Random Misfire

DTC P0300: Random misfire and any combination of the following:
DTC P0301: Cylinder 1 Misfire Detected
DTC P0302: Cylinder 2 Misfire Detected
DTC P0303: Cylinder 3 Misfire Detected
DTC P0304: Cylinder 4 Misfire Detected
DTC P0305: Cylinder 5 Misfire Detected
DTC P0306: Cylinder 6 Misfire Detected

NOTE:
- If the misfiring is frequent enough to trigger detection of increased emissions during two consecutive driving cycles, the MIL will come on, and DTC P0300 (and some combination of P0301 through P0306) will be stored.
- If the misfiring is frequent enough to damage the catalyst, the MIL will blink whenever the misfiring occurs, and DTC P0300 (and some combination of P0301 through P0306) will be stored. When the misfiring stops, the MIL will remain on.

1. Troubleshoot the following DTCs first if any of them were stored along with the random misfire DTC(s):
P0107, P0108, P1128, P1129: MAP Sensor
P0131, P0132: Primary HO2S
P0171, P0172: Fuel metering
P0401, P1491, P1498: EGR system
P0505: Idle control system
P1259: VTEC System
P1361, P1362, P1366, P1367: TDC1/TDC2 sensor
P1519: AC valve
2. Test-drive the vehicle to verify the symptom.




3. Find the symptom in the chart, and do the related procedures in the order listed until you find the cause.