DTC P0300: Random Misfire Detected

NOTE: Trouble shoot DTC P0102, P0103, P0171, P0172, P0401, P0505, P1102, P1103, P1361, P1362, P1381, P1382, P1491, P1498 or P1508, if set, before proceeding.

If DTC P0300 is set with DTC P0301, P0302, P0303, P0304 or P0305, go to DTC P0301, P0302, P0303, P0304 OR P0305: MISFIRE IN ONE CYLINDER. DTC P0300 is stored in PCM memory when an increase in emissions has been detected during 2 consecutive drive cycles. If DTC P0300 is set with no other codes, check the following:
- Insufficient fuel pressure or inadequate fuel flow.
- Clogging, blocked or leaking fuel line.
- Clogging fuel filter.
- Stuck open fuel pressure regulator.
- EGR system malfunction.
- Distributor malfunction.
- An open or leaking ignition coil wire.
- Ignition Control Module (ICM) malfunction.
- Carbon deposits on valves.
- Low engine compression.
- An Idle Air Control (IAC) valve malfunction.
- A fast idle thermovalve malfunction.
- Fuel octane level less than specification.
- A damaged or dirty air cleaner element.
Repair as necessary. If no problems are found, go to next step.
If misfire condition occurs only at low engine RPM and load, check the following items in order listed: air cleaner element, IAC valve, EGR system, fuel pressure, and crankshaft position sensor and valve clearance.
If misfire condition occurs only while accelerating, check the following items in order listed: air cleaner element, distributor and ignition wires, fuel pressure, and ICM.
If misfire condition occurs only at high engine RPM and load, check the following items in order listed: air cleaner element, fuel pressure, distributor and ignition wires, ICM, and crankshaft position sensor and valve clearance.
If misfire condition is not specific, check the following items in order listed: air cleaner element, fuel pressure, distributor and ignition wires, ICM, and crankshaft position sensor and valve clearance.