Question

2001 Nissan Sentra not firing on the 4th cylinder, what could be the cause?

Answer 1

P0304 NISSAN - Number 4 Cylinder Misfire Detected

Possible causes:

- Faulty spark plug 4 
- Faulty ignition coil 4 
- Ignition coil 4 harness is open or shorted 
- Ignition coil 4 poor electrical connection 
- Clogged or faulty fuel injector 4 
- Injector 4 harness is open or shorted 
- Injector 4 poor electrical connection 
- Improper spark plug 4 
- Insufficient cylinder 4 compression 
- Incorrect fuel pressure 
- Intake air leak