Buzzing on acceleration

gherman · Post by **gherman** » 19 Mar 2011, 05:03

When doing a hard acceleration, I hit some metal part's resonant frequency and get a buzzing akin to a 5-needle tatoo gun. It seems to come from the engine compartment. I checked the heat shields beneath the car, and all seem intact. The muffler (resonator?) between the catylitic converter and the muffler has an outer cover that is rusting away, but I can spy no metal-on-metal vibration-causing anamoly. I tried peering in the engine compartment, but can't mimic the sound in neutral. Any thoughts?

adrock · Post by **adrock** » 06 Jul 2011, 10:36

Did you ever figure this out? My 2003 S40 displays the same symptoms.

gherman · Post by **gherman** » 12 Jul 2011, 06:25

Never found it. I fixed it by turning up the radio volume.