Question about 1991 Jeep Cherokee Limited

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Oil pressure gauge fluxuates

When driving long distances oil pressure gauge goes to o but moves as engine is accelarated tkink i need a oil pump where is the oil pump located on a 1991 jeep straight 6 4.0

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The oil pump is in the pan at the bottom of the distributor.

Posted on Feb 27, 2009

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Engine starts and sounds good after about 5 mins. oil pressure gauge starts to fluxuate and engine dies


If oil is full, replace oil pressure snsr/sender and recheck. You didn't post what kind of vehicle you have , many use the oil pressure signal to keep the fuel pump running

Mar 10, 2014 | Cars & Trucks

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95 jeep wrangler. 4 cyl engine. Oil gauge normal with engine idle but reads high if accelerate goes all the way up


Do you have under drive pulleys? If so, you can expect that to happen. It does not mean that something is wrong. You may have a high volume oil pump too. I have under drive pulleys on my Camaro and the oil pressure and voltage readings go up. I have never had a problem with that. I would worry when the oil pressure gauge does not move at all $$$$$$.

Aug 04, 2012 | 1995 Jeep Wrangler

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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

The oil pressure gauge goes from 0 to all the way up and the needle moves back and forth while driving it checked oil its good now its clicking underneath the car and it felt like the transmission was...


First we would need to know when this occurs. Asuming the oil level is at the full mark!. If the pressure goes up during acceleration and down at idle when engine is fully warmed up, then this is normal. An engine requires 10 psi of oil pressure per 1,000 rpm ( ex. 20 psi at 2,000 rpm, 25 psi at 2,500 rpm, and so on ) . If the gauge is moving back and forth erratically at idle , i would say the gauge is bad. If it drops to 0 while accelerating I would say your oil pump is bad. If from time to time it seems to work and other times it seems not to work, I would say the oil pressure sending unit for the gauge is bad. If the pump failed you would start to here a Knocking noise from the engine in a short period of time. Use the above scenario's to narrow down what it may be.

Mar 27, 2010 | 2005 Nissan Altima

1 Answer

2006 suburban oil pressure gauge fluxuating


Most likely it's the oil sending sensor, located beside the oil filter. You can change it, just be sure to have old newspaper or rags laying around the area where you will work, because a little oil will be lost. The part isn't expensive, for mine on a Ford Expedition was around $35 and took 5 minutes to change. Just un-plug the connector going to the sensor, and a larger wrench will be needed, large (7/8, 15/16) somewhere in that range of size.

Jan 06, 2010 | 2003 Chevrolet Suburban 1500

2 Answers

03 gmc envoy with 5.3 140000 miles. Oil pressure reading fluxuates between 0 and 40. When problem first started pressure read 80. When vehicle was new it stayed at midpoint (40) vehicle has plenty of oil....


There may be a loose wire or the gauge or sending unit may be going bad. The first thing I would do is to hook up a temporary oil pressure gauge, not using the old one at all. With this watch gauge while driving and see what readings you get. If the readings still jump around you have a pump that is getting weak and failing, If that is the case the pump should be replaced, but with high milage you may consider rebuilding the entire engine. If the readings stay normal start checking for a loose wire at gauge or sender. Then check sender, then gauge and replace as needed.

Oct 02, 2009 | 2003 GMC Envoy Xl

2 Answers

Oils pressure gauge fluctuates


check the oil viscosity,it might be too old(driven for toomany miles)..

if thats not ityou might need to get the oil preasure lubricating pump checked,and id suggest you do it fast or theres a lot of engine wear and tear.

Aug 05, 2009 | 1995 Jaguar XJ6

1 Answer

Oil pressure


i was having the same issue with oil pressure and i only had 55K on mine, i have since changed the cat and the exhaust manifold and the problem went away? might be a coiencedance but it makes since thinking like an exhaust brake would work

Jul 01, 2008 | 1997 Jeep Wrangler

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