lq4 question
Thread Starter
10 Second Club
Joined: Aug 2010
Posts: 4,465
Likes: 192
From: Harford Co. Maryland
lq4 question I hope this is the right section ?
Anywho...LQ4 was pulld from a 2004? Silverado due to no oil pressure even checked with a mechanical guage.Oil pump replaced and still nothing (maybe 10psi I was told) But otherwise no knocks or strange sounds.
What could it be ?
Is it worth anything ?
The reason I'm asking is I can get it for almost nothing and if it's an easy fix I'll build it for my ride (pic below)
__________________
Anywho...LQ4 was pulld from a 2004? Silverado due to no oil pressure even checked with a mechanical guage.Oil pump replaced and still nothing (maybe 10psi I was told) But otherwise no knocks or strange sounds.
What could it be ?
Is it worth anything ?
The reason I'm asking is I can get it for almost nothing and if it's an easy fix I'll build it for my ride (pic below)
__________________
GMs troubleshooting list for low oil pressure:
Oil pump worn or dirty.
Oil pump-to-engine block bolts loose.
Oil pump screen loose, plugged, or damaged
Oil pump screen O-ring seal missing or damaged
Malfunctioning oil pump pressure relief valve
Excessive bearing clearance
Cracked, porous, or restricted oil galleries
Oil gallery plugs missing or incorrectly installed.
Oil pump worn or dirty.
Oil pump-to-engine block bolts loose.
Oil pump screen loose, plugged, or damaged
Oil pump screen O-ring seal missing or damaged
Malfunctioning oil pump pressure relief valve
Excessive bearing clearance
Cracked, porous, or restricted oil galleries
Oil gallery plugs missing or incorrectly installed.
Last edited by Darkman; Dec 25, 2010 at 09:04 PM.
Thread Starter
10 Second Club
Joined: Aug 2010
Posts: 4,465
Likes: 192
From: Harford Co. Maryland
There was a new oil pump installed and no difference
Was hoping there might have been a easy fix that was common
I would have guessed the presure relief valve was stuck open but if a new pump was installed, I would lean towards a spun bearing or a torn oil pump o-ring (which may have not been replaced with the new pump. The wrong o-ring would give you about 10lbs of oil pressure at idle.
Unless you know that the previous owner shut it down as soon as he had a problem, the nlock is a now a rebuilder.
Unless you know that the previous owner shut it down as soon as he had a problem, the nlock is a now a rebuilder.
I had an issue similar to this... was just the oil pump O-ring, it looked fine but decided to replace it after i had checked/replaced everything else...
that is my guess.... but like stated befor... it could be alot of other things!!!
that is my guess.... but like stated befor... it could be alot of other things!!!
Joined: Aug 2007
Posts: 24,241
Likes: 89
From: Turnin' Wrenches Infractions: 005
If it only cost almost nothing I say **** it, take a chance. You could part it back out later if you had to and get your almost nothing back plus some hardly something to go along with it 
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