This is going to be long.
03 Mazda 6s 3.0 V6 (~130k)
Things I've replaced
- Oxygen Sensors
- Ignition Coils
- Ignition Coil Plugs
- Fuel Pump
- Spark Plugs
- Intake Gasket
- Cracked Hoses
- Rebuilt Transmission
- PCV Valve
- EGR Valve Mod
I took it to mazda after I replaced all this.
They said it's misfiring on Bank#1, Bank #2
, Bank #3
They said all the following were fine.
- Everything I replaced
- Fuel/Air ratio was fine
- No vacuum leaks
- No fuel leaks
- Fuel Injector resistance is good
- Compression test came back fine (190 PSI on all cylinders (save bank 4 which is 185, still fine)
- They reset the crankshaft adjustment and keep alive light
I spoke with the service tech and he said at this point they're just trying things and seeing if they work. I should take it and do the labor myself if I can. The case was so odd for all they did, they charged me basically nothing in labor.
He said I should try swapping the fuel injectors, I'll probably just buy new ones as I have to take the intake off to do so anyhow. After that he said it might be the PCM or harness, but he said he can't really see anything wrong with either.
Things that crossed my mind... Possibly replace purge solenoid valve before new fuel injectors and see if that helps?
Any advice/thoughts/suggestions/conspiracy theories would be much appreciated. Been fighting with this thing for months.