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Originally Posted by RichX
Sean has confirmed the AFR's are alright .. .
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Did it fault for him?
The stumble could be it going lean intermittantly.
Intermittent faults are the hardest to diagnose.....
The tune could be rich as fuck and safe.........
but and here's the big BUT!: when the AFM faults and decides to send incorrect data to the
ECU telling the
ECU there is no air flow when there actually is massive airflow (i.e at 4500 rpm on boost) it will go lean regardless of other sensor inputs or the tune.
It may only do this occasionally if the AFM brain farts aren't happening all the time, which it seems yours aren't.
So your car may be running safe rich mixtures 99% of the time....it's that 1% you have to worry about.
And don't give up...That only leads to Holden ownership
