Low/No Oil Pressure After new Oil Pump Install

[nadthomas]

When comparing your valley cover to the pic below does it resemble the one on the left(AFM Style) or right(no AFM)??

Right

 

[01FormulaTA]

Right

Well if that’s the case then your particular engine was not one of the early builds and does not have the AFM components...that being said the oil pressure relief valve is only required for AFM so you should delete it, although this may not fix your problem since it should never activate without AFM, unless it’s a faulty part and stuck open (M14x1.5 plug)...let us know how it turns out...curious to hear what the issue is and how you fix it...good luck

 

[nadthomas]

Well if that’s the case then your particular engine was not one of the early builds and does not have the AFM components...that being said the oil pressure relief valve is only required for AFM so you should delete it, although this may not fix your problem since it should never activate without AFM, unless it’s a faulty part and stuck open (M14x1.5 plug)...let us know how it turns out...curious to hear what the issue is and how you fix it...good luck

The pan originally had an oil pressure relief valve so I replaced it (again just to avoid potential future issues), but I was just reading tonight as well that it can simply be blocked off. If I end up dropping the pan, I will simply plug it. I am really suspect of the valley cover o-rings being the source of the problem. Are you sure the non-afm valley cover has them?

 

[01FormulaTA]

The pan originally had an oil pressure relief valve so I replaced it (again just to avoid potential future issues), but I was just reading tonight as well that it can simply be blocked off. If I end up dropping the pan, I will simply plug it. I am really suspect of the valley cover o-rings being the source of the problem. Are you sure the non-afm valley cover has them?

Yes...the purpose of the O-Rings is to block off the AFM Oil Ports, stick with OE GM Parts....O-Ring Part# 12610160 (you will need 8)

 

[nadthomas]

Yes...the purpose of the O-Rings is to block off the AFM Oil Ports, stick with OE GM Parts....O-Ring Part# 12610160 (you will need 8)

THANKS!!!! I really hopeful that this is the source of my problem(it makes a lot of sense), and kind of exactly the small oversight I was hoping someone would school me on. At the very least I can spend Christmas day thinking I have a cheap and easy solution.

 

[kbuskill]

Yes...the purpose of the O-Rings is to block off the AFM Oil Ports, stick with OE GM Parts....O-Ring Part# 12610160 (you will need 8)

Correct me if I'm wrong but I think I remember reading about some guys blocking those passages with threaded plugs.

Not sure if they are already threaded or if that is something they did but I do seem to remember that.

 

[iamdub]

Correct me if I'm wrong but I think I remember reading about some guys blocking those passages with threaded plugs.

Not sure if they are already threaded or if that is something they did but I do seem to remember that.

Not already threaded. You have to tap the towers then screw in socket head set screws. There's even a tool and special rivets for this job cuz some people don't wanna risk getting metal shavings in the oil passages when tapping the towers.

 

[savila5305]

THANKS!!!! I really hopeful that this is the source of my problem(it makes a lot of sense), and kind of exactly the small oversight I was hoping someone would school me on. At the very least I can spend Christmas day thinking I have a cheap and easy solution. [emoji106]

I also had a low pressure issue on my 05 tahoe, i replaced the oil pump 2 days ago with a gm oem pump thinking the melling pump i had installed 3 years ago was bad. Come to find out when i go to turn on the tahoe i still had really low pressure, so i decided to remove the pan and found the pick up tube screen was clogged with what im suspecting is some sort of mesh/paper from the ac delco oil filter i was using.
I still have the truck on jacks since the dealership/auto parts store is closed on christmas.
Hope this helps. Good luck.

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[thompsoj22]

I also had a low pressure issue on my 05 tahoe, i replaced the oil pump 2 days ago with a gm oem pump thinking the melling pump i had installed 3 years ago was bad. Come to find out when i go to turn on the tahoe i still had really low pressure, so i decided to remove the pan and found the pick up tube screen was clogged with what im suspecting is some sort of mesh/paper from the ac delco oil filter i was using.
I still have the truck on jacks since the dealership/auto parts store is closed on christmas.
Hope this helps. Good luck.View attachment 212875

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WTF? Geez i sure hope that isnt from a OE authorized filter! I use the ACDELCO PF48E. Im 59 and have never seen a pickup tube screen plugged with filter media before. That is absolutely unacceptable, send the pic to GM and see if they reply? Not for compensation but for an answer as to if this is occuring with that brand of filter.

 

[donjetman]

WTF? Geez i sure hope that isnt from a OE authorized filter! I use the ACDELCO PF48E. Im 59 and have never seen a pickup tube screen plugged with filter media before. That is absolutely unacceptable, send the pic to GM and see if they reply? Not for compensation but for an answer as to if this is occuring with that brand of filter.

There's no way. I have been cutting open oil filters for 40+ yrs and all oil filters have a metal perforated tube in their center. The folded filter media is wrapped around this tube. Oil flows from the outside, thru the media, thru the little holes in the center tube, then out of the filter and back into the engine. Now if the filter starts bypassing because the media is clogged, then all bets are off, but the media couldn't make to the pickup in large pieces. You would have big problems if something has clogged the filter media that badly.
My guess would be that someone has been in the engine before and left that debris in there.

 

[iamdub]

...I have been cutting open oil filters for 40+ yrs and all oil filters have a metal perforated tube in their center.

Except, at least, for the ACDelco E-core filters.

Even still, I'd have to see the filter cut open to see if there's and damaged or missing filter media. I'd probably also have that gunk from the pickup screen analyzed.

 

[savila5305]

^^ I have no idea, my guess was just that something from the filter broke loose and made it to the screen. I tried looking for the filter i took out to open it up but i probably threw it away last week.

This is what was on the sceen. Im the only one that does the maintanance on it since i got the truck 14 years almost brand new.

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[donjetman]

Except, at least, for the ACDelco E-core filters.

I have to admit, I've never owned or cut open an E-core filter, I did a quik search and they do seem to be inferior and problematic.

Since their introduction, I try to only use Fram XG oil filters. When cut open it's easy to see that they are well built, like they're designed to take a 50 cal round

On my drag race engines I use the Wix R series. They don't filter as well, but they're less restrictive. Drag race engines get the oil changed often and have hi volume oil pumps.

 

[savila5305]

Im having trouble uploading the image..
I just finished putting the truck back together and have good pressure now..

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[iamdub]

I have to admit, I've never owned or cut open an E-core filter, I did a quik search and they do seem to be inferior and problematic.

Since their introduction, I try to only use Fram XG oil filters. When cut open it's easy to see that they are well built, like they're designed to take a 50 cal round

The engineers may find that the E-cores are perfectly fine, but they don't give me the warm and safe feeling I get from the Fram XG (only Fram I'd buy) or WIX/Napa Gold.

 

[kbuskill]

I can almost say with certainty that stuff didn't come from a filter.

The oil leaves the oil pan/pump and goes through the filter before being pumped through the oil passages and bearings of the engine. If that stuff left the filter it most certainly would have plugged a bearings oil passage and destroyed a bearing long before it made it back to the pickup screen in the pan. IMO

 

[nadthomas]

Well .....back on topic. I got the intake manifold pulled and the valley cover off this evening. I totally did not replace the o-rings in the valley cover, and they are pretty well compressed. I was hoping to see more signs of oil spay in the valley, or on the bottom of the cover. There was a little oil residue there, but its also been a couple of days since it was last ran, so its hard to say. It was actually cheaper to buy a new valley cover with o-rings then just buying new o-rings at $4-8 each. I should have them on Friday.

 

[swathdiver]

Im having trouble uploading the image..
I just finished putting the truck back together and have good pressure now..

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So what was that stuff; shop towel?

 

[nadthomas]

01FormulaTA nailed. I replaced the valley cover orings and now I have lots of oil pressure. I'm glad I swapped to the lower pressure spring on the Melling 10355 oil pump. I'm seeing about 65-70psi at idle now.

01FormulaTA if you ever find yourself in the Columbus area I'll buy you a beer or 10.

 

[swathdiver]

01FormulaTA nailed. I replaced the valley cover orings and now I have lots of oil pressure. I'm glad I swapped to the lower pressure spring on the Melling 10355 oil pump. I'm seeing about 65-70psi at idle now.

01FormulaTA if you ever find yourself in the Columbus area I'll buy you a beer or 10.

That's great news!