Audi FSI flaw

1BMW4fun · 04-06-2009, 08:56 PM

Interesting, I came across a number of threads regarding problems with carbon buildup / carbon deposits and the cars throwing CEL codes for misfires. Some cars reporting losing as much as 20-30hp. It turns out that the FSI technology VW/Audi is using has a flaw.

Basically, because the fuel is sprayed directly into the combustion chamber, the valves accumulate dirt from the blow-by oils, etc and cause a buildup of carbon deposits. Some fixes have required replacing the valves. For others, it’s been to remove the intake manifold and use solvents and shell blasting the valves as needed (as early as 6000 miles).

http://forums.audiworld.com/showthread.php?t=2745246

http://forums.audiworld.com/showthread.php?t=2746852

http://forums.audiworld.com/showthread.php?t=2745791

http://www.bobistheoilguy.com/forums...Number=1414263

GTM · 04-06-2009, 11:18 PM

Not just FSI...
Quite many of Audi/VW engine had problems with sludges and too much blow by gas causing carbon deposits.

footie · 04-07-2009, 02:17 AM

I have had quite a few FSI engined cars few the last few years, there is currently two GTI Golfs and last year I changed my S5 for the M3 and almost all have covered between 9000~23000miles with none of them ever suffering any problems due to carbon deposits or in fact anything remotely connected to the engine at all.

Maybe it's a rare problem that's multiplied by the freedom of the Internet, after all the lag caused with the M-DCT isn't the worst thing in the world but this forums has pages and pages relating to the subject. Things always need to be put into perspective.

04-06-2009, 08:56 PM	#1
1BMW4fun Second Lieutenant 37 Rep 252 Posts Drives: 12 X3 2.8, 11 550 Join Date: Jan 2009 Location: CA iTrader: (0)	Audi FSI flaw Interesting, I came across a number of threads regarding problems with carbon buildup / carbon deposits and the cars throwing CEL codes for misfires. Some cars reporting losing as much as 20-30hp. It turns out that the FSI technology VW/Audi is using has a flaw. Basically, because the fuel is sprayed directly into the combustion chamber, the valves accumulate dirt from the blow-by oils, etc and cause a buildup of carbon deposits. Some fixes have required replacing the valves. For others, it’s been to remove the intake manifold and use solvents and shell blasting the valves as needed (as early as 6000 miles). http://forums.audiworld.com/showthread.php?t=2745246 http://forums.audiworld.com/showthread.php?t=2746852 http://forums.audiworld.com/showthread.php?t=2745791 http://www.bobistheoilguy.com/forums...Number=1414263
	Appreciate 0 Tweet Quote

04-06-2009, 11:18 PM	#2
GTM 68 Rep 1,034 Posts Drives: E92 M3 Join Date: Aug 2008 Location: Crystal Lake, IL iTrader: (2)	Not just FSI... Quite many of Audi/VW engine had problems with sludges and too much blow by gas causing carbon deposits.
	Appreciate 0 Quote

04-07-2009, 02:17 AM	#3
footie Major General 1228 Rep 8,034 Posts Drives: i5M60 Join Date: Oct 2007 Location: No where fast iTrader: (0) Garage List 2024 BMW i5M60 [0.00] 2022 BMW i4M50 [0.00] 2020 BMW M5 Competi ... [0.00] 2008 E92 M3 [0.00]	I have had quite a few FSI engined cars few the last few years, there is currently two GTI Golfs and last year I changed my S5 for the M3 and almost all have covered between 9000~23000miles with none of them ever suffering any problems due to carbon deposits or in fact anything remotely connected to the engine at all. Maybe it's a rare problem that's multiplied by the freedom of the Internet, after all the lag caused with the M-DCT isn't the worst thing in the world but this forums has pages and pages relating to the subject. Things always need to be put into perspective.
	Appreciate 0 Quote