Quote Originally Posted by earplug View Post
Anyone have to walnut blast intake valves on a gasoline direct injection engine?
How common of a issue is this?
Audi A4 seems to be a maintenance item at 100k or less. But the amount of crud I found on the one I maintain was meh.
My Hyundai engine is gdi too and folks go anywhere from 75k to never.

Considering how costly that can be I would make sure it?s really needed. The A4 folks who did it say there really was no noticeable improvement. YMMV