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Message: <blockquote data-quote="ademily87" data-source="post: 1013546" data-attributes="member: 11841">.....help me? Lol  "Piston slap occurs when the piston skirt wears and the piston rocks back and forth about the wrist pin as it travels up and down--"slapping" the cylinder walls.It is caused by far too infrequent oil changes; once the the anti-wear additives have completely broken down the piston skirt is one of the high load areas that takes the biggest hit.Heavier oil may quiet it, also one of the "mechanic in a can" products like STP oil treatment. The good news is that it can occur for a long time before the engine dies--I had a 1973 Jeepster that slapped so badly you could hear coming from 1/2 mile away, drove it"^this sums it up perfectly. My Mach started doing the same thing after I abused the crap out of it haha.Take it out for a ride while cold and leave it in second and start at a low rpm and slowly accelerate with the windows down so you can hear, and really start listening after 3k rpm all the way up to atleast 5500 rpm. You'll more than likely hear the same noise you hear at start up. Just remember to accelerate veeerrryyyy slowly. Sent from my ADR6400L using Tapatalk 2</blockquote>