335i with a N54 with carbon build up,,,,car ran ok,,,,but you could notice a rough idle,,,,which was caused by to much carbon build up on the intake valves,,,,,when removing the intake manifold,,,,remember to also remove the manifold studs,,,,removing the stud helps out a lot when removing the manifold. Here you can see the build up on the intake valves. We use walnut shells to clean the valves,,,,using walnut shells is nice,,,but it leaves a big mess and its a lot of work,,,,I have done this repair at home for some friend,,,,I have used some good intake valve cleaners and I would turn the motor over until the valves are closed,,,,then pour the cleaning solvent inside the intake and soak the valves,,,once done soaking,,,,I would use a long pick to chip off the carbon,,,,,some of the picks I use look like dentist tools,,,,it takes some time but you can do this job at home.
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