Took first step and replaced the oxygen sensor.

Positive results: better idle (480-520 in Park), engine seemed smoother, a bit more power, exhaust at idle did not smell as rich.

Neutral results: still getting lousy dwell reading, frequency valve still not vibrating.

__________________
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