Hello Smartis, my smart: 110 tsd. km 451er Cabrio Benziner Last inspection 10 months ago Problem: Yesterday still parked in the garage, this morning a noise not clearly to be declared for me. 1. Key pure 2. foot on the brake 3. gear to idle 4. Key repositioned 5. Would say he tried to pull tank, but did not jump to Hab then waiting several minutes and tried it again. Well, thought the spark plugs are over. ADAC called, which gets in and the car runs. Here is the video where the noise is very good to hear:https://youtu.be/keHFGkR9B_U Hope you can help me …. Thank you! Greeting Andy