P0304

2017-10-10

Description:

  • The fault code P0304 indicates that there is a misfire detected in the cylinder 4 of the engine. This may result in poor engine performance, reduced fuel efficiency, and increased emissions.

Possible Symptoms:

  • Illuminated check engine light

  • Rough idle or stalling

  • Reduced engine power or acceleration

  • Vibrations or shaking while driving

  • Increased fuel consumption

  • Increased exhaust emissions

Possible Causes:

  • Faulty spark plug in cylinder 4

  • Failed ignition coil in cylinder 4

  • Low compression in cylinder 4

  • Malfunctioning fuel injector in cylinder 4

  • Vacuum leak in the intake manifold

  • Failed engine control module (ECM)

Related Parts:

  • Crankshaft Position Sensor: The crankshaft position sensor monitors the position of the crankshaft to regulate fuel injection. Problems lead to engine misfire and engine stalling

Possible Solutions:

  • Replace the spark plug in cylinder 4

  • Replace the ignition coil in cylinder 4

  • Check and repair any low compression issues in cylinder 4

  • Replace the fuel injector in cylinder 4

  • Inspect and repair any vacuum leaks in the intake manifold

  • Replace the engine control module (ECM) if necessary

Search