Carbon Build Up on Volkswagen CC

There have been several reported instances of carbon build-up in Volkswagen direct-injection motors. Use of premium fuel is recommended, along with allowing the vehicle to fully warm up during drives.

Severe carbon build-up can cause several issues such as rough cold idle, hard starts, decreased acceleration, misfires, black clouds under hard acceleration, and the illumination of the check engine light.

Repair of this condition once severe requires the physical cleaning of the intake manifold and intake ports on the head. Due to its time consuming nature, this repair can be expensive.