TORQDEX // POWERTRAIN DTC
Cylinder 4 Misfire Detected
Misfire activity has been detected repeatedly on cylinder 4.
01 // CODE DEFINITION
What P0304 means
P0304 identifies abnormal combustion events associated with cylinder 4.
Ignition components, fuel delivery, compression, wiring, or localized intake problems should be investigated.
02 // COMMON SYMPTOMS
What you may notice
03 // COMMON CAUSES
What can trigger P0304?
Ignition problem
Plug, coil, wire, or connection faults may affect cylinder 4.
Fuel delivery problem
The cylinder 4 injector may be restricted or electrically faulty.
Compression problem
Valve, piston, ring, gasket, or valvetrain faults may cause low compression.
04 // DIAGNOSTIC ORDER
Start here
Confirm the misfire
Review scan-tool data to verify cylinder 4 activity.
Inspect ignition
Check the spark plug and coil or other ignition components.
Evaluate fuel delivery
Test injector operation and electrical control.
Verify compression
Compare cylinder 4 compression with the other cylinders.
05 // DIAGNOSTIC PRINCIPLE
Confirm the fault before replacing parts
P0304 identifies a condition detected by the vehicle control system. It does not automatically identify one failed component. Test the affected system before replacing parts.
06 // RELATED CODES