Hi guys, I am trying to get an answer for pinging on my engine. My boat is a '97 Crownline 202BR with a 5.7 merc., 2 barrel carb. Thunderbolt IV ignition. The valve seat broke. Engine was completely rebuilt. It was bored .030 over and had block and heads decked. I also added an aftermarket heat exchanger. Engine runs great until it heats up. Then, at full throttle, it begins to ping after a minute or two. I have to slow to get pinging to stop.<br /><br />Can this be from the heat(engine temp at 195 during full throttle) or timing of engine? Can the electronic advance module be bad, and causing improper advance? Guy at local mercruiser dealer said he never heard of the module on the distributor(chip for electronic advance) going bad. Any thoughts?
