Volvo 850 Brummen beim Gasgaben Good evening, I have a question I drive a Volvo 850 144ps automatic with Kat cold-running regulator on Euro 2. When giving gas, the Volvo is already buzzing quite well and I wonder if this is normal? My mechanic thinks the exhaust and fan manifold is fine and that could be normal that it is so buzzing. I also had a 850 with switch before and it didn’t buzz like that. Is it automatic? In a thread over a Mercedes, a flush to Tim Eckhard is recommended.