The Mitsubishi 6D22 engine doesn't have a universally standardized firing order across all its applications. The firing order depends on the specific application and potentially even minor variations within the engine family. You need to consult the
engine's specific service manual or a reliable parts catalog for the exact firing order and timing specifications. These documents will be specific to the model year and exact application of the engine (e.g., truck, boat).
Without knowing the precise application of your 6D22 engine, I cannot provide you with the correct firing order and timing.
