard to determine how much of it there really is. However, its extremely raunchy. It stinks up the whole shop quickly and it lingers for hours even with the exhaust fans on.
Tomorrow we're also going to put a heat gun on each cylinder and see if that doesn't identify any oddities.
We did a buzz test on the injectors and everything came back normal. However, we still haven't done the cylinder balance test. Hope to figure out how to do that tomorrow.
The smoke we're getting is almost clear, so it's hard to determine how much of it there really is. However, its extremely raunchy. It stinks up the whole shop quickly and it lingers for hours even with the exhaust fans on.
Tomorrow we're also going to put a heat gun on each cylinder and see if that doesn't identify any oddities.
Thread Starter
|
Elder User
Joined: Dec 2007
Posts: 971
Likes: 1
From: IA MN SD
Somebody else pointed out this little gem of a test. Might give this a go too. Then we should have the both injectors and HPO leaks covered.
Balloon Test
Balloon Test
FTE Stories
Ford Trucks for Ford Truck Enthusiasts
3 Best / Worst Features Of The 2025+ Ford Expedition
Brett Foote
10 Ways Ford is LOSING to the Competition
Joe Kucinski
Top 6 Best Deals Available on New Fords & Lincolns Right Now
Brett Foote
This Hennessey Takes the Expedition Tremor's Off-Roading Capability to the Next Level
Verdad Gallardo
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
Thread Starter
|
Elder User
Joined: Dec 2007
Posts: 971
Likes: 1
From: IA MN SD
Wrong regarding locations of cylinders 2 and 6. I've learned they're both on the left bank, which is good news.
Is that the allen screw I see in the middle of the HPO rail in this photo?
Is that the allen screw I see in the middle of the HPO rail in this photo?
Cargo Master
Joined: Mar 2007
Posts: 3,103
Likes: 32
From: AB/BC
I stand corrected about an injector letting combustion gas pass through the injector it's self into the fuel rail.Diesel Technician Society
Thread Starter
|
Elder User
Joined: Dec 2007
Posts: 971
Likes: 1
From: IA MN SD
A little more warning regarding removal of that setscrew in the HPO rail would have been nice. 
However, I lucked out. When the smoke cleared (i.e. I wiped the oil off my glasses so I could see), the little setscrew landed right on top of the oil rail about two inches from the hole. I had NO CLUE where that thing went after it popped loose. Hilarious, thinking back about it. However, I was extremely lucky that I was able to find it.
When I put shop air (>150psi) to the HPO system, it was quiet as a mouse. I heard no leaks whatsoever.
Got the balloon test done and #6 appeared to be the culprit. I wish I had used water balloons so they would have fit tighter around the fuel line. With the zip ties pulled as tight as I could get them, the balloon stayed limp on all cylinders, except on #6 it filled so that it wasn't limp anymore. Not an obvious leak, but a leak none the less. I have an injector on the way.
However, I lucked out. When the smoke cleared (i.e. I wiped the oil off my glasses so I could see), the little setscrew landed right on top of the oil rail about two inches from the hole. I had NO CLUE where that thing went after it popped loose. Hilarious, thinking back about it. However, I was extremely lucky that I was able to find it.When I put shop air (>150psi) to the HPO system, it was quiet as a mouse. I heard no leaks whatsoever.
Got the balloon test done and #6 appeared to be the culprit. I wish I had used water balloons so they would have fit tighter around the fuel line. With the zip ties pulled as tight as I could get them, the balloon stayed limp on all cylinders, except on #6 it filled so that it wasn't limp anymore. Not an obvious leak, but a leak none the less. I have an injector on the way.
Thread Starter
|
Elder User
Joined: Dec 2007
Posts: 971
Likes: 1
From: IA MN SD
Replaced #6 injector today. Running like a top again.
Learned a lot, including balloon test is easier than testing the HPO system for leaks so start there next time.
Thanks for everyone's help!
Learned a lot, including balloon test is easier than testing the HPO system for leaks so start there next time.
Thanks for everyone's help!