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Nice one 👍

Hello Carl, The coolant temperature sensor will not affect the actually running temperature of the coolant i.e. the cooling system works as it should do and the operating temperature will stay at normal when up to the operating temperature. What this sensor does is to simply monitor this temperature and signal it’s varying resistance value to control the fuel mixture. Coil packs? I would expect the that if these were suspect, you would was experience missing associated with the black smoke. Injector issues?? Kind regards, Gareth.

Hello Carl, I’m not saying this is the offending component with your car, but faulty coolant temperature sensors can give similar issues. They work on the principle that they sense the coolant temperature and signal the ECU to set the correct mixture for that temperature - rich when cold, lean when hot. If they fail, they do so to an arbitrary resistance value which can result in over rich mixtures when hot, and indeed too weak when cold. Does the car start instantly from cold? Kind regards, Gareth.