Oil Pressure Shows Zero On Gauges
Check gauges light. 0 oil pressure on gauge. No big oil leak, good oil level. cycled ignition few more times, then gauge starts to move. Goes up to 80 (max line) and stays there.
Vehicle Details:
Make (manufacturer): jeep
Model: grand Cherokee 6cyl 2001 Laredo
Year: 2001
Expert's Reply:
Is It Faulty Gauge Or Its Oil Pressure Problem?
You've got a gauge issue rather than an actual oil pressure problem. Even if the pressure was truly at 80 when cold and accelerating, when the engine warms and especially at idle the pressure should drop much lower, to the lower end of the scale on the gauge. If the oil is full and you aren't hearing any abnormal noises from the engine then it clears that actual oil pressure is ok.
Then What's The Actual Problem?
What you are experiencing are common symptoms of a failed oil pressure sending unit on a 4.0 engine. The oil sender threads into the right side of the engine block in the rear and receives pressurized oil from the engine, interprets that into an electrical signal and sends the information to the powertrain control module. It then sends that to the instrument cluster for gauge operation.
Is It Common Problem On These Model Vehicles?
When the sender on a 4.0 fails it usually does so in the way you have described, oil pressure will show about 80 PSI all the time no matter what. I believe you would find that if you turned the key on without even starting the engine it would still show the 80 PSI. If so then you could unplug the sender and see if the gauge drops. If so then you know the wiring is good and the sender itself is the problem.
Ok,How To Replace Oil Sender Unit?
Replacing it just involves unplugging the connector and threading the old one out of the engine block. It's best removed with a socket but you may be able to grab onto it with some good adjustable pliers.
For your information the original sender have a hex for a large socket (It is some what 1 3/16") and the replacement sender will likely have a standard oil sender hex which requires a special oil sender socket like the one shown here:
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