Question about 1990 Isuzu Trooper
Is there an oil pressure relief valve on this engine and if so where is it?
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Posted on Jan 02, 2017
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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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