P0304 Pontiac -montana

Question

is it posable to fix this problem or does the whole engine have to be changed ?

Answer 1

P0304 means cylinder 4 is misfiring. if you have not replaced the spark plugs as a service maintenance replace them first.

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

Unless the engine is bad there is no need to replace it.