Brief update:

Checked the operation of the O2 sensor as described on this forum and I don't think it is working properly. I got the car warmed up and just as the reading on my multimeter starting fluctuating between .5v and 1.0v - I heard a click from the motor - somewhere, but it was definitely noticeable. After that, the readings quit cycling completely - stuck on 1.04v and it stayed there at 2500 rpm's.

Am I on to something here? And, if so, what?

I should indicate that this is a relatively new, direct replacement Bosch O2 sensor - replaced about 2 years and 15K miles ago.

Ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE