Active fuel management

[bg1988]

SO my AFM bank of cylinders is running lean/rich   

 

 the O2 sensor drops to ZERO volts   (Flat 0.00 volts)

 

so is it safe to assume the sensor is dead?

 

the V8 bank  runs fine    no lean/rich issue  at all

[CamGTP]

I think there may be some misinformation on your part.

 

When the DoD/AFM is active, there are 2 cylinder per bank that shut down. One half of the engine does not just shut off, it couldn't run like that because it would be so unbalanced with only the left or right bank firing. They have to keep using both banks but they just shut off cylinders 1,4,6,7 to keep the engine happy.

 

But to answer the question on the o2 sensor, if the sensor is dropping to nothing. It's a good bet to say the sensor is on the fritz and you should replace it. If problems continue you have a wiring issue on your hands.

[jay webb]

during AFM its cylinder #1,#7,#4,#6 that shut off and the rest of the cylinders still operate