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Old 08-31-2012, 07:55 AM
cssnms cssnms is offline
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Location: Murland
Join Date: Jan 2011
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Mein Auto: '11 335d
Originally Posted by KeithS View Post
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.
Which begs the question why BMW appears to have increased the duty cycle of the EGR valve. Just a guess but wouldn't that let more soot into the cumbustion chamber?

Re walnut blasting -- Replacing a head is less expensive??? I thought I remember some member stating it was a couple of grand to replace their head had they needed to pay for it outside of warranty. Walnut blasting is only a few hundred bucks.
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