The 2022 Mazda CX-30 combines crossover versatility with the engaging driving dynamics Mazda is known for, powered by the efficient Skyactiv-G 2.5L engine. When your CX-30 displays a P0304 code indicating a cylinder 4 misfire, prompt diagnosis maintains the responsive performance this compact crossover delivers.
Understanding P0304 in the CX-30
The Skyactiv-G 2.5L engine in your CX-30 features a high 13:1 compression ratio that delivers excellent fuel efficiency. Cylinder 4 is positioned at the rear of the inline-4 engine, nearest the firewall. The engine control module monitors combustion events through crankshaft position analysis to detect misfires accurately.
Skyactiv Engine Characteristics
High compression ratio engines are more sensitive to ignition system condition than conventional designs. Spark plug wear that might not affect other engines can cause misfires in the Skyactiv powerplant. The precise fuel injection calibration also means injector performance directly affects combustion quality in each cylinder.
Diagnostic Steps
Access the cylinder 4 ignition coil at the engine's rear. The individual coil-on-plug design allows isolation testing by swapping components. Inspect the spark plug carefully—electrode condition and gap are critical in high-compression applications. Check for vacuum leaks in intake components.
Resolution Strategy
Replace the spark plug with Mazda-specified components designed for high-compression operation. Verify ignition coil output is within factory specifications. If carbon deposits are suspected on intake valves, inspection and cleaning may be warranted. Fuel system analysis identifies any injector performance issues.