Diagnostic Aids

An intermittent misfire may be caused by faulty plug/coil wires, contaminated fuel, low fuel level, misaligned (loose or cocked) crankshaft sensor.

Fig 1: Code P0301-306 Schematic ("S" & "T" Series 4.3L - VIN W) Cylinders 1-6 Misfiring

Fig 2: Code P0301-306 Flow Chart ("S" & "T" Series 4.3L - VIN W) Cylinders 1-6 Misfiring