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I experienced similar sound from my '02 C2, but never any smoke. It turned out to be the secondary air compressor which kicks on periodically hence the intermittent noise. Might be worth checking on, you can do that by disconnecting the power leads (with engine off of course) and applying power to operate the compressor. There is a tech article on changing this here in Pelican. I purchased the replacement through Pelican at substantial savings vs dealership and replaced it myself. Good Luck!
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