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My 95 jeep has 103k and has a pretty descent tap in. just recently the oil pressure shoots up to about 80 when driving then down to about 40 at idle.

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Could be a clogged lifter. i have fixed this manytime by adding a couple quarts atf to the engine oil and letting the car idle in the drive way for a while.Then change the oil.

Posted on Sep 30, 2010

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Posted on Jan 02, 2017

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1 Answer

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sounds like dirty oil clogged the oil pressure relief valve to me.
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Recently bought a jeep grand cherokee laredo 1994, it had been sitting for a year or so. When we got it started it is tapping a little, smoking alot, and gauge is showing zero oil pressure. I'm af


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My oil guage shoots up to 80 and stays there when i start my 1999 jeep grand cherokee


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Oil pressure gauge moves up and down how do i change the switch bsending info to the gauge?


There is a oil pressure sending unit that sends the information to the gauge,it just unscrews from the engine,look near the oil filter,it will be close to it.

Apr 25, 2010 | 1999 Jeep Cherokee

1 Answer

2001 jeep cherokee compression guage at 80


generally it turns outto be one of three things 1. bad sending unit (switch) 2. stuck pressure relief valve in pump (not often) 3. bad gauge head (less than not often)(rare). You can attach a mechanical gauge to the engine and read actual oil pressure (attaches right where sender screws in). That will tell you if the problem is inside the engine or in the gauge system. If it turns out to be inside the engine you can add Marvel oil...many times the problem will clear up in a few days.
Be aware though that very high pressures can cause the oil filter to split or the seal to leak.Most quality filters are tested to about 100psi.(no idea about cheap ones if the test them at all)

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1 Answer

While driving the oil pressure gauge sits between 60 and 65 psi but when i get on the gas it shoots up to 80 psi. When idling it sits on 40 psi.


When the engine is idling, the oil pressure is reduced. At fast idle (such as highway speed) it in increases. This is considered normal. If it goes higher than 80 or lower than 40...have it checked out.

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1 Answer

95 Jeep Grand Cherokee loud tapping the longer it runs


yep,but if its knocking the damage may already be done

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1 Answer

1998 Jeep Cherokee Oil Pressure Question


installation is pretty much tighten and plug in as described. if gauge goes to 0 with engine off u should be fine. 15psi idle 40 psi higher rpm is normal. it is possible new switch not as as sensitive as old.

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1 Answer

95 jeep wrangler: gauge indicates 0 oil pressure


Wire on oil sending unit may have fallen off or sensor itself may have gone bad. Check both. If engine has no tapping noises, likely it's not a pressure problem.

Jun 07, 2009 | 1998 Jeep Wrangler

1 Answer

99 dodge dakota. Oil pressure moves between 40 & 80.


Believe it or not....this is actually normal depending on which oil that you use. Some of the thinner oils will cause this to jump around and the thicker oils will make it jump around less. When you first start the truck the oil is thicker and will read a high psi then get lower with less rpm while the oil warms and then gets thinner then builds pressure again with more volume being put through the engine while you drive down the road hence going back up to 80 psi. This is typical winter issue with the Dakota's in general. I would only be concerned if the pressure bottoms out while driving or starting.

Thanks for using fixya!

Sincerely,

JC

Jan 15, 2009 | 1999 Dodge Dakota

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