11-05-2020, 02:54 PM
I'm not sure the problem with "varnish" on the plugs only happens with stale fuel.
I was led to believe that with modern cars the ecu will ensure that the mixture never gets over rich so the plug manufacturers now save a farthing or two by not applying a ceramic coating to the internal plug insulator. However if we over use the choke and flood the engine then the plugs varnish up.
I was led to believe that with modern cars the ecu will ensure that the mixture never gets over rich so the plug manufacturers now save a farthing or two by not applying a ceramic coating to the internal plug insulator. However if we over use the choke and flood the engine then the plugs varnish up.