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I have a 1996 Jeep Cherokee 2.5l diesel manual. On start up oil pressure is ok after 2-5 seconds but then drops to zero when driving, anything from 2-5 minutes later. If I stop the motor and re-start oil pressure is again ok after start up and stays ok on engine idle but drops to zero again when driving. The engine sounds more metalic than normal when no oils pressure! Any ideas what this could be?
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The oil pressure gauge on a 2004 WJ doesn t really show the pressure, but it will go to a preset value when pressure is ok, or it will stay at o PSI. So you need a pressure switch on this jeep and not a pressure sending unit. If the right unit is installed, then or the pressure indicator is faulty, or wiring. Do a test of the instrument panel to see if the indicator works: ignition switch in off, press the odometer reset button and now switch ignition in run. Instrument panel will start a self test, all lights will come on and all meters will go full scale and return to normal.
ask a local mechanic to have a look ,must have a sensor problem somewhere but what?? it would need to do it with the mechanic driving it to know for sure whats wrong ,sorry if iam vauge but we only have diesels here a petrol like this isnt worth anything here maybe a 1000 euros if the right dummy comes along but a diesel manual of this year ?' then put another nought on the end
High oil pressure is ok, lack of pressure if the engine is running, is very bad. Pressure is supposed to drop to zero as soon as you turn off the engine, nothing abnormal about that.
The oil pressure dropping to zero is common for cherokees. Replace the oil pressure sending unit and it will be good as new. Cracked exhaust manifolds are also common. Usually it will crack where the 2 pipes are welded into 1 pipe before it connects to the front pipe. There are lots of replacement headers out there to choose from. I just ordered one through quadratec.
your oil pump is either weak or there is sludge i9n the oil pan. my adives is to have the oil pan dropped . chances are sludge is the culprit. as the oil get's warm the pressure should only drop slightly but pressure is generally dictated by engine rpm. pumps are gear driven so if it was a bad pump your oil pressure would start out very low at start up.
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