Bad HPOP?
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Laughing Gas
Joined: Sep 2007
Posts: 869
Likes: 5
From: Near Shenandoah Valley
Bad HPOP?
My buddy's '01 450. 3-4 year old Swamp's injectors. No power, sometimes, most of the time.
Autoenginuity says Inj Pressure 465 with oil temp 174* and at 2900 RPM the inj Pressure is at 1425-1440.
on the road the 14' 450 will not get out of it's own way.
There are #3 and #8 inj codes with contribution test.
Pressures were much higher a couple years ago, before and after the injector swamp.
"FYI" Truck has a 6 position chip and we found out plow jockeys were turning the chip up plowing snow, do not know it that contributed to this problem.
Are we looking at a tired HPOP?
Autoenginuity says Inj Pressure 465 with oil temp 174* and at 2900 RPM the inj Pressure is at 1425-1440.
on the road the 14' 450 will not get out of it's own way.
There are #3 and #8 inj codes with contribution test.
Pressures were much higher a couple years ago, before and after the injector swamp.
"FYI" Truck has a 6 position chip and we found out plow jockeys were turning the chip up plowing snow, do not know it that contributed to this problem.
Are we looking at a tired HPOP?
Got Data?
Joined: Dec 2012
Posts: 4,239
Likes: 1,369
From: Lake Stevens, WA
Great that you have numbers from the scanner. Are the readings taken with the chip in stock or disabled mode? Good to eliminate that possible affect.
How does the ICP connector look when you pull the pigtail? Any oil in it? Sometimes it can fail that way.
A WOT run with RPM, ICP, and IPR duty cycle would be good to see.
Is the IPR tinnerman nut snugged down tight?
contribution test codes on #3 and #8 are common with certain CPS's. Shouldn't be an issue.
How does the ICP connector look when you pull the pigtail? Any oil in it? Sometimes it can fail that way.
A WOT run with RPM, ICP, and IPR duty cycle would be good to see.
Is the IPR tinnerman nut snugged down tight?
contribution test codes on #3 and #8 are common with certain CPS's. Shouldn't be an issue.
Got Data?
Joined: Dec 2012
Posts: 4,239
Likes: 1,369
From: Lake Stevens, WA
The guys will chip in here for you. It's been awhile since I've had my rig.
That IPR duty cycle reading at 2900RPM might tell us if the PCM is asking for plenty of ICP, in which case we might have leaking O-rings on the injectors, IPR or a weak HPOP, assuming the ICP sensor is good.
Any oil leaks in the engine valley? They would have to be pretty substantial to affect ICP, but sometimes the HPOP hoses develop leaks (sometimes dramatically).
That IPR duty cycle reading at 2900RPM might tell us if the PCM is asking for plenty of ICP, in which case we might have leaking O-rings on the injectors, IPR or a weak HPOP, assuming the ICP sensor is good.
Any oil leaks in the engine valley? They would have to be pretty substantial to affect ICP, but sometimes the HPOP hoses develop leaks (sometimes dramatically).
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