Hallo 126-iger Gemeinde, Since it is here in Switzerland far below minus, I have the following problem with my 500 sec 1st series without cat when starting in cold condition: 1. It starts, but has to turn it 3-4 revolutions more than usual. I.e. in warm condition it needs a change and then runs immediately. 2. When the car has started, I have to hold it about 1 minute with gas to 1000 revolutions. Then it runs quite normal. I do not hold the gas, then it goes immediately again Can this be the kart start valve? Have you heard that the cold starter is only in connection with the cat?? Where is the part sitting exactly? Standing in front of the engine – the part with the blue plug, right in front of the air filter? Must the part be replaced – it can be cleaned or repaired. According to MB here costs CHF 500.–! Does anyone have experience with it? Thanks and Gruss Reto