Lambda results questions
I recently checked the lambda value on my '91 190E 2.3, looking for answers to a rough start and sluggish acceleration. I was using a Fluke 87 to measure the duty cycle and the results are confusing me. Rather than the 45 - 50% I was expecting, the duty cycle varied a great deal. values would bounce from 0 to 100, then drop quickly through the range, with values in the 80's. 50's, 20's etc. Then the cycle would repeat with lots of variation. I had a good chassis ground and a good connection to #3 pin on the diagnostic plug. The engine was also warm, at 80C. The car doesn't really run bad, just a bit rough on idle and a bit weak on the acceleration. The engine has 148K on it. Any suggestions as to where to check next. I haven't checked the EHA current yet, but will look at it this weekend to see what the controller is actually doing. Any thoughts you may have would be appreciated.
'91 190E 2.3