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2000 7.3 no start issue in Dallas Tx

1342 Views 8 Replies 3 Participants Last post by  briancbk
Thanks in advance for reading this.

I purchased a non running truck. I have a replacement engine, but I would like to hear the old one run to verify the components that I need to re use are in working order. I have been playing around with it for a while, but now I need to get serious and get it done. The truck makes no attempt to start at all during cranking. The HPOP res runs dry during cranking. It has a new LPOP, cps, starter, and batteries. Fuel filter is new, and filter housing fills with fresh fuel. After cranking the engine and refilling the HPOP res multiple times, I purchased a new IPR. I turned the key to see what would happen and it started and ran immediately, even without filling the HPOP res. It ran very good for 30-45 seconds and then died again. It will not start back up. My thinking is that the new IPR was in a different position than the old one, and it allowed the high pressure oil to flow into the head and fire the injectors. I think this means my HPOP is putting out enough pressure for the engine to run, but the IPR valve is staying closed? What tells the IPR valve to open or close? Would this be the IDM?

The original problem with the engine was a turbo shaft failure probably due to high egt's. It is possible that metal from the turbo grenade has made its way into the intake and oil passages of the pedestal, but it sounded so good for that one minute. I would like to hear it one more time.

I paid a ford tech to come hook his scan tool up to it. It was a waste of 100 bucks. He told me the engine was shot and it needed to be replaced.

Any help is greatly appreciated.
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thank you for the reply. Any idea why it would start and run normally for 45 seconds right after the new ipr? There is no oil coming from the injector spouts during cranking, but there was when it was running.
OK, so the pcm and IDM are not the same thing right? I tried it again with an IPR from a running engine and it did the same thing. It started and ran again for about 30 seconds and then turned off. So something has to be sending the wrong info to the IPR and it lowering the pressure to the injectors. Any way to troubleshoot the pcm, or do you just replace it with a known good one? Tried cranking it again with the ICP unplugged and no change. Just cranks and cranks. the engine is spinning faster than my last 7.3, as it has a new starter and two new batteries. I am not seeing the tach needle move much, just a twitch. It has a new ford CPS in it.
thanks again.
The hpop has always run empty during cranking. ( since I have had the truck). overfilling the crankcase and a new melling high flow oil pump did not help.

I dont mind changing the engine to the replacement one I have. I just kind of wanted to make sure the IDM and PCM were good so I am not trying to figure out why the new engine wont start either. I just couldnt understand why it would run for a while even on an empty HPOP res after only changing the IPR.
Just for kicks, how do you test an HPOP? Should I cap the high pressure lines going to the heads one at a time to see if I have a problem in one of them? Can I do a manual pressure test with a gauge somewhere?
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