Rickm6 Posted July 20, 2005 Report Share Posted July 20, 2005 Okay, began checking out my 99 STS which only has 46K miles. I've changed oil religously. When running the engine it has a knocking sound like a piston skirt slapping. Not good. Used a mechanics stethoscope and it sounds like its coming from number 6 or 8 cylinder, in that area anyway. Any thoughts or ideas? Is this common on these? Hard to believe a well maintained Northstar could do this with only 46K on it. Link to comment Share on other sites More sharing options...
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