Thanks for the reply

70% KOEO indicates that the system recognizes electronic control, correct?

The car is at 80 degrees celcius when I attempt to adjust mixture. There is some fluctuation happening around 10%, sometimes it sticks exactly at 10%.

Before, I would see 49% while warming up, and at around 60 degrees, when the 02 sensor became active, this reading would start to fluctuate around whatever it was set to (I was at about 50%).

According to the manual, only a FIXED reading indicates a fault. 10% can have the following "possible causes:"

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Sensor air volume meter wrong pole connection or defective. Speed Approx 2000rpm.

Wire routing of plug, idling speed and full load contact, wrong pole connection or short circuit.
(Full load contact closed at insufficient rate of air flow)

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That info is taken from the manual.


Any other ideas? Anyone seen this before?

Mike

__________________
'90 300SE 298k
-300K and it gets put into retirement.
'80 300D 255k Purchased new by family in 1980.

Had a:
1973 220 (gas)
1980 300SD
1992 400E