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Re: 2000 jimmy knocking noise
Coolant in the oil is a very common cause of lifter noise. Do you have to add coolant? Is there a coolant leak that you can't seem to locate? Look at the underside of the oil fill cap, is there a chocolate milk shake colored goo in it? If the answer is yes to any or all of these, the problem could be a leakng lower intake manifold gasket. A cooling system pressure test will tell if there is a leak. If the leak is internal, coolant can leak into the crankcase and thin the oil causing lifter noise, especially when the engine is cold.
You should be using 5W30 oil all the time.
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