2002 jeep wrangler 4.0 liter oil pressure drops after warmed up . When driving /accelerating pressure stays at 40 which is good ,when i arrive at a light or stop sign pressure drops to 0. I have already replaced sending unit ,changed oil and filter still have the problem. Please help what could be the problem thank you
When the gauge is at 0, is there any noise from the engine (tick, knock etc?) I would have someone put a mechanical gauge on there and read true pressure.Your driving pressure seems OK but if the low number is "real" something is wrong!
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i will try the mechanical gauge and let you know how it worked out
Hmmm...
If the oil pressure is actually at 0.1 as the gauge reads, I don't see how the engine could avoid locking up -- pressure below 10 psi is in the danger zone.
Therefore, I would have to conclude that the reading is incorrect.
One way to verify this is to install an analog pressure gauge in the sending unit port.
This would give you an accurate reading. I know this sounds complex, but this is what a garage would do.
If the pressure reads "normal" on this gauge, then it seems the only conclusion would be the gauge on the dashboard is faulty -- there could be several reasons for this which could be explored after the actual pressure is assessed.
Summary: My suggestion would be to next install a gauge and get an accurate reading on oil pressure.
Charlie
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