Originally Posted by bacardi11
just so you know if you run LEAN you will slowly burn holes in the top of the pistons. that means no compression you don't want to do that. these computers run engines. when you run LEAN must add more fuel bigger injectors just trying to help you out.
I doubt he's running that lean to cause detonation. I ran headers and straight 2.5 through in my old 2GS and the CEL came on after 5K miles or so. Destroyed the 2nd set of O2 sensors, he just needs to pull the code and we can go from there.