Quote:
Originally Posted by Laird Scooby
That's exactly what it should do under closed loop Lambda control. Lean-rich-lean-rich-lean constantly on idle and also cruising. Should go lean above 1200rpm with a closed throttle and rich on WOT then return to the lean-rich-lean-rich cycle.
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Its a narrow band O2 sensor, with wide (0-5V)/narrow(0-1V) band gauge. They don't normally show sensible indication on narrow band mode as the face has been calibrated for wideband even though they have a setting for it.
FYI the lean (fuel cut) on closed-throttle will only happen if you start over about 1800 or 2000rpm. Any significant load should be rich.
Do you know the conditions it goes into closed loop on cruise? By my mpg meter I'd guess it is below 50mph on the flat, with the throttle teased out to not accelerating or slightly decelerating. She will average 40mpg at 30mph in 5th.