0 oil pressure?? - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Prerunner1982 · 01-10-2006, 03:34 PM

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?

Wrenchbender Ret · 01-10-2006, 03:44 PM

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.

SSC's76 · 01-10-2006, 03:57 PM

Mechanical or electric sending unit? I'd double check with another mechanical guage either way.

Prerunner1982 · 01-10-2006, 04:36 PM

i will try the mechanical guage first..

plugged up oil screen? that on the oil pump in the pan?

86 GMG · 01-10-2006, 04:37 PM

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

79BIG10 · 01-10-2006, 06:46 PM

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.

Prerunner1982 · 01-11-2006, 11:48 PM

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..

Destructo · 01-12-2006, 02:34 AM

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.

79BIG10 · 01-13-2006, 01:07 AM

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.

Prerunner1982 · 01-13-2006, 03:01 PM

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..

MylilBowTie · 01-13-2006, 07:33 PM

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?

79BIG10 · 01-14-2006, 02:16 AM

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.

Prerunner1982 · 01-14-2006, 02:11 PM

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...

01-10-2006, 03:34 PM	#1
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,906	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

01-10-2006, 03:44 PM	#2
Wrenchbender Ret Registered User Join Date: Oct 2005 Location: Overland Park, Ks. Posts: 5,206	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.

01-10-2006, 03:57 PM	#3
SSC's76 No No 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

01-10-2006, 04:36 PM	#4
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,906	Re: 0 oil pressure?? i will try the mechanical guage first.. plugged up oil screen? that on the oil pump in the pan?

01-10-2006, 04:37 PM	#5
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

01-11-2006, 11:48 PM	#7
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,906	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..

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.

01-13-2006, 01:07 AM	#9
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,775	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

01-13-2006, 03:01 PM	#10
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,906	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..

01-13-2006, 07:33 PM	#11
MylilBowTie Right turn Clyde 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

01-14-2006, 02:16 AM	#12
79BIG10 I'm back with 2nd truck! Join Date: Feb 2002 Location: Texas Posts: 3,775	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

01-14-2006, 02:11 PM	#13
Prerunner1982 Registered User Join Date: Oct 2002 Location: Edmond, OK Posts: 5,906	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...



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