Question about 2001 GMC Jimmy

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Loose oil pressure when engine slows down

If I brake or slow down when driving, my oil pressure gauge goes down.

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That's normal in most cases, depending how low it goes. 40 psi approx when driving, 20 psi approx when idling ?

Posted on Jan 09, 2009

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Oil gauge goes down when i slow down or stop pressure gos back upwhen i sart driving


Ok so for the oil:

That is pretty normal for most cars but it shouldn't fluctuate too much. The oil pump is controlled by the engine rotating. Spin the engine faster and the pressure will increase. If you feel there is a problem, Connect a manual gauge and check it against the manufactures specifications.

What do you mean by rear heat? What kind of a vehicle is this?

Dec 12, 2013 | Cars & Trucks

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Oil gauge goes to 80psi while I'm driving 70mph on highway, drops when I slow down. Why?


They are designed to change as the motor changes speed. If you have 80 lbs. of oil pressure than you have very good oil pressure in your engine. If it gets higher than 80, I would talk to service dept. at your local dealer.

Jun 24, 2012 | 1997 Cadillac Catera

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The oil indicator is very low and when I speed up it goes up when I slow down it goes down and the chek gauges light comes up. It has plenty of oil how can I fix it


First thing you need to do is have the actual pressure verified by attaching a mechanical oil pressure gauge in place of the sending unit on your engine. If the gauge verifies your dash readings then you have an oil pressure loss inside the engine that needs further diagnosis (worn bearings, obstructed pump pickup etc). If pressure drops enough to turn the light on I would not drive it 'till you know exactly what's happening inside or you can and will have an engine failure.
One warning...if after you remove the pan, you find that the pump screen is not obstructed, Don't blame the pump for the low pressure.....check the bearings. However, regardless of what you find (obstruction or worn bearings) it is advisable to replace the pump. Pumps generally don't fail but ingesting debris (carbon or metal from bearings) will either score or wear the pump housing and vanes enough so that the pump will never reach full pressure.
If the external gauge shows normal pressure, contrary to what the dash gauge tells you, blow out the sender passageway and replace the sender, then add marvel oil at each oil change as it will help dissolve any crud accumulated inside the oil system.

Jan 23, 2011 | 2001 Jeep Grand Cherokee

1 Answer

Oil gauge goes down when I slow down I have a 2000 Jeep sport


If I'm understanding you correctly your saying your oil pressure drops way down when you slow down and idle but the pressure is fair to good when your running at speed. If this is the case I'm afraid I have to give you bad news, it's most likely your main bearings are shot and you will need to have your engine overhauled or rebuilt.

Jul 01, 2010 | 2001 Dodge Durango

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My oil pressure gauge goes to the H


Not really , when you give it gas it creates higher pil pressure at higher engine speeds, when the engine slows down there is less pressure on the oil.

Apr 03, 2010 | 2002 Jeep Grand Cherokee

2 Answers

Oil pressure gauge


A common problem is the pressure switch that is mounted on the camshaft position sensor on the left side of the engine while standing in front of the vehicle. This is the best thing that could be wrong and is most likely what is wrong. The worst thing is an internal pressure problem.

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2 Answers

1999 Astro chevy van oil gauge goes between 30 - 60 when i am driving 30 when i slow down and 60 when i sped up.


NORMAL JUMP AS THE ENGINE RPM INCREASES THE OIL PRESSURE GOES UP VERY FAST. I HAVE THE VAN, MY DOES THE SAME THING, U CAN TRY REPLACING THE OIL PRESSURE SENDER, BUT ONLY USE THE GM ORIG PART, AFTERMARKET ONES MAKE THE FLUCUATION WORSE..

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1 Answer

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The sensor could be failing to read the lower pressure when the engine RPM slows down. Or the pump could be failing. I would replace the sensor and see if that doesn't correct the problem

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1 Answer

Low oil pressure


Sounds like you have an internal engine problem. the only way to be sure is to check the oil pressure with an external gauge.

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