If the oil pressure is not above 5 or 10psi, the fuel pump will not get power. The engine should start and die.
The pressure sending unit may be faulty, or the engine oil pressure may be very low.
SOURCE: 2002 Jeep Grand Cherokee 4.0L oil pressure gauge reading too high
if the gauge starts a 0 - goes to 1/2 , than full - sounds like gauge is OK - seems to me like the sending unit is bad - you could try removing the sender and trying to clean out the port with "brake clean", letting it dry than re-installing it. the pressure switch is still the least expensive place to start
SOURCE: 1996 Jeep Grand Cherokee...Blowing ASD fuse
My daughters jeep had the same problem. We fixed by finding the wires that run beside the manifold down under the car. The conduit that have the wires in it was worn away because of resting up against the manifold, causing the wires to short the system out. Once I replaced the conduit and taped the wires it has not shorted out again. By the way, the Jeep dealer couldn't find the problem.
SOURCE: Oil Pressure Always Runs High - 2002 Grand Jeep Cherokee
Might be that the oil pressure switch is going out. Unless this has been happening for a while now.
SOURCE: Oil pressure goes to high right away as soon a car is started on
Try replacing the oil pressure sending unit
SOURCE: oil pressure gage at zero
I have the same problem,an erratic reading on the oil pressure gauge.I have been in touch with Chrysler Jeep (USA) and this is a common problem.The oil pressure sensor needs to be replaced this is on the oil pump by the oil filter.I changed mine and no more problems.
Bear
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