Can someone help read these A/F ratio logs? I'm fighting a rough running problem with my 74 2.7 CIS.
At first I thought I had a fuel delivery problem, but the fuel pressures checked out OK.
I bought the Innovate LM-1 device during the fuel system investigation. I found I was running very rich. I was able to adjust the mixture closer to 14.7 and now the car starts, idles, and runs better. But I'm still getting a bucking / cutting out problem at light load / part throttle. Once the bucking starts, the only way I can get out of it is to disengage the clutch or push the gas to the floor.
The Logs looked to me like I was loosing spark, so I switched over to investigate the ignition system. My Permatune unit failed a bench test, so I procured a used Bosch unit and a MSD coil.
The Bosch unit seems to be operating OK, but I still have the problem. The car runs the same.
Thanks for any opinion of what to look for next.