(C Kingsbury) wrote in message . com...



I'm going to call the shop Monday to have the plugs checked, is there
anything else this sequence of events suggests to anyone? Airplane in
question is a 1979 C172N, engine tach time about 1800.

Have the P lead connections checked for looseness, check any RF
filters for loose connections, have the indivisual plug leads check
for high voltage leakage and have the mag output voltage checked too.
A weak or degraded spark will not promote full combustion in the
cylinder and will lead to rapid fouling.

If they don't have the test equipment, swap mags and check. If the
problem moves, it's a mag problem. If it goes away, it was a loose
wire or connection.

Craig C.