Hmm.. I'd not thought of that before. So this is an air intake valve on a DI car? Presumably the carbon is sucked in from the combustion chamber and builds up over time?
Originally Posted by ctuna
The DI cars have a design flaw the causes carbon build up over the valves.
No fuel passes over the valves. This is not unique to BMW.
This is the 335i with ~138K miles having lots of decent size repair bills right?
Six Euro Deliveries since December 1998 (Owned E46, E90, E91, E92 and E93)
28 vehicles in 26 years of driving so far. Guess I like cars
Last edited by MP3_E46; 12-04-2012 at 02:48 PM.