I don't think so. Is it a low fq type thing, cause mine makes a sound at the same rpm that I always assumed was a turbo thing. Yours is NA though right? Happens when you get back in the throttle at low speeds (ie 10-15) mph?
Hmm, sounds interesting but I've never attributed my sound to detonation. I've heard that before (on my old 'bird) and I would say that all new cars have knock sensors. Not sure on Volvo's but I HIGHLY doubt they dont.
Good luck,
Doug
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2001 S60 2.4t~82 242 Turbo 5spd~87 244 (nothing special)
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