The 2022 GMC Acadia offers three-row crossover versatility with either the 3.6L V6 or available 2.0L turbocharged four-cylinder engine. When your Acadia displays a P0304 code indicating a cylinder 4 misfire, understanding your engine configuration helps focus the diagnosis.
Understanding P0304 in the Acadia
Cylinder 4 location differs by engine. In the 3.6L V6, cylinder 4 is on the rear of the left bank. In the 2.0L turbo four-cylinder, cylinder 4 is at the rear of the engine, nearest the firewall. Both engines use individual coil-on-plug ignition allowing targeted diagnosis.
Engine-Specific Considerations
The 3.6L V6 in the Acadia shares architecture with other GM vehicles and has proven reliability. The 2.0L turbo operates under higher combustion pressures, accelerating spark plug wear. Turbo models should also be checked for boost leaks that can cause lean misfires.
Diagnostic Process
Identify your engine configuration and locate cylinder 4 accordingly. Access the ignition coil and inspect condition. Remove the spark plug and check electrode wear. On turbo models, inspect boost piping for leaks. Check for vacuum leaks in the intake system.
Repair Approach
Replace spark plugs with AC Delco specifications. Turbo models may require more frequent plug replacement due to operating conditions. Test ignition coil output. Address any boost or vacuum leaks identified during diagnosis.