My beemer wants a drink shaken not stirred (engine detonation, pinging, rattling)

Since Mexico I noted strange noises from the engine (detonation, pinging, rattling) and in Colombia it got so bad that I asked for advice from one friend in Finland and went to the BMW dealer (Ruta40) in Medellin to ask for help.

Self-made jumper instead of BMW grey-plug for 91Octane fuel. The jumper bridges pins 6-2-8.