I have a 2004 Honda Pilot, 5.5 years old, 65K miles. My mechanic tells me that the front center spark plug loostened and plug ignition coil melted from blowback allowing debris from those parts to enter the piston. The top of the piston is all banged up, and the cylinder walls are scored, he showed me. He says if I want to patch it put in a new coil and piston, then sell it. If I plan on keeping it, get a new motor. I read one or 2 other things where people have had the same issue, are there more? Has anyone gone after Honda to cover this? Needing a new motor 6 months after the warranty is expired seems excessive. The local dealer was useless.