In nearly every case I've seen, ignition interference on AM frequencies is
the result of a poor ground at the antenna. Repair requires unmounting the
antenna (which is easy if the antenna is in the rear fender, otherwise could
be difficult) and scraping the metal under the metallic parts of the
antenna. Scotchbrite or fine emery cloth are good for that.
The "condensor" (capacitor) in the old Kettering ignition was to allow the
points to open without bleeding off the energy in an arc across the points.
There could be a bypass condensor on the 12V side of the coil, though.
I do believe this model does in fact have a radio-suppression capacitor in
the feed wire from the ignition switch to the coil. Civic-based cars of the
same era have a cap that looks a lot like a Kettering condenser.
Motorsforum.com is a website by car enthusiasts for car enthusiasts. It is not affiliated with any of the car or spare part manufacturers or car dealers discussed here.
All logos and trade names are the property of their respective owners.