Hi everyone,

I have an '82 240D and an '87 300SDL and I know that both these cars have glow plug relays that keeps time on how long that plugs stay on before start. However, does anybody know what happens when you start the car before the glow plugs go through their warm up cycle? Do they shut off after starting or do they continue through their normal cycle despite the engine already started?

Thanks

Herb
'82 240D
'87 300SDL