Car: 2017 Civic 1.5 turbo sport +
Join Date: 27th February 2010
Thanked 19 Times in 19 Posts
Leaving the ignition on with a modern petrol engine won't burn out a coil as there is no signal from the ecu to fire it. Years ago when most cars used contact breaker points if the points were at closed position at the time with the ignition on this would give the coil a constant 12v which then cooked the coil if the ignition was left on for long periods.Diesels do not use a coil as there are no spark plugs, diesels only rely on high compression to fire the fuel,the injector i suppose acts like a spark plug only injecting at the right time just btdc. Diesels only have heater plugs which are only used when first start up from cold,most of the time honda diesels don't really need them as direct injection engines start a lot better than indirect injection engines.