it's prob in open loop .sounds like you need to lean down the mixture or richen it up.those o2 lights were meant to advise that the mixture was stuck at one end [low numbers=lean high numbers=rich] you will need to adjust 3mm to change the setting back to the correct one.

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David S Poole
European Performance
Dallas, TX
4696880422

"Fortune favors the prepared mind"
1987 Mercedes Benz 420SEL
1988 Mercedes Benz 300TE (With new evaporator)
2000 Mercedes Benz C280
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