Question about 1992 GMC Sierra

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Oil pressure is jumping from 20lbs to 0lbs,truck almost dies then the oil pressure jumps back up to 30lbs then back to 10lbs ,

Just recently my oil pressure seems to have been dropping a little bit but i didnt think to much of it until on my way the oil press. was at about 10-15lbs and while on the freeway and as soon as i got off the freeway the gauge srarted to jump all over the place to 5lbs press,then to 0lbs then to 30lbs then to 5lbs then 20lbs then 0lbs again and the truck started to run kind of funny, engine chittering and check gauges light would come on with decrease of oil press. then go back off with increase of pressure.

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David Ellis Rhea

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To start, take the vehicle to a dealer and ask them to screw an oil pressure gauge into the block hole and check your oil pressure whilst idling and while driving it.
I have a 1993 and it does the same thing, but the problem is only the gauge itself.
If it is actually having such oil pressure fluctuations, you may have a defective pump, a clogged pump filter screen, or a clogged oil filter.
God bless your efforts.

Posted on May 18, 2017


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SOURCE: I have a 2005 yukon

the whine is probably a bad bearing in the alternator or a idler pulley you can take off belt and crank up for a few seconds to see if noise goes away.if it does then it is in one of the pulleys i have seen a lot of these alternators make noise. your oil pressure will go up some when you rev up

Posted on Aug 25, 2008


Colin Stickland

  • 22485 Answers

SOURCE: Oil pressure reads high 40 to 60 psi, guage never flucuated this much before new engine

try another earth cable ?? straight to engine and chassis

Posted on May 30, 2009


  • 8 Answers

SOURCE: Is there a switch or relay that kicks on/off the

sounds like the battery has a dead cell in it. i would get a new battery.

Posted on Jan 31, 2010


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SOURCE: While my truck is running my oil pressure gauge

Replace the oil pressure switch, unless you apply an external switch to verify the gauge itself, but in many many cases, the switch is defective.

Posted on Apr 09, 2010

Testimonial: "Thanks, I just wanted to make sure I wouldn't blow my engine."

Jack Johnson

  • 209 Answers

SOURCE: oil pressure gauge is jumping

Sounds like you had better check your oil level before you have a knocking noise. If oil level is ok, change your oil pressure sender.

Posted on Sep 05, 2011

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