If you disconnect the pulse generator from Number 6 cylinder wire, what happens?

I accidentally left it disconnected and noticed the car running rich a little while after that. However it seems to have sorted itself out after a bit of driving.

http://www.realoem.com/bmw/showparts...49&hg=12&fg=05
09PULSE GENERATOR
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Anyway, I tried connecting it again and the car didn't even want to start. It did after 30secs cranking but then ran like it was on 4 cylinders (except at idle where it ran at 1200rpm instead of the usual 750) I could also smell that it was burning way too much fuel. Disconnected the sensor and it started fine as if nothing had happened.

So now I am running with it disconnected. I might try doing a shogun reset and then try reconnecting it again.

It seems to run fine as it is though, no alerts, nothing weird. and it really hammers... What is the pulse generator for, does anyone know?

Cheers, Nick