Low oil pressure can and will destroy your engine. Check the oil level. If it's full or just a little low (1quart or little lower) then you have a serious problem already. If it is lower than a quart and a half, re-fill it and check pressure. If it's OK, then find the leak and fix it. If after filling it pressure does not return to normal then you already have a serious problem. have the actual pressure checked with a mechanical gauge and proceed from there. (likely bad bearings) If main bearings are involved, unless you remove the engine and re-grind the crankshaft and clean out the oil passages, you are wasting your $. Usually cheaper to replace the engine and more reliable as well.
SOURCE: 02 jeep grand cherokee 4.7 eng
Hook up a manifold gauge (mechanical temporary use gauge, used by mechanics) and test the oil pressure. You probably need to replace the gauge. The computer sends info through a printed circuit board behind gauge cluster and sometimes you have to replace the whole gauge cluster.
SOURCE: oil pressure gauge drops to zero when
This has an electric pressure gauge with a sending unit. Try this: When at idle, SLOWLY increase the engine speed. If the needle on the pressure gauge all of a sudden leaps to a pressure (like 'real quick') and acts normally with even faster engine speeds, the sending unit is bad. (It is just not reading the lower pressures.) Zero engine pressure will manifest itself in a bunch of knocky sounds and lifters that aren't pumping up and therefore "ticking" loudly. You probably don't have that since you didn't mention these problems.
Replace the sending unit after the above test and you should be fine.
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SOURCE: 02 cherokee losing oil pressure when accelerating, fine at idle.
Was the sending unit an aftermarket part?We like to install the original part back into most vehicle, but because of people price shopping, this can cause some issues. If the switch is working properly, the gauge should rise as the engine RPM's increase as you stated. With the key on and the engine off, disconnect the sending unit wire and ground it. The gauge should go to the highest reading, and that checks the wire, and the gauge. I suspect that the sending unit is failed or not the proper one for your vehicle.
SOURCE: oil pressure gauge drops to
If your oil pressure is dropping to zero at an idle, then I would quit driving the vehicle. It is very possible that the engine is low on oil. Or that the oil pump is going bad. If you continue to drive the vehicle, you could ruin the engine. There is a oil pressure sending unit that could be bad. But if the oil pressure goes up when it is above an idle, then the sending unit is probably ok.
SOURCE: I have been having intermittent
It sounds like the oil pressure switch has failed. It is only an on/off switch that trips at about 15 - 17 PSI, the reading displayed on the dash is created by the computer based on the pressure switch being closed and the engine RPM.
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