Symptoms of P0313
- Rough idle, shaking, or a stumble under acceleration.
- A flashing check-engine light during an active misfire.
- Power loss and higher fuel consumption.
Common causes of P0313
- Worn spark plugs, ignition coils, or plug wires.
- Fuel-delivery problems — injectors, pressure, or a lean/rich mixture.
- Vacuum leaks, low compression, or a mechanical fault in that cylinder.
Useful checks before replacing parts
- Compare fuel level, fuel pressure, misfire counters, fuel trims, pump command, and freeze-frame load when the misfire occurred.
- Inspect for low fuel, fuel pickup starvation, pump weakness, filter restriction, fuel slosh during turns, and related lean or pressure codes.
- Check whether misfires disappear after refueling and whether pressure remains stable under acceleration and cornering.
Related OBD-II codes
These nearby ignition / misfire entries can help compare wording and pin down the fault area.