Need help, running very rough!

[NitroBiz]

Got these codes tonight. Can anyone help me figure out what's going on?

// 1) 2B39 Combustion misfire with cut-out cyl 5
// 2) 2B3A Combustion misfire with cut-out cyl 6
// 3) 2B3B Combustion misfire with cut-out cyl 7
// 4) 2B3C Combustion misfire with cut-out cyl 8
// 5) 2B41 Combustion misfire with cut-out several cyl
// 6) 2B57 Motor emergency programm activated
// 7) 2796 Motor emergency programm activated

[MikeHawk7]

My guess is throttle body actuator failure.

[NitroBiz]

Originally Posted by MikeHawk7

My guess is throttle body actuator failure.

Both TA's replaced, thermostat and now coils and plugs and it's still having the same issues? What's next? O2 sensors or MAP sensor?

[tdott]

Did you do anything right before you started having this issue?

Valve cover gaskets? Or anything like that?

[VitSports6]

Battery?

[NitroBiz]

Originally Posted by VitSports6

Battery?

Battery is fairly new.

[MikeHawk7]

Originally Posted by NitroBiz

Battery is fairly new.

You've got me stumped. I'd look into fueling issues: maybe your fuel pressure sensor or moving your injectors around to the other 4 cylinders to see if the misfire follows them. If it's your injectors, I'd have them serviced. I went through Mr. Injector (online) for my motorcycle and was very happy with it. My M3 will be getting that service too soon enough.

Also I'd double check to see if your plenum is seated properly, which you'll probably do anyway to get to the injectors.

[amrazM]

run ista test plan on the Idle Control Valve,

followed by checking the exhaust to header interface for a leak, then verify accurate lambda readings.

[NitroBiz]

Originally Posted by amrazM

run ista test plan on the Idle Control Valve,

followed by checking the exhaust to header interface for a leak, then verify accurate lambda readings.

How do I do that?

[NitroBiz]

So I believe my mechanic found the problem. He did a lambada probe test above the primary cats and found out that my upstream O2 sensor on bank 2 errors out above 500 celsius, which would explain the misfire and limp mode.