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Have a 99 7.3l with extended crank with no codes. If I turn key off for 30 seconds and try to start crank is extended. If I leave key on with engine off for 30 seconds engine fires right up. Have another 7.3l here compared readings and they are the same. I suspect HPOP but would like that comfirmed.
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No difference. It's 75 here today. Engine will start after extended crank but it's slow to build oil pressure. Like I said before if after running I turn engine off but leave key on the oil pressure drops slow and after 10 minutes it fires right up. If after running I turn engine off with key off after 30 seconds oil pressure drops to 0 psi and engine has extended crank.
Fleet Mechanic
Joined: Jan 2016
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So, if you leave the ignition on for a extended length of time it will start? Sounds more like a low fuel pressure issue to me. Check fuel pressure, it could be a weak low pressure fuel pump or clogged fuel filter. Leaving ignition on shouldn't affect oil pressure but it may be running fuel pump and letting it build pressure.
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Happy New Year. Yes fuel pressure is good. On my scanner I notice the high oil pressure takes a bit to build. What gets me is when turn engine off but leave key on I can let it sit for 30 minutes and it will fire right up. If I turn key off and let it sit for 30 seconds it has extended crank. It's like the oil is draining from rails. Doesn't make sense.
Postmaster
Joined: Nov 2015
Posts: 4,807
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From: Colorado Springs
Get a can of compressed air, The next time it does it, turn the can upside down and spray the IPR with the CO2. See if the truck starts up.
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I suspected the same but when compared to another truck the numbers were the same. So the IPR could be weak?
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