pressure specs for HPOP
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Junior User
Joined: Apr 2004
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pressure specs for HPOP
Anyone know the pressure specs for the HPOP. I hooked up my snap-on scan tool, with the 99 PSD at running temp, my readings were 460 to 490 psi at idle, fluctuating alot. At 2500 rpm i only got 1,150 psi. the readings were flucutating alot, is this the regulator or the pump its self that might be bad? Or are the readings within specs?
FTE Leadership Emeritus
Joined: May 2001
Posts: 13,653
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From: Cabot, Arkansas
It should be at least 500 at idle (around 1000 while cranking) and upwards of 2500 as you approach WOT.
I would try a IPR first since it's a lot cheaper and easier than the pump. Might also check or replace the ICP sensor since you were using a scan tool as opposed to a direct pressure reading.
I would try a IPR first since it's a lot cheaper and easier than the pump. Might also check or replace the ICP sensor since you were using a scan tool as opposed to a direct pressure reading.
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Junior User
Joined: Apr 2004
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also had 2 DTC, exhaust control valve, i have a exhaust brake though didnt know if thats why i had that DTC? And the other was low boost. If that valve is half opened would it cause the truck to run poorly and have low boost?
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Elder User
Joined: May 2004
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From: Forest Hill, MD
Yes if your EBPV is stuck partially open your truck will run poorly and will not make much boost. What type of exhaust brake do you have?
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thanks, i unpluged the sensor on the head got the diff. idle. Is the ipr valve sensor right above the valve itself? If so i unpluged it and the truck died. maybe then the valve? Can they be cleaned?
Postmaster
Joined: Dec 2003
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From: STEPHENVILLE,TX!!!!!
the ipr sensor is in the drivers side head at the front, the ipr is in the hpop pump the drivers side of the pump sticking out horizontally tward the back of the motor. if ipr is working it should die when unplugged. could be a wore out o ring in the ipr causing problem also