new b6a4 owner -- what do I need to know?

[NIck Miller]

Seafoam or similar product through the intake tract via the brake booster or
other intake line would help id bet.  Usually you'd do it in the fuel but as
mentioned,  Direct Injection is the cause of the problem.  This isn't the
only car with this problem, but the mazda DI cars don't seem to deal with
this, oddly.
On Jan 12, 2011 7:41 PM, "Bill Janssen" <bill at janssen.org> wrote:
> John Larson <j.d.larson at verizon.net> wrote:
>
>> The 2.0 FSI engine has an interesting problem. Because fuel never
>> touches the intake valves, carbon builds up. Left untreated, bits of
>> carbon are prone to breaking off and occasionally getting caught
>> between the valve and its seat. When this happens, the valve bends
>> because the clearances are so tight in there that the piston "kisses"
>> the valve. I've heard of some shops that pull the manifold every 40K
>> or so and manually clean the valve stem and the back of the valve
>> head. Book time to R&R the manifold is around 4 hours, and I'm
>> guessing another 2 for the cleaning of 8 valves. We've seen one do
>> this, and we only have 2 that come in on a regular basis. We had to
>> replace the engine because there was scoring in 2 cylinders and one
>> bent valve. I'm guessing carbon caused the scoring. Personally, I
>> don't see a 2.0T, or any other car with an FSI engine,in my future
>
> Good lord! Thanks for the tip.
>
> Bill
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