Exhaust Backfire
Engine not tuned to specifications. Engine vacuum leaks. Faulty diverter or check valve. Electric Air Switching Valve or Air Control Valve not switching air pump discharge to air cleaner on start or quick deceleration.
Engine not tuned to specifications. Engine vacuum leaks. Faulty diverter or check valve. Electric Air Switching Valve or Air Control Valve not switching air pump discharge to air cleaner on start or quick deceleration.