Help!!! 06 Denali with 5.3. Using a ton of oil and occasional pressure drop. Figured it was the valve cover and possible guage/sending unit. Had mechanic change Valve cover and immediately after driving away pressure dropped and the warning popped up on the dash. Brought back to mechanic and he assumed it was a bad gauge. He called me this morning and said it was the oil pump and the engine is getting no oil pressure after warmup. If that was the case, wouldn't i have noticed the issue before the valve cover change? Am i getting hosed? He's a new mechanic i've started using, but has always been honest and fair with his prices.
OIL PUMP???
- Thread starter jblancarte
- Start date
Texan
Member
- Jan 14, 2014
- 622
Scroll down and read this info about a small filter under the oil pressure sender.
Engine code p0521 - Ask the GM Technician - GM-Trucks.com
Engine code p0521 - Ask the GM Technician - GM-Trucks.com
Thats what i told him to check.... i hope he did that before pulling the oil pan! Would there be any reason why this would happen after the Valve Cover replacement and not before?
IllogicTC
Member
- Dec 30, 2013
- 3,452
Texan said:
Did you save that link from when I posted it to that other guy?
Good call Texan
the other dude was also experiencing really crappy oil pressure, that small filter getting cleaned made all the difference and if you're willing to do it yourself it's cheap/free to do.Finally confirmed engine is losing pressure. Filter screen below sensor looked brand new when I took it out. Hooked up mechanical guage and I'm getting 9-14 psi at idle when engine is warm. Any other thoughts before I load this up with 20 weight and Lucas and drive it until it explodes!!!
IllogicTC
Member
- Dec 30, 2013
- 3,452
jblancarte said:
We were trying to start with the free/cheap stuff first, which is where the screen came from. It was worth a shot at least.
Now I'm beginning to suspect it is indeed the oil pump, assuming your oil is of correct weight, not contaminated, and the proper amount is in the engine.
im going through this problem now, the truck has an extended service plan but i need to shell out the $1800 to dismantle the engine to find the bad pump. Could it be the relief spring in the pump hanging open? i find it hard to believe this happens so much and the pump is truly bad when its probably and accompanying part.i need help asap. i cant afford that kind of money.
IllogicTC
Member
- Dec 30, 2013
- 3,452
oh05ext said:
Have you first checked the built-in oil filter? Not sure if it's on all the 5.3s or just ones with the DOD, but here's an article on it:
Engine code p0521 - Ask the GM Technician - GM-Trucks.com
the trucks at the dealer now, im leaning towards it just being the bypass spring on the side of the pump but who knows.ill let them know about that though