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 01-10-2006, 03:34 PM   #1
Prerunner1982
Registered User
 
Prerunner1982's Avatar
 
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,904
0 oil pressure??

ok this seemed to start last night, truck wasnt running all that well.. when it was in park it ran fine, about 30psi (no numbers just lines, ) oil pressure.. as soon as i would put it in drive oil pressure would drop to 0-15psi, when i was driving it would go back up to 15-30psi, but when i would come to a stop it would drop to almost 0 again. Also when i would come to a stop, RPMs would drop and truck would try to die. I limped it home...

Today i had to take my wife to work and daughter to school.. starts up and runs fine, oil pressure seems a bit higher, still dropped to about 0 when i put it in gear.. truck ran fine all day (drove it around town for about 4hrs) didnt try to die, idled fine in gear... later in the morning the Psi quit dropping, but didnt get much more than 20-30psi.

It has always run between 30-60.. depending if i was idling or doing 45+... now it wont get about 30psi.. any ideas? what is considered normal? does she need to be put out to pasture?
__________________
Jon
1982 Chevy Silverado 350/th350.... RETIRED
1993 Jeep XJ 2 door(Cherokee) 4wd 4.0ltr/AX-15 (5spd)/NP231
....
Oklahoma Roll Call
Prerunner1982 is offline   Reply With Quote
Old 01-10-2006, 03:44 PM   #2
Wrenchbender Ret
Registered User
 
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,229
Re: 0 oil pressure??

I take it you have checked the oil level. If it is overfull you could be getting gas in the oil & diluting it or a-freeze. If the oil looks OK you probably have a plugged up oil screen. If you don,t fix it real soon it will put itself out to pasture.
Wrenchbender Ret is offline   Reply With Quote
Old 01-10-2006, 03:57 PM   #3
SSC's76
No No
 
SSC's76's Avatar
 
Join Date: Jun 2005
Location: Pueblo Colorado
Posts: 1,781
Re: 0 oil pressure??

Mechanical or electric sending unit? I'd double check with another mechanical guage either way.
__________________
1976 Custom Deluxe SWB Med FMB.3/4 Drop.
Gen VI 454, Muncie HD 3 speed With Modified OE Hurst Shifter, 3.73 12 bolt, GMPP HO roller cam, Hooker headers, Performer intake with modified Q-jet, Accel distributor. Best 1/4 12.3 @108. Funnest run 19.84 @88 full 1/4 mile burn out.
1997 K1500 ext cab 5.7 stock except muffler
SSC's76 is offline   Reply With Quote
Old 01-10-2006, 04:36 PM   #4
Prerunner1982
Registered User
 
Prerunner1982's Avatar
 
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,904
Re: 0 oil pressure??

i will try the mechanical guage first..

plugged up oil screen? that on the oil pump in the pan?
Prerunner1982 is offline   Reply With Quote
Old 01-10-2006, 06:46 PM   #5
79BIG10
I'm back with 2nd truck!
 
79BIG10's Avatar
 
Join Date: Feb 2002
Location: Texas
Posts: 3,774
Re: 0 oil pressure??

Quote:
Originally Posted by Prerunner1982
i will try the mechanical guage first..

plugged up oil screen? that on the oil pump in the pan?
Yes it's on the pickup for the oil pump. If you have alot of sludge then it would cause low oil pressure.
__________________
1979 Chevrolet Bonanza Big10 "Tootsie Roll"
1985 Chevrolet Silverado (wife's)
Member of the Southern Bowties Club

"Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson
79BIG10 is offline   Reply With Quote
Old 01-10-2006, 04:37 PM   #6
86 GMG
Registered User
 
Join Date: Apr 2005
Location: Tulsa Oklahoma
Posts: 943
Re: 0 oil pressure??

have you checked your vac. lines to see if there is a bad one some where for it to just start running bad and then not running bad that would me my first thing to eliminate best luck
__________________
square body trucks an addiction or an investment either way they consume all my extra time and money
86 GMG is offline   Reply With Quote
Old 01-11-2006, 11:48 PM   #7
Prerunner1982
Registered User
 
Prerunner1982's Avatar
 
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,904
Re: 0 oil pressure??

ok well.. spent ALL day today working on it.. wife went to town to take kiddo to school and i started tearing into it.. luckily she was able to pick up some parts for me.. I found a few vac lines and replaced or plugged them.. I took the carb off and cleaned it. I checked a couple plugs i thought might not be firing well.. I pulled the cap and rotor and decided it needed to be replaced, i also added the mechanical pressure guage.. While i was waiting on the wife to get home with some parts i made a switch panel but didnt get around to finish it.. SOOOOO...... its fixed.. atleast it appears to be at the moment. Doesnt die now, run smoother and the oil pressure is at 20psi at idle and stops, up to 40psi when i am on it, and 60psi when engine is cold... does that sound about right? i also rewired a few things, apparently wasnt a good idea.. my tach now turns off when i turn the headlights on.. will work on that this weekend maybe.. i also fixed my stereo, which wasnt saving the presets.. all in all it was an eventful day, but i am sure worn out..
Prerunner1982 is offline   Reply With Quote
Old 01-12-2006, 02:34 AM   #8
Destructo
Registered User
 
Join Date: Sep 2003
Location: Lewisville, NC
Posts: 1,836
Re: 0 oil pressure??

Your oil pressure sounds fine now, 20 psi at idle is fine, 40 when driving is normal and I get about 60 when cold also.

I run 10w-30 I believe and get close to the same numbers on my 350.
__________________
1985 Scottsdale Shortbed 4x4
Stout 350 with some "upgrades"-700r4-33x12.5" Mud Tires, Warn 8274-50 winch.

2005 Chevrolet Colorado Regular Cab 2wd 4-banger, 5 speed, Street Pack with 3.73 axle.
Destructo is offline   Reply With Quote
Old 01-13-2006, 01:07 AM   #9
79BIG10
I'm back with 2nd truck!
 
79BIG10's Avatar
 
Join Date: Feb 2002
Location: Texas
Posts: 3,774
Re: 0 oil pressure??

Sounds like everything has worked out for you on the oil pressure side. The oil pressure you mentioned sounds good. Good luck with the wiring issue. Hopefully it will be an easy fix.
__________________
1979 Chevrolet Bonanza Big10 "Tootsie Roll"
1985 Chevrolet Silverado (wife's)
Member of the Southern Bowties Club

"Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson
79BIG10 is offline   Reply With Quote
Old 01-13-2006, 03:01 PM   #10
Prerunner1982
Registered User
 
Prerunner1982's Avatar
 
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,904
Re: 0 oil pressure??

ok i figured out the fix for the tach, no biggie..

however my truck was dying again this morning.. after a few miles it cleared and didnt do it again.. thinking maybe in the tank? or maybe float stuck? i dont know.. when its not dying it runs much better..
Prerunner1982 is offline   Reply With Quote
Old 01-13-2006, 07:33 PM   #11
MylilBowTie
Right turn Clyde
 
MylilBowTie's Avatar
 
Join Date: Nov 2002
Location: Cincinnati, Ohio
Posts: 2,911
Re: 0 oil pressure??

Does it smoke any when it is in the stages of acting up? Or does it just kinda loose power?

Maybe a weak fuel pump, filter sock in the gas tank?
__________________
1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73
1992 Camaro RS 305 TBI
MylilBowTie is offline   Reply With Quote
Old 01-14-2006, 02:16 AM   #12
79BIG10
I'm back with 2nd truck!
 
79BIG10's Avatar
 
Join Date: Feb 2002
Location: Texas
Posts: 3,774
Re: 0 oil pressure??

Definately sounds like a fuel delivery issue. I'm thinking start at the carb and work your way back. Check the floats, filter, pump then finally the tank. I'm thinking more towards a bad float or float setting.
__________________
1979 Chevrolet Bonanza Big10 "Tootsie Roll"
1985 Chevrolet Silverado (wife's)
Member of the Southern Bowties Club

"Don't underestimate how sexy a fat man who drinks to excess can be." Homer Simpson
79BIG10 is offline   Reply With Quote
Old 01-14-2006, 02:11 PM   #13
Prerunner1982
Registered User
 
Prerunner1982's Avatar
 
Join Date: Oct 2002
Location: Edmond, OK
Posts: 5,904
Re: 0 oil pressure??

filter by carb is good, that was my first thought when truck was acting up, so its good.. i did pull off carb and clean it up, but didnt disassemble it at all..

as far as smoking i havent been able to tell, my pipes dump underneath and it has either been dark, or i have been alone and usually just trying to keep the thing running.. you thinking it might be flooding it? or what? I was also thinking filter sock in tank maybe some sediment or something...
Prerunner1982 is offline   Reply With Quote
Reply

Bookmarks


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 09:03 AM.


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