Oil pressure problems!!!!!!!

Ok here I go! I swaped a 6.0 to my 00sierra. When I started the truck and took it to get tunned my oil pressure was normal @40 or lil higher and when reved up it would jump to 60 or so. A couple of days after the tune my oil pressure started to drop when I would get to a stop sign or a light to about 20. So I thought that it was the oil pump so I swaped it to a melling 10296 with the stock replacement spring that comes with the pump. It's a high volume high pressure pump. I started the truck up a few days ago and the oil pressure at idel is about 30 sometimes 40 and when I rev it up it doesn't move. I also swaped the oil pressure sensor behind the intake and the cluster and still the same problem. What could it be? Any comments and help are highly appreciated thanks in advance!

have you changed the oil and filter?

Yeah I changed it already!

Since you changed pumps, I assume you checked the o-ring or replaced it.

Yes I replaced it. It came with two and I swaped it with the one that was in the kit.

Did you use the supplied thicker oring of the two

Yes the one that was the same size as the stock one. I think the other one was thinner.

Cut the oil filter open and see if it has any surprises inside (bearing material).

Quote:

---

Originally Posted by DBRODS

Cut the oil filter open and see if it has any surprises inside (bearing material).

---

^^^^I just didnt wanna say it

Ok ill cut the filter today. What do I look for? Metal shavings or bigger pieces?

[QUOTE="LaRojelia"LSX;483366]Ok ill cut the filter today. What do I look for? Metal shavings or bigger pieces?[/QUOTE

A small amount of metal is normal. If u see a lot uh oh. Bearing material is usually non magnetic, lead zinc copper alloy or something of the sort

Ok thanks man ill check that out today and let yall know.

Quote:

---

Originally Posted by "LaRojelia"LSX

Ok thanks man ill check that out today and let yall know.

---

Got any updates yet

I just opened the filter and the oil at the bottom of the filter was glittery but it was very fine glitter and a few chrome specs but I think those were from the filter. What do you think?

I meant that the chrome specs were from cutting the filter! Sorry I didn't specify. Another thing I just drove it to my buddys shop and the oil pressure was @40 all the way but never went past it even at full throttle.

I use a magnet to gather all of the magnetic debris. What metal the magnet wont pick up should be a copper color.

Yeah tried the magnet and it picked up the few lil specs that it had. I guess they were from the filter material when I cut it. So what now? Should I just drive it like that?

It would drive me nuts. I would have to check the oil pump o ring to make sure i didnt pinch it or something. But im weird like that

[QUOTE=cottontop11;483367]

Quote:

---

Originally Posted by "LaRojelia"LSX

Ok ill cut the filter today. What do I look for? Metal shavings or bigger pieces?[/QUOTE

A small amount of metal is normal. If u see a lot uh oh. Bearing material is usually non magnetic, lead zinc copper alloy or something of the sort

---

really? my lq9 stock motor had less than 10 k miles and hundreds of track passes and never showed metal powder or any signs of any type of metal in it.

Laroj, what type of oil you using? how many miles on that 6.0 ?

10w 30 castrol syntetic blend. And the motor has @ 60k. The stock 4.8 that came with the truck had 130k and was still running strong it had a small cam and bolt ons I treated it like shit and never gave me any problems. Why would this one be any different?

Cottontop11. I did check the o ring about 2 days ago. I had used my stock oil pan gasket when I first swaped the oil pump so I droped the pan again and put a new one and I checked the o ring and it was on there good.

Problem solved! Don't know how or what happened I took the truck to get retunned because I swaped injectors and put 4.11 gears and after the tune the oil pressure started working normal or at least better. So I guess its a mystery. Thanks for all the help....

It'll show itself soon enough. I hate it when things fix their self!

I know I'm not going to know what it was until it does it again and I find the problem. But until then ill be smokin them tires!!!!!