P0300 Multiple Cylinder Misfire

SYMPTOM
P-0300 MULTIPLE CYLINDER MIS-FIRE (GAS)

TEST NOTE
All symptoms listed above are diagnosed using the same tests. The title for the tests will be P-0300 MULTIPLE CYLINDER MIS-FIRE. (GAS)

WHEN MONITORED
With the engine running, after successfully performing a crank sensor learn.

SET CONDITION
When more than a 2% misfire rate is measured during two trips, or with a 10% to 30% misfire rate during one trip.

POSSIBLE CAUSES
- Mis-fire does not reoccur
- Cam, crank, valve timing, or vacuum problem
- Electronic ignition coil output low
- Engine mechanical problem
- Secondary ignition pattern irregular
- Fuel contamination
- Fuel pressure leak down out of specification
- Fuel pump amperage out of specification
- Fuel pump capacity out of specification
- Fuel pump pressure out of specification