I know our 2.0t DI engines are prone to carbon buildup. Has anyone had problems? At about what mileage did the problems occure, and when did you have the car serviced for the issue? Because of the mandated PCV valves, DI engines will alway have this problem more or less, whether or not the PCV valve was modified. From what other blogs have reported, Audi/VW's remedy which is found in the engines patent is to run the engine over 3000 rpm for twenty minutes to help remove the carbon.

 

If I am not mistaken, regular Seafoam treatment should also alleviate this.

 

Only if you can get the seafoam in the intake upstream of the valves. Remember with a DI engine, the fuel injectors are in the cylinder, and not upstream of the intake valves. So any Seafoam put into the gas tank will not have any effect on the intake valves, only the cylinder walls and exaust valves. The intake valves are closed when the fuel is injected, keeping any fuel/detergent mixture from coming in contact with the crudy upstream side of the intake valves.

 

All Audi engines have carbon problems.... FSI are even worse.

Warranty pays the tech to remove the intake manifold and manually scrape the intake valves with pipe cleaners as they soak with a de-carbonizer

 

A search after "FSI gunk " returns an ocean of scary info.

http://forums.audiworld.com/showthread.php?t=2772926

Audizine has the most comprehensive discussion.

As one could note, even cleaning at every oil change (intake manifolds off) iis not a cure..

For the fast thinking members=> there are deposits - gunk free engines =>2.7T,
get one low mileage -
comes complete with drive train and body assembly.
PM me if you are forward thinking

 

i've never had any problems. any engine using cheap gas can have carbon build up. use gas from a station found in www.toptiergas.com

most stations out there don't add enough detergents to their gas-which leads to carbon buildup.

 

Muchos gracias for that link.

 

Unfortunately no matter what gas you use, the engines will still carbon up eventually. People on other forums have reported using nothing but Top Tier gas, and buildup still occures. The intake valves are upstream of the injectors, so no amount of a gas/cleaner mix will prevent the problem. If these engines were port injected, then the gas/cleaner mix would be forced to pass over the intake valves cleaning them.

 

Edit1

 

A very good friend who works in the service dept of the Audi dealer here says he does not see many A4s come in with this problem. I have driven A4s for many years and have not noticed anything different. Carbon may be building up but I am not noticing the effects and that includes a 10 year old car. Still drives great but I also use this as basic transportation and not for performance racing. That could be a difference. I do run top tier gas plus valve cleaner.