oil pressure gone funky - The 1947 - Present Chevrolet & GMC Truck Message Board Network

little girl · 08-22-2001, 01:24 PM

has anyone experienced this problem?

i have: '87 GMC K10, 350 Jasper crate engine (30K mi on engine & gagues), mechanical AutoPro oil pres gague, mechanical oil pump, truck only gets 'super' fuel, oil is religiously changed every 3K (mobile 1 & pennzoil filters)

problem: when sufficiently warm (190 deg), oil pressure drops when throttle applied. The faster I accelerate, the faster oil press drops - if I punch it, I have 0 oil pres until I release the throttle. When throttle is released (no matter how fast I'm going) the oil pres slowly climbs back up. Check Engine lights up for the duration of the period of 0 pres.

background: just changed oil 5 days ago, started the day i changed the oil. Oil is still full and clean, no gas smell, etc, no leaks. Just changed oil filter today to see if faulty check valve - no dice, problem still exists.

Has anyone ever experienced something like this? me & my mech are baffled, just doesnt make sense - trying to see if I can dig up some clues before I rip the oil pump out and call Jasper. Thank you gentlemen!

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many thanks guys!

little girl · 08-22-2001, 02:06 PM

sorry, might be a bit confusing: when I did the initial oil change, I changed the filter too. I replaced the 5 day old filter today.

**Captkaos** · 08-22-2001, 02:28 PM

Is it possilbe that you lost the pickup screen? Have you checked the back of the block where the guage is pressurized? It could have trash blocking the hole. Is the guage mechanical?

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Chris Lucas
1973 Chevy C-10
1975 Chevy Silverado
Captkaos Customs

little girl · 08-22-2001, 02:33 PM

thats a great suggestion, I haven't checked the screen yet and I will today.

yes, the dash gague is mechanical - unfortunately, until I get my mech's shop oil pres gague on it, I am compelled to trust it.

08-22-2001, 01:24 PM	#1
little girl Registered User Join Date: Aug 2001 Location: bogota, nj, usa Posts: 3	oil pressure gone funky has anyone experienced this problem? i have: '87 GMC K10, 350 Jasper crate engine (30K mi on engine & gagues), mechanical AutoPro oil pres gague, mechanical oil pump, truck only gets 'super' fuel, oil is religiously changed every 3K (mobile 1 & pennzoil filters) problem: when sufficiently warm (190 deg), oil pressure drops when throttle applied. The faster I accelerate, the faster oil press drops - if I punch it, I have 0 oil pres until I release the throttle. When throttle is released (no matter how fast I'm going) the oil pres slowly climbs back up. Check Engine lights up for the duration of the period of 0 pres. background: just changed oil 5 days ago, started the day i changed the oil. Oil is still full and clean, no gas smell, etc, no leaks. Just changed oil filter today to see if faulty check valve - no dice, problem still exists. Has anyone ever experienced something like this? me & my mech are baffled, just doesnt make sense - trying to see if I can dig up some clues before I rip the oil pump out and call Jasper. Thank you gentlemen! ------------------ many thanks guys! __________________ many thanks guys!

08-22-2001, 02:06 PM	#2
little girl Registered User Join Date: Aug 2001 Location: bogota, nj, usa Posts: 3	sorry, might be a bit confusing: when I did the initial oil change, I changed the filter too. I replaced the 5 day old filter today. __________________ many thanks guys!

08-22-2001, 02:28 PM	#3
Captkaos www.73-87chevytrucks.com Join Date: Dec 1999 Location: Birmingham, AL Posts: 6,935	Is it possilbe that you lost the pickup screen? Have you checked the back of the block where the guage is pressurized? It could have trash blocking the hole. Is the guage mechanical? ------------------ Chris Lucas 1973 Chevy C-10 1975 Chevy Silverado Captkaos Customs __________________ Chris Lucas 1973 Chevy C-10 1978 GMC Jimmy (2WD) - SOLD 1987 R10 twin turbo LS 1991 R3500 SRW CrewCab 1985 K5 diesel swapped project 1989 K5 2WD conversion w/ Vette susp Project Captkaos Customs 73-87chevytrucks.com

08-22-2001, 02:33 PM	#4
little girl Registered User Join Date: Aug 2001 Location: bogota, nj, usa Posts: 3	thats a great suggestion, I haven't checked the screen yet and I will today. yes, the dash gague is mechanical - unfortunately, until I get my mech's shop oil pres gague on it, I am compelled to trust it. __________________ many thanks guys!



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