Question about 1990 GMC Sierra

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Oil pressure gauge problem

My oil pressure gauge goes all the way up whenever I start my truck up. Any ideas of what would cause this to happen?

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Try a new oil sending unit. The right way is to hook up a mechanical oil pressure gauge and see if it mimics what you OEM gauge is reading.

Posted on Jun 18, 2009

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Has 358000 miles, just had leaks repaired. Twice since my oil pressure gauge reads no pressure but not all the time? Why


1. Oil Pressure Gauge Not Working You will notice this happens when your oil pressure gauge is not reading, whether the engine is turned off, idle or running. Try to step on the gas to rev up the engine. If the oil pressure gauge still doesn't change its reading, your gauge is busted. It's best to replace it as soon as possible because you won't have any idea if your car is already overheating or not.
2. Oil Pressure Gauge Reading Too Low When your engine is idle, the oil pressure gauge will have a low reading. When the engine starts running or when you're already cruising or on the freeway, your gauge's reading should have increased. If it stays on a low reading, then you now your oil pressure gauge is broken.
3. Oil Pressure Gauge Reading Too High Another common oil pressure gauge problem is when your oil pressure gauge is reading too high when your engine is idle or when it's turned off. Rep

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ALTHOUGH MY DIPSTICK READS FINE, WHENEVER I PUSH ON THE BRAKES, MY OIL PRESSURE GOES DOWN TO 0 AND MY CHECK GAUSES LIGHT COMES ON


I would say that you are definitely low on oil pressure. The oil pump is usually located inside of the oil pan. Depending on what vehicle you have you might have to have the engine removed to access the oil pan to get to the oil pump. I know on a Cadillac Northstar engine you get 43 hours to do an oil pump.

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Oil Pressure Drops


Did the mechanic drive the truck with a mechanical gauge to check the pressure ? The engine bearings or oil pump could be worn enough to allow pressure to drop at idle after it warms up.

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I did a oil change a couple days ago on a 1997 Jeep Grand Cherokee Laredo. Runs a V6 4.0L. my oil pressure gauge is on 0 even tho i do have oil pressure nd the jeep is running fine. how do i reset the oil...


I would start by obtaining a new oil pressure sender unit at autozone or advance. These are screw out and screw in with a deep well socket easy install once you find the location. I would suspect the sender going awry before the gauge and the doing anything with the gauge will involve taking dashboard apart.

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The oil pressure gauge drops to zero for about 3 seconds, occasionally. I have noticed that it is usually while sitting at a stop light although it did happen once on a sharp turn while moving. When the...


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When the engine temperature is cold the oil pressure will climb depending on the RPM's. If I keep the RPM's below 1800, the oil pressure will remain at 3/4. If I go beyond 1800 RPM's with the engine block...


You need to have a mechanical test gauge hooked up to see if this is a false reading, this special gauge goes into the oil sender tap in the block and will let u know for sure if the pressure is to high cold, if it is the most common issues are wrong weight of oil, do u use oil heavier than 10W-30W? any other oil like 10W-40W will cause high oil pressure readings, the reason is the very tight rod and main bearing clearance's the engines now use, it is only about 1/2 the clearance of older engines, that is so the new fuel saving thin oils can be used.

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Oil pressure gauge increases from half to 3/4 when i accelerate, any ideas?


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