Join Date: Jun 2008
Location: Brampton, Ontario, Canada
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'03-'04 6.0L engines use an aluminum swash plate style pump with a curved discharge tube atop the pump that connects it to the branch tube via a quick connect fitting that is similar to the STC fittings of '05 and up engines. However, on '03-'04 engines the banch tube is secured to the rear of the engine block with a bolt that prevents any rearward movement, thereby eliminating any chance of a blowout failure that occurs on almost all '05 and up pre-STC fitting update engines.
To the OP, you likely have a high pressure oil system leak from the discharge tube d-ring and/or weak high pressure oil pump causing your issue. To pinpoint this would require monitoring ICP psi, ICP volts, ICP desired and IPR duty cycle under all the conditions in which the problem occurs, along with carrying out a high pressure oil system air test. Is this an early-build 2004 or late-build 2004 engine?
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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