servus mein essi kann whistlen. Sounds maybe funny, but is unfortunately like that. That would be funny, if there is not a small power loss yet. Achso, Bj:97; 1.6 16V. The whistle comes but only from 3500 rpm and only under load (which is not important in the course), the whistle is not listening in idle. I checked the whole underpressure system, hoses is ok. Nix broken, cracked and nothing yet the old covered covered cover. I then once got the crank-house the ventilation valve was already installed ( 30 euro ) , did not help and the whistle has remained . While still changing the idle control , hope this helps against the small power loss ( are children’s diseases ) . You can give me many tips , what this is about with the whistle . mecdoc Can only answer on tips tomorrow evening .