Question about 2001 Jeep Grand Cherokee

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Losing oil pressure when at idle. pressure is fine when driving

When I first begin to drive all is fine. But after about 10 minutes of driving and the engine warms up, if I come to a stop light and the truck is in idle the oil pressure gauge drops to zero, activating my check gauges light. I check the oil level and it is good. I do not see any apparent leaks under the engine. The engine doesn't make any funny noises when driving, a mechanic actually says it is one of the quietest jeep engines he has heard. At a loss here, any suggestions?

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A comparatively quiet engine is often a worn out engine.( Much of the knocking sound in an engine is caused by compression and expansion of gasses, which in a worn out engine is reduced due to leakage of gasses beyond the piston rings or valves.)

You will first have to have the engine pressure tested on each cylinder to ascertain the overall condition.
Usually there are one of two reasons for a low oil pressure warning light or gauge reading.


No.1: The engine is badly worn and oil pressure can leak beyond the piston rings and into the cylinder.


No.2: The oil pump is close to failing or has already failed.


There is also the slight possibility that both of these faults have occurred at the same time.

Posted on Nov 04, 2012

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Posted on Jan 02, 2017

  • 295 Answers

SOURCE: oil pressure gauge goes up when car started, but then down to 0

u Have a problem with the oil sending unit. The sensor is located beack right side of the engine block. Take out the switch and make sure u have good oil PSI. Should be 6 psi at idle and around 50 at 4000 RPM. If the presure is ok replace the switch they are very cheap about 20 bucks. Please rate.

Posted on Aug 12, 2009

outdoorsman5
  • 631 Answers

SOURCE: 2002 2.5l no oil pressure on gauge. Runs fine...no

You better put a manual gauge on your engine and make sure you have oil pressure. Could just be a faulty gauge or sending unit but I sure as heck would be checking it with a manual gauge.

Posted on Aug 01, 2009

SOURCE: 1999 jeep cherokee classic: check engine light

yes, don't let us guess. take it in and get it checked out. time is engine wear.

Posted on Aug 04, 2009

  • 13 Answers

SOURCE: 99 jeep grand cherokee oil pressure gauge drop

check oil pressure connector for damage,corrotion,oil, clean connection. make sure good ground, 5 volts suplyy and oil pressure sensor signal volts returt to computer. connector have 3 wires

Posted on Feb 17, 2010

  • 2926 Answers

SOURCE: 1999 Jeep Cherokee Sport 4.0L engine. Oil

I'm assuming the engine is still running and no engine noise has occured due to loss of oil pressure, and it is just the gauge that is not reading? If so, the oil pressure switch that is located on the camshaft sensor, could have a bad connection or the oil sensor will need to be replaced. The oil sensor is located on the left side of the engine and is mounting horizontally on the camshaft sensor housing.

Posted on Apr 08, 2010

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