The 2022 Buick Envision delivers premium compact SUV refinement with its responsive 2.0L turbocharged engine. When your Envision displays a P0304 code indicating a cylinder 4 misfire, understanding this modern powertrain helps guide accurate diagnosis.
Understanding P0304 in the Envision
The Envision's 2.0L turbocharged four-cylinder provides an excellent balance of power and efficiency. Cylinder 4 is located at the rear of the inline-4 engine, nearest the firewall. The engine control module monitors combustion events with precision.
Turbo Engine Considerations
The turbocharged environment creates higher combustion pressures than naturally aspirated engines. This accelerates spark plug wear and demands ignition components in excellent condition. Direct injection technology can contribute to carbon buildup on intake valves over time.
Diagnostic Approach
Access the cylinder 4 ignition coil at the engine's rear. Inspect spark plug electrode condition. Check for boost leaks in the charge piping. Verify no vacuum leaks exist in the intake system.
Resolution Process
Replace spark plugs with GM specifications for turbo operation. Test ignition coil output. If carbon buildup is suspected on higher-mileage vehicles, intake valve cleaning may be warranted.