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On my way home today all of a sudden truck started running really rough, low power and a bad mis at idle. Got home, ran auto enginuity on it and found no codes. Ran cylinder contribution test and got P0263 cylinder 1 contribution/balance fault and P0269 cylinder 3 fault. I ran it a few times and P0275 cylinder 5 came up once also. Ran buzz test and all injectors sound the same. So im not sure, do i have an IDM going bad or and maybe a valve cover harness problem? Any Ideas?
A knock is another symptom of low fuel pressure. If you've got a way to check it, do so. If not, slowly drive out to a stretch of road where you can floor it. See if it falls on it's face when you floor it but does decent when you ease it around.
And be sure to check your oil level to rule that out.
That FIPW is wrong on so many levels. The last time somebody had all the same symptoms, I think it was the ICP. Pulling the ICP with no change may rule that out, but the FIPW should not be that low for any reason - 0.6 ms is "off" (sync signal), and the solenoids have difficulty operating correctly below about 1.3 ms. If that FIPW is accurate, the truck will run rough - if at all.
What did the FIPW and IPR do when you pulled the ICP connector?
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