Chuck, let me ask you about that. I think that my 88 560SL does the "rythmic" thing you describe. I have followed it using the procedure you described in one of your posts to check the duty cycle and what I see is the duty cycle moving slowly away from 50% percent, rpms increasing, then it correccts itself to around 50% (rpms down) and the cycle repeats itself. It takes about 10 - 20 seconds. I always thought that this was normal. Do I understand you right in that it is not and that I need a new oxigen sensor?
Thanks.
Jl
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