When your 2022 Toyota 4Runner displays the P0304 code, the engine control module has identified consistent misfires in cylinder 4. The 2022 4Runner continues with the proven 4.0L V6 engine.
2022 4Runner Powertrain
The 2022 4Runner uses the 1GR-FE 4.0L V6 producing 270 horsepower. This reliable port-injected engine has been used in the 4Runner for years. Cylinder 4 is on the driver's side bank.
Typical Causes
- Ignition Coil Problems: Coil-on-plug failures
- Spark Plug Condition: Iridium plugs wear
- Fuel Injector Issues: Port injection deposits
- Vacuum Leaks: Intake system integrity
- Air Injection System: Secondary air pump
Diagnostic Process
Use Toyota diagnostics for detailed access. Monitor misfire counts. Port injection is simple. Test ignition components systematically.
Repair Recommendations
Replace faulty ignition coils with Denso parts. Install properly specified spark plugs. Clean injectors. Repair vacuum leaks.