Low oil pressure, only slight fluctuation with throttle - PerformanceTrucks.net Forums

Go Back  PerformanceTrucks.net Forums > GENERAL MOTORS SPECIFIC FORUMS > GMT 900 Trucks General Discussion
Low oil pressure, only slight fluctuation with throttle >

Low oil pressure, only slight fluctuation with throttle

GMT 900 Trucks General Discussion 2007 - 2013 Trucks | General Discussion

Low oil pressure, only slight fluctuation with throttle

Reply

Old 12-21-2017, 05:02 PM
  #1  
On The Tree
Thread Starter
iTrader: (1)
 
Join Date: Mar 2014
Posts: 177
Thanked 0 Times in 0 Posts
Default Low oil pressure, only slight fluctuation with throttle

Truck in question is a 2008 originally 5.3. It had some problems so I got a 6.0 l96 from a donor vehicle. The oil pressure was 40 at warm idle wile it was still in the donor, don't know how it reacted with throttle also don't know what weight oil it had. I got it swapped over and filled with castrol 5w30 now it only has ~25# at idle and only goes up to 30 with throttle causing the gauge display to show a oil light and low oil pressure.

It has a lsx 454 cam, new lifters, and new headgaskets. Dod/afm deleted. And new oil sending unit.
I've narrowed it down to one of 3 things.
Oil pump (pressure relief valve)
Or the rubber orings that seal the lifter towers (didn't want to drill for plugs due to obvious reasons and can't afford the fancy pop rivet tool to plug them)
And to me, the less likely, bearings as it had good oil pressure before being pulled with the only variable being oil viscosity.

Any one have any ideas as to what is more probable or other probabilitys?
LOWnEASY is offline  
Reply With Quote
Old 12-21-2017, 09:51 PM
  #2  
Launching!
iTrader: (13)
 
Join Date: Nov 2002
Location: Staten Island, NY
Posts: 212
Thanks: 0
Thanked 2 Times in 2 Posts
Default

I had a similar issue with the 5.3 in my wife's tahoe after I did the dod/afm delete. I bought the ligenfelter dod plug kit and my oil pressure went back to normal. I just used it on my 2007 silverado when I did the dod/afm delete and oil pressure is steady at 40 at idle.
Deezl SS is offline  
Reply With Quote
Old 12-22-2017, 09:04 AM
  #3  
On The Tree
Thread Starter
iTrader: (1)
 
Join Date: Mar 2014
Posts: 177
Thanked 0 Times in 0 Posts
Default

Wana rent the tool out? I can buy the plugs, it's the tool I don't want to pay $75 for and use once or twice over the years.
LOWnEASY is offline  
Reply With Quote
Old 12-22-2017, 04:55 PM
  #4  
On The Tree
 
swathdiver's Avatar
 
Join Date: Aug 2017
Posts: 185
Thanked 14 Times in 14 Posts
Default

The L96 does not have DOD/AFM. 25lbs at idle seems normal once warm. 25-30 while cruising below 2000 rpms is also normal.

So if you did take out AFM components from that engine, it was not an L96, maybe an L76?
swathdiver is offline  
Reply With Quote
Old 12-22-2017, 07:45 PM
  #5  
Tig
TECH Fanatic
iTrader: (2)
 
Tig's Avatar
 
Join Date: Dec 2005
Location: Earth
Posts: 1,620
Thanked 11 Times in 10 Posts
Default

Originally Posted by Deezl SS View Post
I had a similar issue with the 5.3 in my wife's tahoe after I did the dod/afm delete. I bought the ligenfelter dod plug kit and my oil pressure went back to normal. I just used it on my 2007 silverado when I did the dod/afm delete and oil pressure is steady at 40 at idle.
Is this the kit you got?
https://www.lingenfelter.com/product...l#.Wj2sq0xFzIU
Tig is offline  
Reply With Quote
Old 12-22-2017, 08:45 PM
  #6  
On The Tree
Thread Starter
iTrader: (1)
 
Join Date: Mar 2014
Posts: 177
Thanked 0 Times in 0 Posts
Default

Originally Posted by swathdiver View Post
The L96 does not have DOD/AFM. 25lbs at idle seems normal once warm. 25-30 while cruising below 2000 rpms is also normal.

So if you did take out AFM components from that engine, it was not an L96, maybe an L76?
It may not have dod/afm but it still has the lifter towers with the holes in them.
And 25 lbs is low enuff to make my oil light come on and my display read low oil pressure stop engine, altho I know it's not low enuff to hurt any thing it's just annoying seeing the lights on the dash.
LOWnEASY is offline  
Reply With Quote
Old 12-22-2017, 08:47 PM
  #7  
On The Tree
Thread Starter
iTrader: (1)
 
Join Date: Mar 2014
Posts: 177
Thanked 0 Times in 0 Posts
Default

Originally Posted by Tig View Post
Should be. That's the only kit I'm aware of. It's like $7X on summit. Pricy for a rivut gun. Wonder if the "rivet" plugs would work in a standard rivit gun?
LOWnEASY is offline  
Reply With Quote
Old 12-22-2017, 09:43 PM
  #8  
Tig
TECH Fanatic
iTrader: (2)
 
Tig's Avatar
 
Join Date: Dec 2005
Location: Earth
Posts: 1,620
Thanked 11 Times in 10 Posts
Default

Originally Posted by LOWnEASY View Post
Should be. That's the only kit I'm aware of. It's like $7X on summit. Pricy for a rivet gun. Wonder if the "rivet" plugs would work in a standard rivet gun?

That's exactly where I was going haha
Though the rivets do look pretty beefy
Tig is offline  
Reply With Quote
Old 12-23-2017, 12:12 AM
  #9  
On The Tree
 
swathdiver's Avatar
 
Join Date: Aug 2017
Posts: 185
Thanked 14 Times in 14 Posts
Default

That's correct but you mentioned that the AFM/DOD was deleted.

Hmm... Doesn't sound right, has the computer thrown a code P0521?
swathdiver is offline  
Reply With Quote
Old 12-23-2017, 03:10 PM
  #10  
TECH Fanatic
iTrader: (4)
 
Join Date: Jan 2011
Location: Bonnyville Alberta
Posts: 1,372
Thanked 13 Times in 13 Posts
Default

My 17 is an L96 and it only makes about 25 psi hot idle... never goes over maybe 55 pounds but once hot its likely below 50. Seems to be normal and on par with most others. As accurate as the factory clusters and sending units are it might be worth checking otherwise.
1994Vmax is offline  
Reply With Quote
Reply
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Hemi Killer
GM Engine & Exhaust Performance
6
05-09-2010 03:56 PM
WhySoSerious?
SHOW & SHINE DISCUSSION
16
05-15-2008 11:38 PM
NightmareTBSS
GM Engine & Exhaust Performance
1
06-21-2005 07:06 AM
Procharged LM7
GM Engine & Exhaust Performance
17
11-01-2003 03:24 PM
LS1csherm
GM Engine & Exhaust Performance
9
09-02-2003 11:48 AM


Thread Tools
Search this Thread
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: