rustfreenz 0 Report post Posted October 13, 2017 Hi all, Just trying to get started on my m40 to m42 engine swap. however, I cant find a definitive wiring diagram for the M42 - i have the loom, i just dont know exactly which wires are for what. if i knew this it would be much easier. cheers. Quote Share this post Link to post Share on other sites
turbolizard 38 Report post Posted October 13, 2017 Check out this site. I think you wlll find a lot of useful info there. The page linked below is for ECU pin outs, but there are many pages of info on wiring colour codes and connectors etc... http://www.e30zone.net/e30zonewiki/index.php/ECU_Pinouts Quote Share this post Link to post Share on other sites