Join Date: May 2011
Location: Frederick MD.
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Your symptoms do sound like a possible high pressure oil issue, and 03/04 trucks do have much more HPOP issues then later model year engines. The PCM needs at least 500 psi of ICP pressure before it will try and fire. While 800 should be enough to start I have seen some failed pumps cause some goofy readings. The other thing that might be causing low ICP pressure is another leak like a standpipe or dummy plug issue. I would start with pressurizing the high pressure oil system and checking for leaks. If none are found then suspect the HPOP.
If you had access to a scan tool I would tell you to watch ICP desired, ICP actual, and IPR% readings. ICP actual and desired should be reading the same. If you actual ICP pressure is much lower then desired, and you have a high IPR duty cycle%, then you definitely have a high pressure issue.
I'd kind of suspect it is the HPOP.... Just a best guess on my part though.