One. Knocking noise from EJ20 Engine. The engine has a challenge during the 4th cylinder. This cylinder is best; the cooling is worse in this area from the engine. In such a case, the piston or rod starts off knocking then the engine is chilly to start with and all https://jdmsubaruforsale09529.eedblog.com/29292435/facts-about-jdm-subaru-ej20-engine-revealed