Post by
Jesda »
https://forums.nicoclub.com/jesda-u7038.html
Wed Nov 13, 2013 4:26 pm
Many modern BMWs also require the battery to be "mated" to the PCM by the dealer, otherwise there's the risk of overcharging the battery and disabling the electrical system, at which point a pyrotechnic safety device pops the connectors off of the battery terminal. The purpose of this is to save 1mpg with an alternator clutch that activates only as needed. I don't believe this applies to the current generation Z4 or 1-series, but I'm not entirely sure.
As for the injectors on the Q, if you're doing all of them at once then the whole plenum should come off, but if you're doing just one or two, especially near the front, then it's quick, if not entirely easy, to get in and out in less than an hour. I learned this shortcut right here on the forum.