Lost oil pressure
Thread Starter
3rd Gear
Joined: Sep 2019
Posts: 3
Likes: 0
From: St.Louis
Lost oil pressure
Hello I have a 1999 C5 coupe manual transmission, Thompson Motorsport heads, comp cam and supporting mods. Tonight I was doing a pull at the track, Car did fine all the way up to 120 Mph and I let out and coasted, didn’t hear anything weird from engine then engine loped out, I tried re starting, it started up sounded like it didn’t want too but finally did, oil pressure was at 5-7 psi now though when driving would get up to about 15-19 psi but then when coasting engine would shut off, I got it turned back on for the second time and limped it home. Now waiting till Monday to get in in to the shop, any ideas what this could be though? Thanks Jonas
Oil Producer
Joined: Apr 2014
Posts: 9,365
Likes: 2,734
I just picked up my first C5. My first LS one. I’m no specialist but aren’t there three things that can cause this? Failed oil pump/stuck with the bypass valve open, worn out bearings or Spun bearings, faulty pressure sensor. subbed to hear what shop says
Drifting
Joined: Jul 2011
Posts: 1,599
Likes: 398
From: Boise, ID
2022 C5 of the Year Finalist - Modified
2021 C5 of the Year Finalist - Modified
C5 of Year Finalist (appearance mods) 2019
Mileage on pump? Would drain oil, cut filter and look for shavings. If there is debris, plan on tear down. If oil and filter were clean would be looking at the pump.
Melting Slicks
Joined: Feb 2001
Posts: 2,803
Likes: 357
From: Northville, MI
There was a silent recall on the early oil pumps (99-00 as I recall). I started mine up, when I as 300 miles from home, and had zero pressure. Fortunately my daughter/sun-in-law had there Corvette there on a trailer and I drove theirs home. Chevy dealer said oil pump was bad but the replacement was covered. The was in 2002 on my 2000 Corvette with 14000 miles and a month out of warranty.
Race Director
Joined: Mar 2004
Posts: 12,466
Likes: 886
From: Fort Wayne IN
2025 C5 of the Year Finalist - Modified
C5 of Year Finalist (performance mods) 2019
2017 C5 of the Year Finalist
2016 C5 of the Year Finalist
2015 C5 of the Year Finalist
Hello I have a 1999 C5 coupe manual transmission, Thompson Motorsport heads, comp cam and supporting mods. Tonight I was doing a pull at the track, Car did fine all the way up to 120 Mph and I let out and coasted, didn’t hear anything weird from engine then engine loped out, I tried re starting, it started up sounded like it didn’t want too but finally did, oil pressure was at 5-7 psi now though when driving would get up to about 15-19 psi but then when coasting engine would shut off, I got it turned back on for the second time and limped it home. Now waiting till Monday to get in in to the shop, any ideas what this could be though? Thanks Jonas
