What is normal Oil Pressure - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

Reply
 
 
 
Thread Tools Search this Thread
Old 03-11-2009, 09:09 PM   #1
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Sep 2008
Location: Tampa Florida
Posts: 106
Thanks: 0
Thanked 0 Times in 0 Posts
QuickLTD is on a distinguished road
Default What is normal Oil Pressure

Hi everyone,
What is "normal" oil pressure on a naturally aspirated 96 SE (164,000 miles). My guage reads 40-41 when cold. As long as my temp stays in what I would consider to be an indicated 180deg (normal for this guage) I will maintain 39 pounds. One I get into traffic and the temp rises to 205ish the oil pressure drops to just above the red bar. Very seldomly while in drive and stopped it will bounce into the red setting off the "Oh Crap" buzzer. Natrually this is a bit problematic in the Florida heat. The pressure will rise when the temp goes down while driving. There are no unusual sounds coming from the engine.

Now I will say I have not set off the buzzer since last OCT when it was a lot hotter and I have noticed that all three small gauges tend to move together at times indicating I may have an issue there as well. Gernerally speaking I have learned from other cars that "normal" is different on every car and sometimes it'* better to look for changes in that "normal" rather than relying on the actual indicated number but oil pressure is nothing to take chances on.

Thanks,
Dean
QuickLTD is offline   Reply With Quote
Old 03-11-2009, 10:15 PM   #2
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

If your pressure was dropping that low you would hear things in the engine, such as valve tappet. I suspect a bad sensor or a grounding issue. You mentioned other gauges acting up. Take a look at this write up, it might be helpful.

https://www.gmforum.com/t278980/
Danthurs is offline   Reply With Quote
Old 03-11-2009, 10:51 PM   #3
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Sep 2008
Location: Tampa Florida
Posts: 106
Thanks: 0
Thanked 0 Times in 0 Posts
QuickLTD is on a distinguished road
Default

Thanks, I'll have a look at it tomorrow. LOL yeah I had 5.0 Mustangs so I know what no oil pressure sounds like..
QuickLTD is offline   Reply With Quote
Old 03-12-2009, 08:32 AM   #4
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

Another thing to consider is that our gauge aren't the most accurate. I have swapped sensors a few times and it'* sad how different they can read.

If you have the availability I would recommend using a mechanical gauge to check the pressure. That will give you the true reading and then you may be able to ignore the gauge.
BillBoost37 is offline   Reply With Quote
Old 03-12-2009, 10:40 AM   #5
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Sep 2008
Location: Tampa Florida
Posts: 106
Thanks: 0
Thanked 0 Times in 0 Posts
QuickLTD is on a distinguished road
Default

Bill,
Thanks for the reply. That factory guage accuracy issue is what I meant by this statement. " Gernerally speaking I have learned from other cars that "normal" is different on every car and sometimes it'* better to look for changes in that "normal" rather than relying on the actual indicated number " I had a Ford LTD that I "fixed" by doing just what you said and another car whos factory tach that lagged almost 800rpm behind the engine. Not good when your trying to shift for max power.

Where would I hook up the guage on one of these cars anyway. LOL I get half stupid when I look at this engine.
QuickLTD is offline   Reply With Quote
Old 03-12-2009, 11:00 AM   #6
DINOSAURUS BOOSTUS

Expert Gearhead
 
BillBoost37's Avatar
 
Join Date: Mar 2005
Location: Enfield, CT
Posts: 41,391
Thanks: 0
Thanked 0 Times in 0 Posts
BillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of lightBillBoost37 is a glorious beacon of light
Default

You would hook up on the oil filter adapter. This is the piece that the oil filter screws in to. On the back side of the motor facing the firewall there is a hole where the oil pressure sensor is located. Remove the sensor and use that hole.

Here'* a picture of the oil filter adapter in relation to the harmonic balancer and passenger axle.
Name:  IMG_1680.jpg
Views: 15
Size:  64.6 KB

And here is the actual hole where you would hook into for the gauge.
Name:  IMG_1668.jpg
Views: 12
Size:  78.7 KB
BillBoost37 is offline   Reply With Quote
Old 03-12-2009, 01:43 PM   #7
Senior Member
Posts like a 4 Banger
Thread Starter
 
Join Date: Sep 2008
Location: Tampa Florida
Posts: 106
Thanks: 0
Thanked 0 Times in 0 Posts
QuickLTD is on a distinguished road
Default

Great info thanks for including the pictures they helped alot. If I decide to keep an aftermarket guage wouldnt disconecting the factory guage make the car think it has zero OP? tripping the buzzer and "check guages" light? or do i need to make a T fitting and run factory and after market guages. I never had a car with a factory low OP warning system. I will probably use a good quality electric guage for ease of mounting anywhere on the dash.

I am still going to look at that ground bus and clean it up since that area seems to be problematic with these cars

Last edited by QuickLTD; 03-12-2009 at 01:47 PM.
QuickLTD is offline   Reply With Quote
Old 03-12-2009, 03:51 PM   #8
Member
Posts like a V-Tak
 
Join Date: Oct 2008
Location: Pittsburgh
Posts: 82
Thanks: 0
Thanked 0 Times in 0 Posts
Brando_is_DTF is on a distinguished road
Angry

What'* the sound you're talking about?

My car does the same thing; it will be around 40something PSI and drop to below the red line. I can't imagine the car would be running as fine as it is if the oil pressure was this low, I mean we've got to be talking about under 10 PSI, that'* what shows up on my gague. I just wanna know what the sound is so i can listen for it. But from inside the car I think it sounds fine.

I've suspected a bad sensor all along; It used to be just fine, until I took it to the mechanic once and they did something with the oil pressure; can't remember off the top of my head.

And, oh God is that beeping annoying.
Brando_is_DTF is offline   Reply With Quote
Old 03-12-2009, 04:23 PM   #9
Retired Senior Admin

Expert Gearhead
 
Danthurs's Avatar
 
Join Date: May 2006
Location: Sheboygan Wisconsin
Posts: 29,661
Thanks: 0
Thanked 16 Times in 13 Posts
Danthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to allDanthurs is a name known to all
Default

If you loose oil pressure your lifters will loose pressure and you will here the tapping from the slop, it will go tap tap tap, real fast.
Danthurs is offline   Reply With Quote
Old 03-12-2009, 04:26 PM   #10
Okie Hokie
Posts like a Camaro
 
tlsheff's Avatar
 
Join Date: Dec 2008
Location: Durant, Ok 74701
Posts: 1,107
Thanks: 0
Thanked 0 Times in 0 Posts
tlsheff is on a distinguished road
Default

think back to your childhood and the wonderful sound of a baseball card in the spokes to really get that genuine motor sound... well that sound is bad in a motor now lol
tlsheff is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Normal oil pressure psi ? Holden Pontiac 1 08-27-2015 10:55 PM
L67 normal oil pressure ? xbr733 2000-2005 3 10-20-2013 09:44 AM
Borderline Low Oil Pressure, Normal? Hans 1992-1999 23 05-14-2007 01:42 PM
Anyone know what is considered normal oil pressure for 3100? h1081dan Lounge 12 01-17-2006 12:50 PM
normal for a 93 ssei? high oil pressure mikey 1992-1999 5 09-25-2005 11:51 PM


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 Off
Refbacks are Off



All times are GMT -4. The time now is 02:11 PM.


We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.