Sorry to disagree Larry, but I'm pretty sure the M103 engine does not have a knock sensor, at least not the early ones. I have an '86 and I've had two different ignition modules in it, and in both cases the engine knocks under moderate to heavy load at low to mid-range rpm even using 91 octane CA gas (with ethanol).
I wish it did have one so I'd have less to worry about as I can't seem to eliminate the problem. Eventually I think I'm going to have to pull the head and decarbonize everything. Where are you getting your info that there is one on these cars, and where is it supposed to be physically located?

Gary