Smart Fortwo intermittent starting issue with engine overheating and rough running on Smart Fortwo

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Smart Fortwo owners report experiencing intermittent starting problems, which may be caused by a weak battery or a faulty ignition coil, leading to hard starts and rough running. Additionally, engine overheating has been reported, often attributed to issues within the cooling system such as low coolant levels or a malfunctioning thermostat. Furthermore, rough running of the engine can result from worn-out spark plugs, problems in the fuel system, or issues with the ignition system. Owners are advised to inspect these components regularly and address any issues promptly to prevent further damage and ensure optimal vehicle performance. If problems persist, consulting a qualified mechanic or technician for a thorough diagnosis is recommended.

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