Oil Pressure - "Driving" me crazy - The 1947 - Present Chevrolet & GMC Truck Message Board Network

85Silveradoin04 · 11-18-2004, 07:10 PM

Need some feedback on some findings. When accelerating, my OP drops to 15-30 PSI. Under hard acceleration it will stay there a while until I reach cruise. No problems while cruising, 60 PSI like all normal. If I'm going 60 and I pump WOT, Oil pressure drops from 60 down to 30 PSI. I've even seen it get as low as ZERO from a stop but return to 60 once in cruising state. When I take turns or come to a stop, pressure will drop to 15 PSI. Anyone?

Yeah, it's got oil in it. Mobile 1.

cochran63 · 11-18-2004, 07:53 PM

Maybe the oil pickup fell off of the pump...

77gmcjoe · 11-18-2004, 08:05 PM

Or maybe the pickup screen is plugged?

SanitysBane · 11-18-2004, 08:31 PM

posibly its to low, thats what it sounds like to me anyways, but pick up screen could be it too

Jonboy · 11-18-2004, 09:45 PM

have you changed out the sending unit? I would try that first, as it would be easiest and cheapest.

MylilBowTie · 11-18-2004, 09:57 PM

Check the oil level, make sure its level. Buy a mechanical oil pressure gauge just to verify the findings. Could be the bearings are about ready to go but it could be other things. It could be a bad gauge, sending unit, wire connection or mechanical malfunction. Also it might be a good idea to pull the valve covers and check the oil returns. Then you will get to see more of what is going on after the valve cover comes off.

85Silveradoin04 · 11-18-2004, 10:22 PM

Quote:

Originally Posted by MylilBowTie

Check the oil level, make sure its level. Buy a mechanical oil pressure gauge just to verify the findings. Could be the bearings are about ready to go but it could be other things. It could be a bad gauge, sending unit, wire connection or mechanical malfunction. Also it might be a good idea to pull the valve covers and check the oil returns. Then you will get to see more of what is going on after the valve cover comes off.

Thanks all for the replys.

Being as the motor has less than 5k, I'd hope its not something such as the bearings. But we will see.

11-18-2004, 07:10 PM	#1
85Silveradoin04 Registered User Join Date: Jun 2004 Posts: 64	Oil Pressure - "Driving" me crazy Need some feedback on some findings. When accelerating, my OP drops to 15-30 PSI. Under hard acceleration it will stay there a while until I reach cruise. No problems while cruising, 60 PSI like all normal. If I'm going 60 and I pump WOT, Oil pressure drops from 60 down to 30 PSI. I've even seen it get as low as ZERO from a stop but return to 60 once in cruising state. When I take turns or come to a stop, pressure will drop to 15 PSI. Anyone? Yeah, it's got oil in it. Mobile 1.

11-18-2004, 07:53 PM	#2
cochran63 Registered User Join Date: Jan 2004 Location: Oklahoma Posts: 1,057	Maybe the oil pickup fell off of the pump... __________________ Youth soon passes away, but immaturity can last a life time.

11-18-2004, 08:05 PM	#3
77gmcjoe What do we get for $10? Join Date: Oct 2004 Location: Beardstown, Illinois Posts: 341	Or maybe the pickup screen is plugged? __________________ 1977 GMC K25 400/400/205 1989 Chevy Suburban R1500 350/700R4 (work beater) 1994 Chevy K3500 dually 454/4L80 1996 Corvette LT4 350/ZF 6 speed 2000 Bonneville SSEI Supercharged 3.8 Liter V6 1966 Chevelle 2 door sedan (Needs major repair )

11-18-2004, 08:31 PM	#4
SanitysBane Registered User Join Date: May 2004 Location: Lubbock, Texas Posts: 2,121	posibly its to low, thats what it sounds like to me anyways, but pick up screen could be it too __________________ '96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer

11-18-2004, 09:45 PM	#5
Jonboy Slots go on anything! Join Date: May 2003 Location: Richardson, TX Posts: 5,957	have you changed out the sending unit? I would try that first, as it would be easiest and cheapest. __________________ 1974 Jimmy- 5.3/4L80e/NP241

11-18-2004, 09:57 PM	#6
MylilBowTie Right turn Clyde Join Date: Nov 2002 Location: Cincinnati, Ohio Posts: 2,911	Check the oil level, make sure its level. Buy a mechanical oil pressure gauge just to verify the findings. Could be the bearings are about ready to go but it could be other things. It could be a bad gauge, sending unit, wire connection or mechanical malfunction. Also it might be a good idea to pull the valve covers and check the oil returns. Then you will get to see more of what is going on after the valve cover comes off. __________________ 1974 C25 LWB: 454 4bbl Carb / TH400 / 3.73 1992 Camaro RS 305 TBI



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