Question about 2002 Jeep Grand Cherokee

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Oil pressure gauge


My oil pressure gauge immediately goes to H when ever I start the engine. The oil level is normal and the engine seems to be running normally otherwise.

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  • rbowers Nov 10, 2008

    2000 jeep grand cherokee my oil pressure gauge fluctuates form 40-60 to 0 check gauged has plenty of oil

    runs fine drops to 0 when stopped please help

  • Anonymous Nov 26, 2008

    I have the same problem and am planning on changing the oil pressure sensor this weekend.
    Thanks,
    -Joe


  • altonallen Dec 21, 2008

    my oil presser go's to 80 as soon as i start my motor. it never did this be for why??

  • aclark79 Mar 30, 2009

    My 2002 Jeep is doing the exact same thing, except it does not drop whenever I stop or slow down. Any ideas?

  • Anonymous Apr 09, 2009

    Found this to be very help full Im going to buy the sensor tomarrow.

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The solutionit is the oil pump sensor (if gage goes up and down and gage light blinks).

Posted on Nov 06, 2009

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Sounds like the sending unit or wiring for the gauge is shorted to ground

Posted on Sep 21, 2008

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  • Jeep Master
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This is most likely a sending unit problem or a poor ground to the guage, try the sender first.

Posted on Sep 21, 2008

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wencal1963
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SOURCE: My oil pressure gauge immediately

YOUR IOL PUMP IS NOT OPERATEING PROPERLY ITS PRODUCING TO MUCH PRESSURE.APPARENTLY THE SEALS ARE WORN. SOLUTION REPLACE OIL PUMP IT'S CHEAPER THAN REPLACING THE ENGINE.

Posted on Jan 14, 2011

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1 Answer

Oil light on while running


Normally, the oil light indicates low oil pressure, usually due to lowe oil level. That being said, is you have a constant oil light with the engine running and you are not getting clacking noises from the valves, you may have a defective oil sender. Regardless, it is not worth destroying the engine to find out. You should immediately shut the engine and check the oil level. If it is very low, add oil and retest. If the fault persists, attach a mechanical oil pressure gauge to the engine. If the pressure is normal (usually 30-45 psi), then change the oil pressure sensor. If the oil pressure is less that 20 psi, you should investigate the oil sump and pump for problems.

Oct 04, 2015 | Cars & Trucks

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Why won't my car start?


Sounds like your oil pump may have seized.You'll need a gauge to verify this. The engine has a mechanism by which it automatically cut the engine off if there's a sudden drop in pressure. I would replace the pump. If you do make sure you prime it prior to tightening the oil pan down. A big question is why you were that low on oil. Good luck!

May 27, 2014 | 2003 Toyota Sequoia

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How can i fix the oil pump


see this tips and fix it. God bless you
The oil pump supplies oil to lubricate your engine. If the oil pump is worn or is not turning, the engine will suffer a loss of oil pressure, which may result in engine damage or engine failure.
The first sign of trouble may be a low oil pressure warning light, a drop in the normal reading on you oil pressure gauge (if your car has one), or the appearance of ticking or clattering sounds from your engine.
As a rule, most engines only need about 10 PSI of oil pressure for every 1,000 RPM of engine speed. Oil pressure will read higher than normal when a cold engine is first started because the oil is thick. Oil pressure will gradually drop as the engine warms up and the oil thins out. So normal oil pressure on a warm engine cruising down the highway is typically 30 PSI up to 45 PSI.
SYMPTOMS OF OIL PUMP TROUBLE
The first thing you should do if any of these symptoms occur is to stop your car, turn off the engine, let it sit for a few minutes, then check the oil level on the dipstick. If the oil level is at or below the ADD line, add a quart of oil to bring the level back up to the full mark. Add as much oil as is needed to raise the level to the full mark. Then restart the engine. If the warning light remains on, or the oil pressure reading does not climb back up to its normal range, or the engine noise does not go away, you may have a bad oil pump.
The other possibilities include a bad oil pressure sending unit, or a problem with the oil pressure warning light circuit or oil pressure gauge.
OIL PRESSURE SENDING UNIT
If the engine is NOT making any unusual noises and seems to be running normally, and the oil level on the dipstick is FULL, but you are still getting a low oil pressure warning light or low gauge reading, the fault could be a bad oil pressure sending unit.
The oil pressure sending unit is mounted on the engine block. On some applications, there is a spring-loaded pressure-sensitive diaphragm with a switch inside the sending unit. This switch completes the circuit to the low oil pressure warning light if oil pressure drops below a certain threshold. The unit may stop working if the diaphragm inside fails, if the switch is stuck, if the small hole that allows oil to enter the sending unit becomes plugged, if there is a loose, corroded or broken wiring connector at the sending unit, or there is a fault in the wiring circuit between the sending unit and warming light.
On vehicles that have an oil pressure gauge (electronic, not mechanical), the oil pressure sending unit has a small rheostat inside that sends a variable voltage signal to the oil pressure gauge when the diaphragm moves. A worn spot on the rheostat or any of the other problems just described for the simple pressure-type oil pressure switches can cause a problem.
FORD'S FAKE OIL PRESSURE GAUGE
On many Ford vehicles that were built from 1980 through the 1990s, the oil pressure sending unit has two switches, a low pressure and a high pressure. These vehicles also have an oil pressure gauge, but the reading on the gauge is not a true indication of real oil pressure. As long as the pressure to the sending unit is between high and low, the gauge will read normal. If oil pressure drops and trips the low pressure switch, the dash gauge will now read low. Or, if oil pressure goes up and trips the high switch inside the sending unit, the dash gauge will read high. Consequently, don't rely on the oil pressure gauge for an accurate reading in these vehicles. It is only a gross indication if the oil pressure is low, normal or high.
OIL GAUGE PROBLEMS
If the engine is NOT making any unusual noises and seems to be running normally, the oil level on the dipstick is FULL, and you have replaced the oil pressure sending unit but are still getting a low oil pressure reading on the dash gauge, the fault could be in the wiring circuit between the sending unit and gauge, or the gauge itself might be bad.
Check the wiring connections on both ends as well as wiring continuity between the sending unit and gauge. If no wiring faults are found, hook up a pressure gauge directly to the oil pressure port on the engine and check oil pressure with the engine running. If the engine-mounted gauge shows normal oil pressure but the dash gauge is reading low, the problem is a bad dash gauge.
On the other hand, if the engine-mounted pressure gauge reads low and you have done all of the above, chances are the oil pump is worn, or it is not picking up enough oil because of a restriction or blockage in the pickup screen in the bottom of the crankcase.
OIL PUMP PICKUP PROBLEMS
The pickup tube has a screen on the end to prevent large chunks of anything bad that ends up in the crankcase from being sucked into the pump. But we are talking BIG chunks of debris, not normal wear particles or carbon or dust or other microscopic-sized abrasive particles that can cause pump wear over time.

Sep 28, 2012 | 1996 Toyota Tercel

1 Answer

My oil pressure gauge immediately goes to H when ever I start the engine. The oil level is normal and the engine seems to be running normally otherwise.


YOUR IOL PUMP IS NOT OPERATEING PROPERLY ITS PRODUCING TO MUCH PRESSURE.APPARENTLY THE SEALS ARE WORN. SOLUTION REPLACE OIL PUMP IT'S CHEAPER THAN REPLACING THE ENGINE.

Jan 14, 2011 | 2002 Jeep Grand Cherokee

1 Answer

I have an 02 wrangler and the oil preasure goes down when Idling is that an oil pump going bad?


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.

Oct 16, 2010 | 2002 Jeep Wrangler

1 Answer

Oil pump is going bad in my 1999 chevy lumina


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.

Jul 02, 2010 | 1999 Chevrolet Lumina

1 Answer

Oil pressure drops, metal shavings, and somehow my oil level incr


My truck does the same thing, pressure never drops to 0 but drops low, replaced the oil pressure sensor and same thing happened. My oil is always black and has a lot of metal in it, next time you change your oil, pour a quart of transmission fluid into the oil and let it run for 10 minutes or so, this should thin out the oil and possibly unclog some of the ports that may be gummed up. What could have happened with the dipstick is that the old oil was too nasty to drain all the way, with the fresh oil it could have thinned out and raised the level, try the transmission fluid trick and see what happens, next possibility is to have the engine scoped to see whats going on inside

Apr 21, 2010 | 1997 Chevrolet S-10 Pickup

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

Oil light comes on when break then goes off


The oil light indicates that the engine's oil pressure has dropped below the minimum safe pressure. When the light goes out it suggests that pressure has been restored to a sufficient level for engine lubrication but this is nevertheless a bad sign.

I suspect that the oil level in the engine is too low and that the oil itself has greatly deteriorated and has not been changed for some time.

1. Check the oil level again, after the car has been standing for a few minutes, and make sure the engine oil level is at the maximum mark on the dip stick. If not then top it up.

2. Have the oil (and oil filter) changed in the car as soon as possible and ensure it is the correct spec viscosity oil for that engine .

3. Brake test the car to see if the oil light still comes on under braking.
If it recurs you need to have an oil pressure gauge hooked up to the engine (by an auto repair shop) to see what oil pressure is being achieved at various engine revs. If an independent gauge shows no problem with oil pressure then I would assume a faulty oil pressure sensor.
If the pressure gauge identifies a lower than normal oil pressure in the engine's lubrication system then the cause needs to be identified and fixed.

Sean

Dec 22, 2009 | 1998 Chevrolet Cavalier

1 Answer

What is the check gauges light


CHECK GAGES light (1) indicates a potential engine failure(low oil pressure, low coolant, coolant overheating) has occurred.
· Check gages and shut down engine. Gages should read as follows: Oil pressure 5 to 10 psi (34 to 69 kPa) at idle; Water Temp gage below 230 degrees (110 C).
· Check engine oil level (Para 2-11) if OIL PRESS gage indicates low reading. Check coolant level (Para 2-11) if Water Temp gage indicates high reading. Notify Unit Maintenance if levels are low.

If CHECK ENGINE light (2) is on, check engine oil pressure gage (3) and water temperature gage (4). If both indicate normal, proceed with mission and then notify Unit Maintenance. If either one does not indicate normal, stop engine immediately and notify Unit Maintenance


Oct 16, 2009 | 1999 GMC Jimmy

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