Carbon buildup is a problem with BMW direct injection engines especially N54 and N55 type turbocharged engines. Al's Motorrad offers BMW and Mini intake valve carbon cleaning service using walnut blasting method. This cleaning is recommended to be done every 50-60K kms.
Call 416-451-4006 for more information or to book your walnut blasting service.
Symptoms of heavy carbon buildup - rough idle and no check engine light, misfires, loss of power during acceleration, power lag.