Thanks to all who responded, Stevebfl, do you know if the duty cycle values are the same for the 86 M102's and M013's? I have the factory book for my 86 190E 2.3-8 valve, are they "standardized" between engines? Or are the 6 cylinders different? It seems that the two would be similar given all the other similarities found on the 4's and 6's........Thanks again.