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.

 

[scomis]

I doubt it has the new valve cover. I bought it from a friend last month and he mentioned that it has always used oil between changes and has used the same amount of oil since he bought it used with 40k miles. No visible smoke, but you can definitely smell and taste the oil burning when you stick your nose near the tail pipe.

I will need to change out that valve cover and look into the catch can. Thanks!

Do you recommend disabling the AFM with it being 175k miles? I don't notice any ticks or knocks. Seems to idle just a bit rough, but my friend gave me new plugs that he hadn't gotten around to installing, as it had been a while since they'd been changed.

Drove to work this morning. Had almost 60psi cruising when cold and dropped to about 40psi cruising when warm, so I think the oil change did the job.

I am hoping that what caused this whole fiasco was "testing out" the new motor mount after I replaced it. I got on it a few times and I doubt it had been driven like that for a long time. So I am hoping I just knocked some sludge loose and clogged up the oil filter. Maybe that is a thing, maybe it isn't?

 

[Doubeleive]

I doubt it has the new valve cover. I bought it from a friend last month and he mentioned that it has always used oil between changes and has used the same amount of oil since he bought it used with 40k miles. No visible smoke, but you can definitely smell and taste the oil burning when you stick your nose near the tail pipe.

I will need to change out that valve cover and look into the catch can. Thanks!

Do you recommend disabling the AFM with it being 175k miles? I don't notice any ticks or knocks. Seems to idle just a bit rough, but my friend gave me new plugs that he hadn't gotten around to installing, as it had been a while since they'd been changed.

Drove to work this morning. Had almost 60psi cruising when cold and dropped to about 40psi cruising when warm, so I think the oil change did the job.

I am hoping that what caused this whole fiasco was "testing out" the new motor mount after I replaced it. I got on it a few times and I doubt it had been driven like that for a long time. So I am hoping I just knocked some sludge loose and clogged up the oil filter. Maybe that is a thing, maybe it isn't?

did you run the old oil thru a seeve? or was there anything on the oil pan bolt tip? not sure if these come magnetic or not, I added a magnetic one to mine
hopefully that was all it was but if metal was in there that's not a good sign.

 

[scomis]

No, unfortunately I didn't have any time to do it myself and swung into jiffy lube after work, just to see if changing the oil might help.

 

[donjetman]

I doubt it has the new valve cover. I bought it from a friend last month and he mentioned that it has always used oil between changes and has used the same amount of oil since he bought it used with 40k miles. No visible smoke, but you can definitely smell and taste the oil burning when you stick your nose near the tail pipe.

I will need to change out that valve cover and look into the catch can. Thanks!

Do you recommend disabling the AFM with it being 175k miles? I don't notice any ticks or knocks. Seems to idle just a bit rough, but my friend gave me new plugs that he hadn't gotten around to installing, as it had been a while since they'd been changed.

Drove to work this morning. Had almost 60psi cruising when cold and dropped to about 40psi cruising when warm, so I think the oil change did the job.

I am hoping that what caused this whole fiasco was "testing out" the new motor mount after I replaced it. I got on it a few times and I doubt it had been driven like that for a long time. So I am hoping I just knocked some sludge loose and clogged up the oil filter. Maybe that is a thing, maybe it isn't?

There is a lot more to that TSB than just changing the valve cover.
and
The oil pump pickup o-ring is a must do item.

Proactive mx on your schedule? or reactive mx on the vehicles schedule? reliable ole vehicle? or?