Join Date: Jun 2007
Location: Huntsville/Arab alabama
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Wife’s 99 Jeep 4.0L grand Cherokee lost oil pressure!
We were on vacation in the Smokey Mountains yesterday and just as we reached the parking lot at the top of the mountain the dinger went off and the oil pressure gauge read 0!
I figured out that anything over 1,500 rpm would give me 40 psi and less than 1,200 RPM would give me 0 psi.
It was pretty tricky driving and it seemed to get worse as time went on but I managed to keep the rpm’s and psi’s up until we got home this evening. In heavy slow traffic it would get to where it took over 3,000 rpm to hold 35 psi, at interstate speeds 2,000 psi would hold 38 psi but anything less than 1,500 gave me 0 psi. So it seems like it is somewhat temp related.
BTW, I run Mobil 1 full synthetic and the Mobil 1 filter and the current oil is clean and full and has around 4,000 miles on it. The Jeep has 215,000 and is in like new condition.
Anyone got any ideas where to start diagnosing it???
I’m thinking oil pump or pressure regulator?
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