Intermittent oil pressure loss

[scomis]

I was wondering about that, but the intermittent nature of my issue made me wonder if that could be it. So, if I can check it and the analog pressure stays up, then probably not o-ring issue?

 

[scomis]

So I drove home from work and after about 15 mins of driving, the pressure started to get down about 10psi. So I revved it to 3000-3500 and it came back up again and stayed for a while. So I did that every time it dropped and then it stayed at a lower but reasonable level. So I ended up running to jiffy lube for a cheap conventional oil change to see if maybe the filter (less than 1000 miles on it) was clogged. Left jiffy Lube and the pressure is back to totally normal all the way home. Cautiously optimistic!

 

[rdezs]

Sounds very typical of the oil pressure relief valve in the oil pan getting weak, or the pressure relief valve in the oil pump.

 

[scomis]

Drove it for another couple 20 minute drives and the pressure remained correct. Now just need to try it tomorrow morning when it is below freezing to see if it still responds the same!
Hoping I don’t have to try to drop the pan or change the pump anytime soon!

Thinking about putting a range device in to see if that helps with the oil consumption and maybe future oil pressure loss issues?

 

[ckeister]

Watching this thread as I have similar symptoms. But I have changed the oil pick up tube, o-ring, Melling HV oil pump, VVT bolt/solenoid, cam thrust plate, and pressure sender. I think my cam bearings are shot or have one or more beginning to walk out. Thats the only thing that makes sense in my head at this point

 

[donjetman]

Drove it for another couple 20 minute drives and the pressure remained correct. Now just need to try it tomorrow morning when it is below freezing to see if it still responds the same!
Hoping I don’t have to try to drop the pan or change the pump anytime soon!

Thinking about putting a range device in to see if that helps with the oil consumption and maybe future oil pressure loss issues?

here is a GM Technical Service Bulletin (TSB) that applies to your vehicle. Has it been done?
https://f01.justanswer.com/ebrock63...il+Consumption,+MIL+ON,+Engine+Runs+Rough.pdf
Install a catch can on the driver side pcv line prior to doing the TSB.