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Originally Posted by AndreiFS
... With the car off but key "on" the duty cycle read 31.2 steady with the engine cold. What is going on?
PS. The car only misfires at full operating temperature.
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That means the leads are reversed (should read 70%) I had the same problem when I first tested my duty% the positive lead in the #2 pin and the negitive lead in the #3 pin will give the correct reading... (something about mercedes useing reverse duty cycle) So your real percetage is heading toward 0 (richening)
Does the car misfire with the o2 sensor unplugged? (fully warmed up) If not try unplugging the coolant temp sensor.