So, after going to get a '96 7.3 extended cab two weekends ago,
noticed something odd after the trip, about 600 miles of towing right at 1,000* the whole way thanks to a headwind
I was at 2500 miles on my oil change before the trip,
a warm restart can have up to 4 seconds of cranking and the LPOP isn't getting oil that whole time (watching mechanical oil pressure gauge). After it starts, it surges to 900 rpm for just a moment, and then settles back down to normal 600.
Cold restart after like 4hours of cooling, it fires right up normally after a second of cranking.
Hot, 5-10 min wait: is almost a no start, mechanical gauge shows it sitting at 16-20 psi of oil the whole time after about 5-10 seconds of priming. Maybe 30 seconds of cranking or more, feels like forever.
Changed oil this morning, no change in this behavior, and now im worried... this is my work truck and now im chasing an issue
The motor was rebuilt about 20k miles ago due to the original owner dusting the engine down horribly, up to this point the engine has run just fine, hot or cold and hot/cold restarts
oil pressure hot is about 28 psi, 53 cruising, this has been the same before the trip, and after
unplugged ICP, performed restart, same rough start
unplugged engine oil switch in HPOP cover, same rough start
tin nut is tight on on the IPR, IPR is tight
Hoping someone with some prior understanding can chime in on this, but this sure seems like oil drainback/bypass to me, or heaven forbid the pickup tube cracked. I did check it before the rebuild and it looked perfectly fine, but that WAS 20k miles ago.
Im going to start by checking the check valves and drainback valves, then move to the LPOP Melling pump, glad i kept the OEM pump that had 68k on it now... hoping its just some trash that the heat dislodged and is jamming the bypass or checks open letting oil bypass
please help with any advice other than buy a chevy :3
THANK YOU!
noticed something odd after the trip, about 600 miles of towing right at 1,000* the whole way thanks to a headwind
I was at 2500 miles on my oil change before the trip,
a warm restart can have up to 4 seconds of cranking and the LPOP isn't getting oil that whole time (watching mechanical oil pressure gauge). After it starts, it surges to 900 rpm for just a moment, and then settles back down to normal 600.
Cold restart after like 4hours of cooling, it fires right up normally after a second of cranking.
Hot, 5-10 min wait: is almost a no start, mechanical gauge shows it sitting at 16-20 psi of oil the whole time after about 5-10 seconds of priming. Maybe 30 seconds of cranking or more, feels like forever.
Changed oil this morning, no change in this behavior, and now im worried... this is my work truck and now im chasing an issue
The motor was rebuilt about 20k miles ago due to the original owner dusting the engine down horribly, up to this point the engine has run just fine, hot or cold and hot/cold restarts
oil pressure hot is about 28 psi, 53 cruising, this has been the same before the trip, and after
unplugged ICP, performed restart, same rough start
unplugged engine oil switch in HPOP cover, same rough start
tin nut is tight on on the IPR, IPR is tight
Hoping someone with some prior understanding can chime in on this, but this sure seems like oil drainback/bypass to me, or heaven forbid the pickup tube cracked. I did check it before the rebuild and it looked perfectly fine, but that WAS 20k miles ago.
Im going to start by checking the check valves and drainback valves, then move to the LPOP Melling pump, glad i kept the OEM pump that had 68k on it now... hoping its just some trash that the heat dislodged and is jamming the bypass or checks open letting oil bypass
please help with any advice other than buy a chevy :3
THANK YOU!
Last edited: