Question about 1997 Jeep Grand Cherokee

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Oil pressure gauge falls to o pressure when idling

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Depending on mileage, there could be several causes.

If it is high mileage there is a good chance that the oil pump is worn or the oil pick-up screen is plugged with sludge. Low oil pressure is also caused by bearings being worn. If it is low mileage this is probably not the case.

There is also a chance that the oil pressure sending unit (sensor) is bad, thus causing false readings.

Posted on Sep 06, 2009

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Need to know how to test oil flow on my merc sn# 0G298881. Thanks


no way to test oil flow as the system is sealed
however you can check oil pressure and that will indicate the oil flow from the pump
as pressure is a product of flow against restriction, low oil pressure indicates high flow rates with no restrictions or low flow rates with no restrictions
use a mechanical gauge , get the oil pressure specs and check the pressures at idle and then again at around the 2500 rpms mark
if the pressure falls within the specs then the oil flow will be correct

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Oil pressure drops when im at lights,but goes back up when i go,no knocking noises,n regular oil changes,what should i do


First hook up a mechanical pressure gauge to get a true reading--you may just have a bad sender. If pressure is less than 10 to 15 psi at hot dead idle, tell us how many miles on engine--what oil you are using--how often you change it. I have sometimes gone up one notch on thickness of oil on worn engines and run them many more miles.

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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

Oct 24, 2015 | 2001 GMC Yukon XL

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Why my oil pressure raises while idle, then falls when engine is reved


Likely electrical issue or bad fuel pump which draws excessive amps when reving up thus blowing fuse and creating drain on electrics making oil gauge reading drop.

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Oil guage falls when you come to a complete stop while still in drive?


It is normal for oil pressure to lower when engine is idling, but if it drops too much, it could be a worn pump. To check, have a shop hook up a mechanical oil pressure gauge and get the true oil pressure. Manufacturers often have a minimum pressure spec at idle and then at a higher rpm, also. Have your pressure checked against the manufacturer's specifications.

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I have a S10 Chevy my oil pressure gauge going s back and forth 40 & 60 driving stopping somethings below 40


Could be normal.
Idle RPM pressure is lower than say 2000 RPM
You could replace the sending unit or have the actual pressure checked with a mechanical gauge.

Jul 06, 2012 | Chevrolet Cars & Trucks

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Oil pressure guage intermitently falls to zero when idling. The dashboard "check gauge" light comes on. Has happened on three different occasions out of about 20 driving excursions. When it isn't happening...


My jeep also has started doing this. I replaced the oil pressure sensor. Sensor on the 4.7 is above the oil filter, follow the wires, typicaly is a 1 1/16 socket.

Dec 28, 2009 | 1999 Jeep Cherokee

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Is it normal for the oil pressure gauge on a 2009 2 litre MX 5 to fall close to the L mark whilst idling when hot?


No there is a problem take it to the dealer you are under warrenty get it check right away. Could be a bad gauge but also could be a problem with the oil pump or a leak somewhere.

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Oil Pressure drops but returns when i restart


your engine needs flushed .what is going on is idle has less pressure than driving and the sump is picking up dirt and debris but when you turn off or idle the debris falls off the sump.

Mar 12, 2009 | 2001 Chrysler Voyager

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When i come into a complete stop the oil gauge goes down.


If it's your oil pressure gauge, that is usually normal. The pressure will rise and fall with the RPM's of the engine, since the oil pump runs off of the engine itself.

Do you have a CEL coming on when it does that? If so, got to Autozone or Advanced, and get the codes from it, and myself or someone on here can help you fix it.

Dec 04, 2008 | 1999 Chevrolet Silverado 1500

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