[ChrisBennet]

Sure it's expensive but I doubt the garage made much profit from his visits.

One of the things you pay for when you go to a mechanic is being able to pick the car up the next day. Garages, even Porsche specific ones, don't stock every part. Instead, they get it the same day or overnight from a parts distributor. You know, those little pickups from "Acme Import Autoparts" you see driving around.

They don't want to diagnose your car, pull the injectors and then wait a week for them to get cleaned. Meanwhile you car is taking up a lift or they have to push it off someplace and bring it back when they're ready. I've had electronic injectors come back from being cleaned and flow balanced and had one stuck closed. Spent a lot of time diagnosing that and ended up just getting new injectors.

-Chris