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I have 2001 jeep cherokee oil pressure is dropping to the point that check gauge lights come on. This happens after a few minutes of running or driving. But when i rev it to about 1 and a half or up to two it goes back up enough that check gauge light goes off . Can you help me ?
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Sounds like the relay that runs the fuel pump. The computer may be reading no oil pressure and shuts the engine down Check the oil pressure when it starts with a manual gauge. You may need to prime the oil pump.
Well the warning light is supposed to come on if any of the gauges display a dangerous condition, such as no oil pressure. You may have a faulty sending unit for the gauge, or a wiring problem, or the engine may actually be loosing oil pressure when the gauge drops. You could replace the sending unit as a test, or have someone check the oil pressure with a mechanical gauge.
Very first thing you need to do is install a mechanical pressure gauge on there to verify what you see on your gauge. If the actual pressure is low, then it's time to start looking inside the engine. If not, then you need to trace out the electrical problem but will know the engine is safe.
Your problem could be the result of a bad pressure sending unit but I would take care of that immediately. If the pressure doesn't return to normal after installing the new unit, do not drive 'til you have a mechanical gauge installed and the actual pressure checked and the problem corrected.
Last week my 2001 Grand Cherokee with a 4.7 was dropping below 10 and my "check gauges" light and chime came on. My sending unit was bad. I could see it was bad because oil was getting through the unit and leaking very slow. It's located above the oil filter. Easy fix, but the unit was over $50 and the 1 1/16 special deep socket for sending units was over $10.
If your oil pressure is running in the red this would indicate too much oil in the system. You should have your oil changed and refilled soon or you run the risk of burning out the oil pump. At idle your pressure should be just over a quarter of what your gauge has. At highway speed it should not exceed 3/4 of the gauge unless your going in excess of 100 MPH. Change the oil and filter and your vehicle should be fine.
I had the same problem with My jeep, when i took it in to a shop, they couldn't find any problems, , after about 5 shops and a ton of headaches from the low oil pressure warning, they found out that the gauge had gone bad, you may want to look into it as well.
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