One. Knocking sounds from EJ20 Engine. The engine has a dilemma during the 4th cylinder. This cylinder is best; the cooling is even worse With this position on the engine. In such cases, the piston or rod commences knocking then the engine is cold in the beginning and all time https://israelvcgii.mybloglicious.com/50347934/5-simple-statements-about-jdm-subaru-ej20-engine-explained