After more reflection, I think you need to focus on the 11mA reading at hot idle. That is just 'way too much enrichment. On a cat/lambda car, we would have a go at the mixture and read the on/off ratio of the lambda control valve.

But in your case, I think what is happening is

a. the CIS control unit is getting a bogus signal telling it to enrich. This could come from the air or throttle position sensor, temp sensor, or a vacuum sensor (if it has one).

b. the control unit has gone around the bend - the KOEO current is wrong, and it should not be sending anything with key off. If my suspicion is right - that the correct KOEO reading should be 0 like the 103.980 - then a hot idle reading 11 mA too high may be more than a coincidence.

And, I would not rule out a vacuum leak somewhere as a culprit or contributor.

__________________
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe