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2000 7.3 no start issue in Dallas Tx

1343 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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Disconnect the IPR then try to start, the PCM will take care of the oil pressure. If then it runs, look for chafed wireing in the harness were it could rub, seems to be a common problem. You have to attain 500 psi oil pressure to fire the injectors, also the cranking has to be fast enough, watch your tach when cranking, should be 500 RPM or above. I assume your oil level is OK. These engines pump a hugh volume of oil, if it is real low you could be sucking air.
1 - 1 of 9 Posts
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