Good question. My 450 cabrio occasionally does this as well. My only assumptions are a bad ground or a bad alternator, but I'm really not sure.
My bad then thought it was like mine 453 0.9T 😁The cars above are not 453s....![]()
My 2010 Smart 451 slowly developed rough idle over the last 5 years. It is getting worse with time, thus something must be wearing out or slowly failing over 5 years. It only has 110,000 Km (66,000 miles), so that seems too young to be having such issues.That’s possible solenoid failure.known issue for rough idle
453 Rough Idle | Evilution
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