Join Date: Jun 2008
Location: Brampton, Ontario, Canada
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Your IPR valve is an actuator that is controlled by the PCM supplying constant, fused B+ through the red wire with the key in the RUN or START position, and duty cycled ground through the yellow with red stripe coloured wire. It COMMANDS a given duty cycle based on other inputs to the PCM (APP for example) under various engine operating conditions. If you can monitor ICP psi actual and ICP desired along with IPR duty cyle % under the conditions when your ICP is too low, it will tell you most of what's happening. In answer to your question, the only way to verify the IPR is functioning correctly is either to swap in a known good IPR from another '03/'04 truck to "try" to see if it corrects the condition, or do a high pressure oil system air test. Supply power and ground to the IPR to close the valve to see if the air sound changes. I realize and appreciate that it is a royal PITA to air test a 2003 engine, and quite frankly if it will increase to 3000 psi at WOT in PARK or NEUTRAL but fall flat on its face under load under points squarely at a weak HPOP.
As far as others suggestions regarding the y-pipe, I highly doubt that's your issue because it would be very obvious if you had a leak.
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Ford Diesel/Senior/Master Tech who placed 2nd overall in Ontario on the Fix-It-Right-First-Visit score for 2010
....who works at a dealership that now employs SOME half decent looking female employees since they overhauled most of the administrative staff
....but STILL loves hot women with big boobies
....and STILL hates working on E-Series with 6.0L