1987 Oil pressure gauge acting strangely - The 1947 - Present Chevrolet & GMC Truck Message Board Network

72Blazerod · 02-11-2019, 02:11 AM

When I start the truck up the oil pressure gauge seems to work fine, but as it warms up the gauge starts dropping, eventually going all the way to zero. The truck seems to run fine and the temperature gauge didn't rise at all (as I would have expected if I had zero oil pressure). I'd like to hook up a mechanical oil pressure gauge to the engine to check the pressure, is that possible on a 1987? Any ideas as to what's going on?

Cheers

**Palf70Step** · 02-11-2019, 09:43 AM

Sounds like the sending unit is fubar.

Redneck Rydes · 02-11-2019, 10:57 AM

When I start my 85 my oil pressure gauge pegs all the way to the right, amd stays there till i shut the engine off, any ideas?.

**Palf70Step** · 02-11-2019, 11:14 AM

Quote:

Originally Posted by Redneck Rydes

When I start my 85 my oil pressure gauge pegs all the way to the right, amd stays there till i shut the engine off, any ideas?.

My guess is same thing, sending unit is bad or wrong.

02-11-2019, 02:11 AM	#1
72Blazerod Registered User Join Date: Feb 2000 Location: Vancouver, B.C., Canada Posts: 127	1987 Oil pressure gauge acting strangely When I start the truck up the oil pressure gauge seems to work fine, but as it warms up the gauge starts dropping, eventually going all the way to zero. The truck seems to run fine and the temperature gauge didn't rise at all (as I would have expected if I had zero oil pressure). I'd like to hook up a mechanical oil pressure gauge to the engine to check the pressure, is that possible on a 1987? Any ideas as to what's going on? Cheers __________________ 1987 GMC Suburban 1/2 ton 4x4 (Beater) 1998 GMC Suburban 2500 4x4 1972 Olds 442 Convertible 2006 GMC 2500 Duramax Crew Cab (Sold) 1972 Blazer 4x4 (Sold)

02-11-2019, 09:43 AM	#2
Palf70Step State of Confusion! Join Date: Jul 2002 Location: Gulfport, MS USA Posts: 46,665	Re: 1987 Oil pressure gauge acting strangely Sounds like the sending unit is fubar. __________________ Bill 1970 Chevy Custom/10 LWB Fleetside 2010 Toyota Tacoma PreRunner SR5 Double Cab - DD Member of Louisiana Classic Truck Club (LCTC) Bill's Gallery Life isn't tied with a bow, but it's still a gift. Live simply. Love generously. Care deeply. Speak kindly. Leave the rest to God!

02-11-2019, 10:57 AM	#3
Redneck Rydes Registered User Join Date: Feb 2016 Location: Trenton,Ontario & South Carolina Posts: 755	Re: 1987 Oil pressure gauge acting strangely When I start my 85 my oil pressure gauge pegs all the way to the right, amd stays there till i shut the engine off, any ideas?.



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