Possible Cause
DTC P0300 set with P0301, P0302, P0303 or P0304 indicates random misfire. To determine cause of misfire, check the following:
- Fuel pump insufficient fuel pressure/volume.
- Fuel pressure regulator stuck open.
- Fuel return line clogging.
- Fuel filter clogging.
- Distributor malfunction.
- Ignition coil wire open, or leaking.
- Ignition control module malfunction.
- Low compression.
- Poor fuel quality.
- VTEC system malfunction.
- H02S malfunction.
- H02S circuit malfunction.
- Carbon deposits on valves.