2009 A4 TSI

[Cody Forbes]

Correct and incorrect all in one! Yes, they are direct injection. Don't forget though that you'll always have some reversion and that there is plenty of oil vapor coming through the ventilation system. What there is not is any gasoline, which is an excellent solvent, being sprayed in the ports to wash them off. 

-Cody Forbes (mobile)

On Jun 6, 2014, at 1:55 AM, "urq" <urq at pacbell.net> wrote:

> I thought these cars used "direct injection" ... i.e. the fuel is injected
> into the cylinder directly as in a diesel motor ... nicht wahr?  It seems to
> me that in a direct injection engine all that would be passing through the
> intake valves is air ... perhaps with a little oil vapor ... 
> 
> Of course the exhaust valves would be a different story ... altogether ...
> 
> Steve Buchholz
> 
> -----Original Message-----
> From: quattro-bounces at audifans.com [mailto:quattro-bounces at audifans.com] On
> Behalf Of John Larson
> Sent: Thursday, June 05, 2014 1:42 PM
> To: quattro at audifans.com
> Subject: Re: 2009 A4 TSI
> 
> On 6/2/2014 11:51 AM, Nick Lawrence wrote:
>> Hello,
>> I moved up about 2 decades in Audi technology and am getting a 2009 A4 
>> Avant TSI.   I would like to know If there are knock sensors (most 
>> likely), and how they function.
>> Meaning if there is knock does the computer make changes and if it 
>> continues to knock create a stored code?
>> Is there ever any driver visible indicator that there is engine knock?
>> Any insight will be appreciated.
>> Nick   central Ohio
>> 
>> 
> While I didn't work at a dealership in recent years, and I'm in a relatively
> small city and had only a few FSI cars pass through my shop, I wouldn't own
> one of them on a bet.  I'm guessing the TSI engines are essentially the
> same, although updated, design.  While (when I was in the business) I could
> offer only anecdotal commentary on this engine, I have found over the past
> few years that I wasn't the Lone Ranger on my negative opinion of the
> technology as applied by VAG.  Reading the help requests on iATN and
> following the trade magazines has revealed that decarbonizing of the valve
> stems, usually by media blasting, is pretty much required every 40-50K
> miles.  This means you have to remove the intake manifold (not an easy or
> quick job on the 4 cylinder turbos), blast the stems of the closed valves
> (and turn the engine to close the valves on successive cylinders).  You're
> looking at 5-10 hours labor + any gaskets, broken plastic hoses or
> connectors, whatever.  When independent shops are buying the equipment to do
> this job, you KNOW it's a profit center because it has to be done.
> 
> John
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