Hi, new to the forum and new to Smart cars in general. I have recently purchased my first 451, 2012 Cabrio and love it to bits but for the first time yesterday after the engine had been run for a while I noticed the engine gave a Put Put Put sound rather like an old motorboat. Is this the sound they make when the engine is warm or do I have a problem? I know it's only a 3 cylinder engine but I expected a smoother sound.
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