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RE: UrQ FTCU ground on the intake - What the #@$%.
All observed mixture instability problems were resolved 100% by grounding
the meter directly to the engine.
> I also plan to, in the meantime, re-wire my HalMeter AF-30 to connect
> the ground directly to the engine and see if that eliminates what
> appears to be some flaky too-lean O2 readings.
Yes, you _must_ ground an O2 meter to the engine, preferably as close as
possible to the O2 sensor or you'll have up to 0.2V difference between
the sensor's ground and the meter's ground... and it does make it indicate
lean - at least on my car where my meter is grounded at the ECU it does.