So they are faking out the CIS-E brain with a constant voltage, just like a proper O2 sensor's.

Some of this is OK - you are getting about 30% KOEO, and then you get a perfect reading of almost 50% after warm-up. Under deceleration, you are going to nearly full open to divert fuel from the cylinders. The problems are that you are not getting any enrichment during warm-up or on acceleration. Maybe the brain finds this illogical.

I think that you need to get ahold of the W124 CD for the UK cars to find out what the current should be. I would call the main number which is on the Mercedes UK web site -

http://www.mercedes-benz.co.uk/ and ask for technical support.

__________________
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