Question about 1999 Chevrolet S-10 Pickup
It is most likely the valve lifters tapping. The lifters are hydraulic meaning they have to be pressurized with engine oil to correctly adjust the valves. Sometimes after an oil change one or more of the lifters can collapse (loose pressure). Usually this is not a problem, it will most likely re-pressurize and quite down after the engine runs for 10 to 15 minutes. Pay attention to the oil pressure, if your truck has a gauge if it reads between 30 to 50 PSI cold when running then you shouldn't need to worry.
Posted on Mar 21, 2011
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Posted on Jan 02, 2017
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