Hi My VW Lupo 1.0 37kw First registration 01 Engine identification AUC only starts after 5-6 times orgs. Then comes out of the exhaust white smoke and it jerks briefly, after giving again gas it runs normal. After 3-4 hours of service life the same again….The following was already renewed or made for this reason : New fuel pump Green double temperature sensor spark plugs throttle valve cleaned up new cooling water (because there was only little left ) Via a bridge cable the engine was started from another car Everything helped nothing