P0304 Code: Meaning, Causes, and Symptoms | OBD2 Codes
P0304 – Cylinder 4 Misfire Detected
P0304: DIY Repairing Video Tutorial
Check out nonda Auto DIY Center for more engine error code repairing videos.
https://www.youtube.com/playlist?list=PL-Lyko0O0oxHe1AGvzwAz-wokJPXAtW97
P0304 Possible Causes
Faulty spark plug 4
Clogged or faulty fuel injector 4
Faulty ignition coil 4
Fuel injector 4 harness is open or shorted
Fuel injector 4 circuit poor electrical connection
Ignition coil 4 harness is open or shorted
Ignition coil 4 circuit poor electrical connection
Insufficient cylinder 4 compression
Incorrect fuel pressure
Intake air leak
P0304 Possible Symptoms
Engine Light ON (or Service Engine Soon Warning Light)
Lack/loss of power
Hard start
Engine hesitation
Description
When a misfire occurs, engine speed will fluctuate. If the engine speed fluctuates enough to cause the Crankshaft Position (CKP) sensor signal to vary, the Engine Control Module (ECM) can determine that a misfire is occurring.