Question about 2003 Buick Century
Put seaform in engine,ran for 10 minutes changed oil and filter.still tapping
Not going to fix that,it is an internal
Would have to take the motor apart
to do so
Posted on Dec 06, 2014
What did the oil look like before you changed it? Does the oil have any foam in it after running now? Coolant level been dropping? Any recent repairs on intake gaskets or radiator? Only at idle or at all RPM? Hydraulic lifters in your motor usually don't make noise until coolant has been mixed with the oil, otherwise they're pretty reliable. Factory intake gaskets were notorious for the rubber seal separating from the plastic housing, thus mixing oil and coolant. May be happening now or happened to a previous owner and the gaskets were replaced. Foamy, milky looking oil will be a telltale sign. A good scan tool, that will show you live data with mis-fire counter, should help pinpoint the cylinder(s) causing the noise
Posted on Dec 06, 2014
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Posted on Jan 02, 2017
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This problem is commonly caused by a dirty automatic idle speed control valve and throttle valve. Buy a can of throttle valve cleaner (do not use carburetor spray cleaner!) from NAPA or Carquest (made by CRC chemicals) and spray it into the air intake while the engine is running, use up about 1/2 the can, engine will try to stall hold the speed up, shut it down and let it soak for 30 minutes, restart and blow out the remaining fluid, shut it down and disconnect the negative battery cable for 5 Min's to reset the base idle control
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