The main problem was the O-ring on the oil pick up tube had hardened over time and allowed the oil pump to suck air at that joint. But at the same time I also replaced the oil pump and oil pan gasket. I paid around $900.00 for a local garage to do it and to me it was worth every penny. He had to go back and replace the oil pan gasket a second time because it was leaking. Now I am running 50-60 psi oil pressure, 40 min at idle. Wish I would of done this sooner! My truck has 270,000 now and I've got 1000 miles on this oil change. No leaks now. If your going to do it I would suggest doing pump o-ring and pan gasket. That 5.3 is a great engine and has lots of miles left.
Had the same problem with my 05. Changed the sending unit, still low pressure. Dropped the oil pan and changed the o ring in the pick up tube, problem solved.
35-40 idle. 60+ driving. Mine was worse when cold. The low oil pressure warning would come on. After warm up it was ok. But it kept getting worse. I tried the oil sending unit, different oil and filters. Still done it. Had a man tell me it was the o ring in the pick up tube. So we dropped the pan, cleaned everything which it was pretty clean, no gunk. Changed the o ring and has been perfect sense. It was driving me crazy! Lol
Danny where I live it's been getting into the low teens and single digits. My low pressure message comes on too but is ok after it warms up. I have 342,000 on mine so I will try the O ring this coming spring.
I'm having the same problem with my 05 Silverado and it has 265,000 on it. I have replaced sending unit and that changed nothing. I see a lot of people replacing the o ring on the pick up tube. I think I'm going to give that a shot.
I'm having the same issue with my '05 suburban and I've changed out the oil sender and still the same crap. Everything is pointing to the oil pump. What did you come up with?btw, I live in cold MN minus 20°. looks like you have a heatwave where you're at.
This engine was under warranty, shop took it in dropped the oil pan pulled the oil pump and cleaned and inspected it, reinstalled and still had the same issue... They were not able to figure it out and ended up putting a brand new engine in... probably not what you wanted to hear... I did do quite a bit of research and some solved it with a new oil pump rubber o-ring....
Just what I didn't want to hear. I could change out the oil pump, but with 192K on the motor it might be better if I just put in a new one. Dammit.. lol. I guess I'll be ordering a new motor. Lucky you still have a warranty. Mines long gone. Thanks. BTW did it tick at all?
@@justinh6974 After all the research and tests that me and a friend of mine did. It ended up being a one dollar part at the oil's pick-up tube. There's a o-ring at the top of the pick-up tube that was dry rotted. I replaced that and it took care of the issue. Yes, it was a pain removing the oil pan to get to it. In all it took about 3-4 hours in a cold garage and rolling around under the truck. Oh so much fun. Lol. I still have and drive the beast til this day, now with 350K on the odometer. Hopefully I'll get to see it up to 500K one day. Good luck with yours.
