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In my new 2018 BS with about 500 miles... Occasionally I notice what sounds like a sine wave around 150/300Hz from the engine area at idle. It can be constant or periodic - on every few seconds for a few seconds, over and over. I’ve heard it when the car is cold or after a drive so no correlation with that. Off idle it stops I think but then returns when back on idle. Or it's masked by other sounds.
I don’t have much experience with turbo cars or cars with “sound actuators” like ours have so not sure if this could be due to either of those. I suppose the engine (and car) itself has resonance frequencies but seems strange that it’s intermittent and sounds so tone-like.
Should also mention that the car drives wonderfully and I don't sense anything different performance wise when this happens.
Anybody else ever hear anything like that from their 718/S or have any ideas?
I don’t have much experience with turbo cars or cars with “sound actuators” like ours have so not sure if this could be due to either of those. I suppose the engine (and car) itself has resonance frequencies but seems strange that it’s intermittent and sounds so tone-like.
Should also mention that the car drives wonderfully and I don't sense anything different performance wise when this happens.
Anybody else ever hear anything like that from their 718/S or have any ideas?