Question about 2001 Jeep Grand Cherokee

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Oil Pressure Gauge Drops to zero when Idle and there is some oil leaking

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  • Jeep Master
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Low oil pressure can and will destroy your engine. Check the oil level. If it's full or just a little low (1quart or little lower) then you have a serious problem already. If it is lower than a quart and a half, re-fill it and check pressure. If it's OK, then find the leak and fix it. If after filling it pressure does not return to normal then you already have a serious problem. have the actual pressure checked with a mechanical gauge and proceed from there. (likely bad bearings) If main bearings are involved, unless you remove the engine and re-grind the crankshaft and clean out the oil passages, you are wasting your $. Usually cheaper to replace the engine and more reliable as well.

Posted on Feb 01, 2010

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Posted on Jan 02, 2017

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SOURCE: 02 jeep grand cherokee 4.7 eng

Hook up a manifold gauge (mechanical temporary use gauge, used by mechanics) and test the oil pressure. You probably need to replace the gauge. The computer sends info through a printed circuit board behind gauge cluster and sometimes you have to replace the whole gauge cluster.

Posted on Feb 06, 2009

  • 255 Answers

SOURCE: oil pressure gauge drops to zero when

This has an electric pressure gauge with a sending unit. Try this: When at idle, SLOWLY increase the engine speed. If the needle on the pressure gauge all of a sudden leaps to a pressure (like 'real quick') and acts normally with even faster engine speeds, the sending unit is bad. (It is just not reading the lower pressures.) Zero engine pressure will manifest itself in a bunch of knocky sounds and lifters that aren't pumping up and therefore "ticking" loudly. You probably don't have that since you didn't mention these problems.
Replace the sending unit after the above test and you should be fine.

Posted on Nov 24, 2009

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SOURCE: 02 cherokee losing oil pressure when accelerating, fine at idle.

Was the sending unit an aftermarket part?We like to install the original part back into most vehicle, but because of people price shopping, this can cause some issues. If the switch is working properly, the gauge should rise as the engine RPM's increase as you stated. With the key on and the engine off, disconnect the sending unit wire and ground it. The gauge should go to the highest reading, and that checks the wire, and the gauge. I suspect that the sending unit is failed or not the proper one for your vehicle.

Posted on Jan 07, 2010

vetteman3002
  • 2299 Answers

SOURCE: oil pressure gauge drops to

If your oil pressure is dropping to zero at an idle, then I would quit driving the vehicle. It is very possible that the engine is low on oil. Or that the oil pump is going bad. If you continue to drive the vehicle, you could ruin the engine. There is a oil pressure sending unit that could be bad. But if the oil pressure goes up when it is above an idle, then the sending unit is probably ok.

Posted on Jan 10, 2011

  • 1311 Answers

SOURCE: I have been having intermittent

It sounds like the oil pressure switch has failed. It is only an on/off switch that trips at about 15 - 17 PSI, the reading displayed on the dash is created by the computer based on the pressure switch being closed and the engine RPM.

Posted on Aug 04, 2011

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1 Answer

My check gauges light is on, oil hands goes over to zero, moves up, light goes off, when it drops back to zero, gauge light comes back on.


Well the warning light is supposed to come on if any of the gauges display a dangerous condition, such as no oil pressure.
You may have a faulty sending unit for the gauge, or a wiring problem, or the engine may actually be loosing oil pressure when the gauge drops.
You could replace the sending unit as a test, or have someone check the oil pressure with a mechanical gauge.

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2 Answers

The oil pressure drops to zero at idle. The pressure goes to normal when the car is moving. Is there a problem with the oil pump?


at idle ,what regulates oil pressure ,is the clearence, in the pump, itself, off idle the relief valve, ,regulates ,pressure, let me know if you have a pump,put in it, pull the old pump, apart, see if the spring for the relief ,,bypass, valve is broken, i have had a few ,issues with ,gm, pumps,

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I have been having intermittent problems with my '04 Trailblazer oil pressure gauge. Recently, when I am stopped at a light, or sitting idle, the oil pressure gauge drops to zero. Then, when I get...


It sounds like the oil pressure switch has failed. It is only an on/off switch that trips at about 15 - 17 PSI, the reading displayed on the dash is created by the computer based on the pressure switch being closed and the engine RPM.

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1 Answer

Alrighty. I've asked this a few times before, I have more info now. CHEVY 350 K1500. 1993. Replaced intake gaskets, (bad oil leak) dropped a small amount of coolant in with oil while doing so. Changed oil...


how did you clean the gasket off of the head? if you used a sanding disc the grit will eat up the bearings. are you reading pressure with a mechanical gauge? you have replaced all bearings??

6 psi @ 1000 RPM
18 psi @ 2000 RPM
24 psi @ 4000 RPM
this is chevrolet specs on oil pressure in your truck so you are within the range.

describe your idle problem more and i will try and help you with that

Feb 02, 2011 | 1993 Chevrolet K1500

1 Answer

Oil pressure gauge drops to zero at idle. Do I have a switch or senzor and where is it?


If your oil pressure is dropping to zero at an idle, then I would quit driving the vehicle. It is very possible that the engine is low on oil. Or that the oil pump is going bad. If you continue to drive the vehicle, you could ruin the engine. There is a oil pressure sending unit that could be bad. But if the oil pressure goes up when it is above an idle, then the sending unit is probably ok.

Jan 10, 2011 | 2002 Chevrolet TrailBlazer

1 Answer

Oil pressure drops to zero when engine starts then goes to 60,while driving after warm,pressure drops down 4.3 V6 vortec engine


The 4.3 engine should have 20 to 30 psi at idle cold and around 50 to 60 psi running down the road. Has this engine had regular oil changes? If not the problem could be sludge build up. The oil pressure sending unit could be the problem. If in question about the sending unit install a mechanical gauge and watch the pressure.

Jan 02, 2011 | 1999 GMC Jimmy

2 Answers

The oil pressure gauge drops to zero when i slow down


Have a mechanical gauge hooked up to see that the oil pressure is good or not. If you have no or low at an idle, it can be due to bad oil pump, or worn out bearings.

Dec 16, 2010 | 1995 Jeep Grand Cherokee

1 Answer

2002 chevy trailblazer. 1.oil pressure gauge drops to zero at idle spuraticly 2 where is the sensor that controls the dash guage note: when i unplug the sensor @ the oil filter and the one on the passenger...


the sensor is on the side of the engine block. there's two thing that monitors oil. a pressure switch turns you oil light on and you oil pressure sensor the operates your gauge, start with your sensor. that is near you oil filter that is where it gets it pressure reading from

Jul 24, 2009 | 2002 Chevrolet TrailBlazer

1 Answer

02 jeep grand cherokee 4.7 eng


Hook up a manifold gauge (mechanical temporary use gauge, used by mechanics) and test the oil pressure. You probably need to replace the gauge. The computer sends info through a printed circuit board behind gauge cluster and sometimes you have to replace the whole gauge cluster.

Feb 05, 2009 | Daewoo Leganza Cars & Trucks

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