Question about 1993 Jeep Grand Cherokee
Engine idles a little low aroun 800 rpms. I flushed engine with gunk and presure is the same.
There could be several reasons for this either the sending unit is faulty( the pressure should always rise with engine rpms) or you have a bad connection to the sending unit. Unless you have a severe upper engine noise I doubt that it is an oil pump problem.. please rate
Posted on Dec 04, 2008
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Oil pressure should be around 30 at idle and then sit at 60 when engine is above 2,000 RPM. If pressure varies at all engine speeds it indicates a sticking pressure relief valve which is located within the oil pump. You could try using some oil flushing product in the engine oil before the next oil change to see if it removes the gunk that is causing the valve to stick. If that does not improve it you should see a mechanic about replacing the relief valve.
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