Tag Archives: Mini Cooper Miss Fire | Rough Idle In The Morning | When Cold. Miss Fire Codes P0300

Mini Cooper Miss Fire | Rough Idle In The Morning | When Cold. Miss Fire Codes P0300, P0301, P0302, P0303, P0304

Mini Cooper Miss Fire | Rough Idle In The Morning | When Cold. Miss Fire Codes P0300, P0301, P0302, P0303, P0304

Does you Mini Cooper set a miss fire code or have a flashing check engine light when it starts up cold, in the morning? Usually code(s) P0300, and one or all of the following will set: P0301, P0302, P0303, P0304. It is most likely carbon build up in the intake valves (see picture below). With the advent of direct injection fuel systems, we have seen a epidemic carbon build up issues. With carburetor or convention fuel injection the fuel came in contact with with the intake valves while it is entering the cylinder. The additives in the fuel would help clean the carbon form the intake valve stems. With Direct Injection Fuel Systems the fuel is injected directly into the cylinders, thus leaving the intake valves susceptible to excess carbon build up. The solution: perform an Induction Service every 15,000 miles ... read more

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