1. Knocking sounds from EJ20 Engine. The engine has a dilemma during the 4th cylinder. This cylinder is best; the cooling is worse In this particular location of the engine. In cases like this, the piston or rod starts off knocking then the engine is cold initially and all time https://alexisdiihn.blogrelation.com/35263936/not-known-details-about-subaru-ej20-turbo-engine