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Old 08-31-2012, 07:33 AM
KeithS KeithS is offline
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Location: Central NJ
Join Date: Dec 2001
Posts: 1,892
Mein Auto: '11 335d, '17 340iGT
Originally Posted by cssnms View Post
I wonder what impact this partially restricted EGR vavle had on soot build-up in the combustion chamber and more specifically the build-up that some members stated lead to the replacement of the heads in several cars.
I had assumed everyone was aware the soot was the root of the recall, my SA had read me the details of the TB. And they way I figure it, it was those who drove a lot and accumulated lots of mileage quickly, ending up needing a head replacement are the ones that triggered the redesign/recall. I believe the soot just plugged up everything (EGR, Intake and heads). So we can thank these road warriers for preventing the problem from occuring for the rest of us, although at an apparent loss of fuel economy.

I asked the SA about walnut blasting the heads to clean them. He said while that would work, it was still less expensive just to replace, rather than clean the head and intake.
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