P0300 Misfire Helo
So I recently got a p0300 random misfire code and I've already done the following:
-Changed (new) 6 ngk spark plugs -Changed (new) 6 ignition coils -New Throttle body -New Valve cover with new PCV valve I have check for vacuum leaks and everything is fine. The car idles really rough and it wont stay on if I dont steadily hold the gas pedal down a little to keep it from dying. There's definitely a misfire since I get a bunch of popping and violent shaking. I also get a bit of dark black smoke when I rev it up to 5-6k which indicates unburned fuel. All 6 plugs are completely black at the tip and still look new at the threads but they are wet, which I assume is from unburned fuel I would think the Z1 motorsports Fuel Injector sub harness might be the fix, any ideas of what else it could possibly be? |
Injector stuck open?
Why not diagnose it properly instead of throwing parts at it? I haven't tried it, but I'm pretty sure it would run on 5 cylinders without it stalling. |
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