Konstatntin Bogach wrote: > > Where is auxiliary vacuum pump located? What is its function? > The noise is very loud and if something can clack beside lifters I would > check it out. start here... http://www.endosquid.com/audi/aud4kfix_vacpum.htm different car, same part in same location... -- Huw Powell http://www.humanspeakers.com http://www.humanthoughts.org