The 2022 Infiniti QX80 delivers flagship luxury full-size SUV capability with the powerful 5.6L V8 engine. When your QX80 displays a P0304 code indicating a cylinder 4 misfire, understanding this proven powertrain helps guide accurate diagnosis.
Understanding P0304 in the QX80
The QX80's 5.6L V8 is Nissan's VK56 engine known for robust power and durability. Cylinder 4 is located on the right (passenger) bank of the V8. The engine control module monitors combustion events through crankshaft position analysis.
V8 Engine Considerations
The VK56 V8 has proven reliability across truck and SUV applications. The large displacement V8 uses individual coil-on-plug ignition for precise misfire detection. Regular maintenance keeps this robust engine running smoothly.
Diagnostic Approach
Access the cylinder 4 ignition coil on the right bank. Inspect spark plug electrode condition. Check for vacuum leaks in the intake manifold. Verify fuel injector operation if ignition components check out.
Resolution Process
Replace spark plugs with Nissan/Infiniti specifications if worn. Test ignition coil output. The quality of factory ignition components means thorough diagnosis should precede parts replacement.