4 ms·
> And it'd be very bad if the sparkplug was live while you tried to change it, so you also needed to know where your car's battery was and how to disconnect it.
by u801e 7y ago
> And it'd be very bad if the sparkplug was live while you tried to change it, so you also needed to know where your car's battery was and how to disconnect it.
I haven't worked on cars old enough where this would be an issue, but, as far as I know, all you need to do is disconnect the ignition coil before removing the spark plug.
- nostrademons 7y agoYeah, that'll work, it's just that the ignition coil is usually harder to reach than the battery. (I think actually the preferred way to do it, safety-wise, is to disconnect the ignition coil.)
- robocat 7y agoI can't imagine how you could get a shock off an engine that isn't running... 60s tech was rotor and coil. Modern tech needs running ECU. Also AFAIK the spark is mostly just painful and not particularly dangerous (memory of spark plug lead with cracked insulation). I have also had a shock from a charged CRT tube (youch!), and the occasional 240V mains shock (careless me).