knock

Hi, I have a 1992 cb5 Lancer gti (engine 4g93 dohc). The car has stored a knock sensor code (code 31), but there seems to be no knock occurring. The strange part is that the check engine light only appears between 3k and 4k rpm and goes away past those rpm, also doesn't appear at WOT. Does this...

I have a technical question on how antilag works. From my understanding, the whole purpose of ALS is to retard timing and add fuel off-throttle. When you do this, the temperature of the turbo and exhaust system is increased, but how does this also increase the potential for knock and...