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Re: low oil press, valve tap '99 4X4
If your oil pressure is reading low on gauge you need to get a manual test oil pressure gauge on it and check actual oil pressure.
Are you using good clean oil and the AC Delco filters?
How many miles on it and has it had regular service?
Is the engine sludged up inside?
I would not use any engine cleaners or additives in it.
If you oil pressure is up to specs. with a manual test gauge pull the valve cover and have a look at the rocker arms and push rods and valve springs.
Most of your valves are not adjustable on the newer engines.
Post back what you find and the oil pressure readings.
MT
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Remember proper testing gives us the answer to many problems.
MT
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