Engine Performance problem
2002 Honda Odyssey 6 cyl Two Wheel Drive Automatic 122566 miles
This vehicle has a sharp miss-fire starting about a 30 seconds after start-up and ending after about 5 minutes. The miss-fire is random ans seems to be 1 cinder at times and many at times, back and forth. It sets no hard or pending codes, the gas reading from the tail pipe during the period of missing is CO2: 15.3, CO: 0.01, HC: 14. Vacuum is 22' and very steady, 0: HC or CO in cooling system. We have replaced all coils, plugs, 2 injectors, cam sensors, crank sensor, O2 sensor, cleaned EGR passages, fuel injection cleaning (pressurized can type), Induction services, adjusted valves, wiggle tested all wires, coil and injector connectors, performed propane enrichment with no change.
Engine misfires can be caused by worn or fouled spark plugs, a weak spark (weak coil, bad spark plug wire), loss of compression, vacuum leaks, anything that causes an unusually lean fuel mixture (lean misfire), an EGR valve that is stuck open, dirty fuel injectors, low fuel pressure, or even bad fuel.