Oil pressure droping - LS1TECH

Log In 


Generation III Internal Engine 1997-2006 LS1 | LS6
Sponsored by:
Sponsored by:

Oil pressure droping

Reply
 
Thread Tools Search this Thread
Old 12-13-2008, 12:59 PM   #1
On The Tree
Thread Starter
iTrader: (6)
 
sickSS's Avatar
 
Join Date: Sep 2005
Location: GA
Posts: 107
Default Oil pressure droping

I've got a 02 SS I bought with most of the mods already done it's got a forged 347 from tsp w 5.3 heads and it's got a ported LS6 oil pump. When I start the car it holds about 60 psi and it slowly drops and after about 15 mins its down to 0 psi. I figure it's pumping all the oil out of the pan and the oil's not making it back to the pan. Anyone ever seen this problem before?

Thanks
Luke
sickSS is offline   Reply With Quote
Old 12-13-2008, 02:01 PM   #2
TECH Fanatic
iTrader: (3)
 
heavymetals's Avatar
 
Join Date: Mar 2006
Posts: 1,399
Default

How many quarts did you put in it?

If it was at least four, you would have oil all over the place if it wasn't making it back to the pan.

Sounds like your oil pump install is bad (o ring).

It is a common error/problem.
heavymetals is offline   Reply With Quote
Old 12-13-2008, 02:05 PM   #3
TECH Enthusiast
iTrader: (18)
 
Join Date: Feb 2004
Location: central east coast florida
Posts: 553
Default

how much oil and what thickness. bad o-ring would bleed pressure from the beginning I would think. To me it sounds like wrong oil or a bad pump. As the oil warms and thins, the pressure drops.
What oil is in the car and how much?
01350ss is offline   Reply With Quote
Old 12-13-2008, 02:41 PM   #4
11 Second Club
iTrader: (86)
 
the_merv's Avatar
 
Join Date: Mar 2006
Location: Arkansucks
Posts: 19,064
Default

Dont drive it until you figure it out.
the_merv is offline   Reply With Quote
Old 12-13-2008, 02:56 PM   #5
On The Tree
Thread Starter
iTrader: (6)
 
sickSS's Avatar
 
Join Date: Sep 2005
Location: GA
Posts: 107
Default

10w40 mobil 1 5quarts
sickSS is offline   Reply With Quote
Old 12-13-2008, 05:47 PM   #6
On The Tree
Thread Starter
iTrader: (6)
 
sickSS's Avatar
 
Join Date: Sep 2005
Location: GA
Posts: 107
Default

i did run some mobil 1 15w50 for a while a friend talked me into that
sickSS is offline   Reply With Quote
Old 12-13-2008, 06:18 PM   #7
TECH Addict
iTrader: (9)
 
OUTLAWZ RACING's Avatar
 
Join Date: Mar 2004
Location: COLUMBUS GA.
Posts: 2,730
Default

Hows the sending unit have u replace that? Oh dose it start to tick or knock when the oil pressure goes down?

Last edited by OUTLAWZ RACING; 12-13-2008 at 06:19 PM. Reason: hmmmm.......
OUTLAWZ RACING is offline   Reply With Quote
Old 12-13-2008, 08:00 PM   #8
On The Tree
Thread Starter
iTrader: (6)
 
sickSS's Avatar
 
Join Date: Sep 2005
Location: GA
Posts: 107
Default

I haven't replaced the sending unit, it does start to knock a little when the oil pres gets to 0psi.
sickSS is offline   Reply With Quote
Old 12-13-2008, 09:05 PM   #9
TECH Addict
iTrader: (9)
 
OUTLAWZ RACING's Avatar
 
Join Date: Mar 2004
Location: COLUMBUS GA.
Posts: 2,730
Default

Quote:
Originally Posted by sickSS View Post
I haven't replaced the sending unit, it does start to knock a little when the oil pres gets to 0psi.
Ohh... Dam Are you 100% sure there is nothing in the pan or the pickup is loose? What about the cam retainer I know if that is loose you will loose oil pressure. The only other thing is bearings. Oh what about the barbel by pass thing it may have come out.
OUTLAWZ RACING is offline   Reply With Quote
Old 12-13-2008, 10:11 PM   #10
TECH Senior Member
iTrader: (90)
 
01ssreda4's Avatar
 
Join Date: Aug 2007
Location: Turnin' Wrenches Infractions: 005
Posts: 21,403
Default

if its fine cold then drops off as the motor warms up i would suggest a pressure relief spring. i have had those exact same symptoms on another car i had. replace the pump.
01ssreda4 is offline   Reply With Quote
Old 12-14-2008, 03:20 AM   #11
11 Second Club
iTrader: (86)
 
the_merv's Avatar
 
Join Date: Mar 2006
Location: Arkansucks
Posts: 19,064
Default

I had a Pump fail on me, tore the whole Engine up..
the_merv is offline   Reply With Quote
Old 12-14-2008, 09:24 AM   #12
TECH Enthusiast
iTrader: (2)
 
itchygomey98's Avatar
 
Join Date: Oct 2003
Posts: 617
Default

I had a new pump from the dealership crap out after 1500 miles. The relief valve was stuck. I pulled the pump apart and the bottom of the relief valve had a bur around it. What a bunch of crap. Tear the front of the engine down and get a good look at things (cam retainer, pump, pump o ring, and the little freeze plug in the front) If nothing then I'd take the rear cover off and check the barbell out. Good luck with it.
itchygomey98 is offline   Reply With Quote
Old 12-14-2008, 01:23 PM   #13
10 Second Club
iTrader: (15)
 
DrkPhx's Avatar
 
Join Date: Nov 2001
Location: St. Michael, MN.
Posts: 4,515
Default

I agree with everyone else; don't drive or even start it anymore until the problem is fixed. It could be something as simple as the oil pump o-ring or something more serious. Either way, you will have to tear it down for an inspection.
DrkPhx is offline   Reply With Quote
Old 12-14-2008, 01:30 PM   #14
FormerVendor
iTrader: (64)
 
Join Date: Feb 2008
Location: Bakersfield, CA
Posts: 1,075
Default

Bad o-ring wont have good pressure when cold....

I personally would be swapping to a new oil pump and start back up with 20w50 in it and see what happens. Check for bearing material in the oil when you drain it
CalSpeedPerformance is offline   Reply With Quote
Old 12-14-2008, 01:34 PM   #15
TECH Enthusiast
iTrader: (28)
 
WYATT318MOPAR's Avatar
 
Join Date: Apr 2008
Location: Grayson, KY 41143
Posts: 593
Default

I vote bearing cam or main. I had a 5.3 do the same thing new pump fixed it for like 1 day right back to the same thing. My repair in the end pull the bastard out and install a 6.0
WYATT318MOPAR is offline   Reply With Quote
Old 12-14-2008, 02:00 PM   #16
11 Second Club
iTrader: (43)
 
98Camarod's Avatar
 
Join Date: Aug 2006
Location: Summerville, SC
Posts: 5,316
Default

Quote:
Originally Posted by sickSS View Post
I haven't replaced the sending unit, it does start to knock a little when the oil pres gets to 0psi.
I'd say its too late. You shouldn't let it run with 0 oil pressure. Thats got spun bearing written all over it. If it's started to knock, its only going to get worse and you have a bottom end knock now. I would have tore the front cover off and replaced the pump when you had the chance. Sounds like you will be doing a rebuild now.
98Camarod is offline   Reply With Quote
Old 12-14-2008, 04:39 PM   #17
On The Tree
Thread Starter
iTrader: (6)
 
sickSS's Avatar
 
Join Date: Sep 2005
Location: GA
Posts: 107
Default

it doesnt knock at all when it has anything above 0 psi im gona order a oil pump after christmas and try that. what pump would yall recomend?
sickSS is offline   Reply With Quote
Old 12-14-2008, 04:56 PM   #18
11 Second Club
iTrader: (43)
 
98Camarod's Avatar
 
Join Date: Aug 2006
Location: Summerville, SC
Posts: 5,316
Default

I have a melling 295, no problems for me.
98Camarod is offline   Reply With Quote
Old 12-14-2008, 05:41 PM   #19
TECH Senior Member
iTrader: (90)
 
01ssreda4's Avatar
 
Join Date: Aug 2007
Location: Turnin' Wrenches Infractions: 005
Posts: 21,403
Default

295 here also
01ssreda4 is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are Off



All times are GMT -5. The time now is 11:40 PM.