I have read just about everything I can on adjusting the mixture and reading the duty cycle - and I am still lost!

Just took some additional measurements - I put the red lead on pin #3 and the black lead on pin #2 and I get a a static reading of 69.9% - so far so good. Start the car and readings fluctuate around 50% until the car reaches operating temp - then readings go from 33%-41% at idle and 35%-43% at 2500 rpm. So I'm running rich, right?

So I check the volts and they read 4.7v-5.7v at idle and 5.1v-5.9v at 2500 rpm - BUT, according to the Landiss formula that doesn't make sense! A 4.7v reading should correspond to a 66% duty cycle and 5.7v should correspond to a 58% duty cycle - backwards of what I am getting! What's going on here?

I have read about some folks getting opposite readings with red on 3 and black on 2, but I'm getting the correct 70% static reading with red on 3 and black on 2...

I'm lost?

ryan

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RG Newell

1984 300D
1972 250
1986 560SL
1991 300CE