Low oil pressure but no noise

[Leonard country]

I have a 04 yukon with 5.3 was told last owner tried everything to get rid of low oil pressure nothing helped. The low pressure warning is on but truck has no valve rattle ticking or knocking this is the newest thing I've ever owned and only thing with 5.3 always been a 350 guy any ideas

 

[Tonyrodz]

I have a 04 yukon with 5.3 was told last owner tried everything to get rid of low oil pressure nothing helped. The low pressure warning is on but truck has no valve rattle ticking or knocking this is the newest thing I've ever owned and only thing with 5.3 always been a 350 guy any ideas

Did you confirm oil pressure with a mechanical gauge?

 

[swathdiver]

I have a 04 yukon with 5.3 was told last owner tried everything to get rid of low oil pressure nothing helped. The low pressure warning is on but truck has no valve rattle ticking or knocking this is the newest thing I've ever owned and only thing with 5.3 always been a 350 guy any ideas

Did he replace the camshaft bearings? Does the oil pressure fluctuate at all?

 

[Fless]

Post up some details of the rig: mileage, etc., and a list of what "tried everything" means. What repairs or tests have been done?

Had a recent oil report by, say, Blackstone Labs or somewhere else?

 

[Bandit-66]

Did you confirm oil pressure with a mechanical gauge?

This would also be my first option I would do for now

 

[Dbeal82]

I have a 04 yukon with 5.3 was told last owner tried everything to get rid of low oil pressure nothing helped. The low pressure warning is on but truck has no valve rattle ticking or knocking this is the newest thing I've ever owned and only thing with 5.3 always been a 350 guy any ideas

I had a similar situation with my 6.0L. I changed oil pressure sensor and screen. Truck runs fine now. If that doesn't work, I have heard that it could be a bad o-ring on oil pick up tube.

 

[Fless]

I had a similar situation with my 6.0L. I changed oil pressure sensor and screen. Truck runs fine now. If that doesn't work, I have heard that it could be a bad o-ring on oil pick up tube.

Which is why I requested more detail. Without knowing what's been done, we can toss all sorts of suggestions out there. Need more info if help is wanted.

 

[rockola1971]

I suspect that the oil pressure gauge is wrong. If there is one thing a GM engine wont tolerate, its low oil pressure. Youll spin a rod or main bearing or throw a rod right out of the side of the block with low oil pressure. The valvetrain would sound like a sewing machine before it got that bad. Its not uncommon for the before mentioned screen to get plugged up at the oil pressure sending unit. Quick and easy check. Another common problem is incorrectly installed or just old and split oring on the oil pickup tube. Or of course a worn out oil pump.

 

[Tonyrodz]

The NBS don't have screens under the oil pressure sender, that's the NNBS.

 

[Joseph Garcia]

Welcome to the Forum from NH.

Lots of knowledgeable folks here who freely share their knowledge, experiences, and perspectives. Knowledge is power.

I hope that you will become a participating member in the Forum's discussions.

Pics of the truck, please.

You are already receiving sage advice from the knowledgeable folks on this Forum.