The 1947 - Present Chevrolet & GMC Truck Message Board Network







Register or Log In To remove these advertisements.

Go Back   The 1947 - Present Chevrolet & GMC Truck Message Board Network > 47 - Current classic GM Trucks > The 1973 - 1987 Chevrolet & GMC Squarebody Pickups Message Board

Web 67-72chevytrucks.com


Reply
 
Thread Tools Display Modes
Old 07-31-2014, 10:36 AM   #1
parrisc19844x4_468
Registered User
 
parrisc19844x4_468's Avatar
 
Join Date: Oct 2010
Location: Town of Summit, WI
Posts: 322
oil pressue pegged over 60psi

Ok guys, I just bought this 83 SWB and trying to fix a few lose ends. One is the oil pressure gauge / sensor pegging past 60psi. Just to be safe I put a new sensor on it, the bigger one that is suppose to be for gauges. Turned on the key, same thing oil gauge is pegged. So , I disconnected the brown wire from the gauge and turned the key back on, same thing, accept the truck would not start. So, I am thinking this is for the sensor that tells the fuel pump that there is oil pressure, so I plugged it back in and bingo, truck started.
What I know is that this 350 is from an 87 and may need two sensors. What is the best route for me to take. I know there is suppose to be a oil port above the oil filter, I looked but there is nothing installed there. Should I get another sensor, is so which one, Will I need to run a 2nd wire to the oil gauge? Seems like some rewiring may have to take place. I have a manual gauge, I could run the oil line from the port above the filter into the cab, I really don’t like the idea of oil up there.
Thoughts ?
__________________
2017 Silverado LTZ 6.2
1984 Scottsdale K10 - 468 700r 4x4 lwb
1978 GMC Sierra Grande K15 350 Soond to be 406 th350 4x4 swb
1968 GMC 20 305 V6 good ole wood hauler.

Good Fences make good neighbors
parrisc19844x4_468 is offline   Reply With Quote
Old 08-01-2014, 03:01 AM   #2
y5mgisi
Second Chance Program
 
y5mgisi's Avatar
 
Join Date: Jun 2006
Location: Portland, OR
Posts: 2,642
Re: oil pressue pegged over 60psi

Subscribed for answers.
__________________
90 Chevy Suburban 2500 5.3 swap/th400/np241/14bltSF/10blt.
77 C20 crew cab Silverado. 396/th400. In work.
y5mgisi is offline   Reply With Quote
Old 08-01-2014, 08:26 AM   #3
parrisc19844x4_468
Registered User
 
parrisc19844x4_468's Avatar
 
Join Date: Oct 2010
Location: Town of Summit, WI
Posts: 322
Re: oil pressue pegged over 60psi

Based on some testing my oil sensor is working ok, seems to be in my gauge cluster. Going to pull it out and see if the tan wire from the sensor is plugged into the correct location that the gauge cluster
__________________
2017 Silverado LTZ 6.2
1984 Scottsdale K10 - 468 700r 4x4 lwb
1978 GMC Sierra Grande K15 350 Soond to be 406 th350 4x4 swb
1968 GMC 20 305 V6 good ole wood hauler.

Good Fences make good neighbors
parrisc19844x4_468 is offline   Reply With Quote
Old 08-01-2014, 08:35 AM   #4
parrisc19844x4_468
Registered User
 
parrisc19844x4_468's Avatar
 
Join Date: Oct 2010
Location: Town of Summit, WI
Posts: 322
Re: oil pressue pegged over 60psi

BTW. My understanding the same tan wire will function for the Gauges and to satisfy the computer to allow the truck to run.

So, the pegging of the oil gauge must be pinned to the wrong place on the gauge cluster. The only way I know to check that is to pull the cluster, look for the tan wire on the pigtail and see what position it is plugged into, if the match, back to the drawing board.

By the way, to test your oil sensor, take your multimeter, set it to ohms, lower setting, find where the tan wire from the sensor goes to the block, poke the + prong into the block along side the tan wire and ground the - prong. You should still have a closed connections by meter shows a 1. Now start your motor, check it again, you should see about 80o. This told me my oil sensor is good.

Another test , disconnect the tan wire, turn the key on, if you see the oil psi pegged out again, your issue is in your gauge cluster.

I will post my findings in the cluster on Monday after I pull it out and check the pinning.
__________________
2017 Silverado LTZ 6.2
1984 Scottsdale K10 - 468 700r 4x4 lwb
1978 GMC Sierra Grande K15 350 Soond to be 406 th350 4x4 swb
1968 GMC 20 305 V6 good ole wood hauler.

Good Fences make good neighbors

Last edited by parrisc19844x4_468; 08-01-2014 at 08:59 AM.
parrisc19844x4_468 is offline   Reply With Quote
Old 08-01-2014, 08:55 AM   #5
bnoon
Registered User
 
Join Date: Jul 2012
Location: Des Moines IA
Posts: 1,250
Re: oil pressue pegged over 60psi

There may be nothing wrong with it if it has an aftermarket oil pump on it. I run over 60 cold and about 45-50 hot with my Summit Racing high volume pump with a small spring shim in it. If you don't want the higher pressure, remove the spring shim or drop to the next size down spring depending on the oil pump brand.
__________________
- 1981 Sierra 454, NV4500 swap
- 2006 Z06, 25k miles
- 1973 Nova - Project CarNova Virus on Youtube
bnoon is offline   Reply With Quote
Old 08-01-2014, 09:02 AM   #6
parrisc19844x4_468
Registered User
 
parrisc19844x4_468's Avatar
 
Join Date: Oct 2010
Location: Town of Summit, WI
Posts: 322
Re: oil pressue pegged over 60psi

Quote:
Originally Posted by bnoon View Post
There may be nothing wrong with it if it has an aftermarket oil pump on it. I run over 60 cold and about 45-50 hot with my Summit Racing high volume pump with a small spring shim in it. If you don't want the higher pressure, remove the spring shim or drop to the next size down spring depending on the oil pump brand.
True I have a high volume high pressure on my 454 and it runs over 60, but this one is a stock 350 with the stock oil pump. It should only be between 30-40 at idel.

and , I pulled the wire from the sensor to the gauge, the gauge still pegged without the motor running.
__________________
2017 Silverado LTZ 6.2
1984 Scottsdale K10 - 468 700r 4x4 lwb
1978 GMC Sierra Grande K15 350 Soond to be 406 th350 4x4 swb
1968 GMC 20 305 V6 good ole wood hauler.

Good Fences make good neighbors
parrisc19844x4_468 is offline   Reply With Quote
Reply

Bookmarks

Tags
gauge, oil, sensor


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

Forum Jump


All times are GMT -4. The time now is 07:16 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright 1997-2022 67-72chevytrucks.com