Blew my R8 engine.......AGAIN
Carbon build up behind the intake valves is a common with all direct injection engines.
The problem is that, with a direct injection system, the fuel is introduce in the combusion chamber, therefore the detergent in the gas cannot get behind teh vlaves to clean that area like a regular fuel injected engine. The exception is the Lexus direct injection engines, which use both direct and port injections.
The problem is that, with a direct injection system, the fuel is introduce in the combusion chamber, therefore the detergent in the gas cannot get behind teh vlaves to clean that area like a regular fuel injected engine. The exception is the Lexus direct injection engines, which use both direct and port injections.
Not really more harmful but just more maintenance. They can clean that carbon off with a blast of solvent or sand blast it off with crushed walnut shells if it is real bad.
Last edited by The G Man; Nov 3, 2009 at 01:18 PM.
That's if the heads are off for a rebuild. You can suck in a cleaner like GM Top Engine Cleaner, Mopar Combustion Chamber Cleaner, or a good induction system cleaner, heck even water CAREFULLY via the intake system to clean off the valves.
This is going to turn me off to Audi more. I knew the older Audis were unreliable but I guess nothings changed but the date. No matter how much you love a car or how well it performs , this will turn you the hell off. 2 engines??? when was the last time you heard anything like that from a Japanese manufacturer. Now that I think of it I don't even think I would expect 2 blown engines from an American manufacturer
Yes, thats correct, if the build is minor, they can run the solvent thru the intake to clean off the carbon.
That's close enough for me.
http://ww2.lexus-lfa.com/index.html
http://www.audi.ca/ca/brand/fr/model...container=page
Last edited by FisforFast; Nov 4, 2009 at 12:20 PM.
I'm not stating this as fact but if the LFA could keep you from transplanting several engines and prevent you from making the dealer buy the car back and all of that other hassle, I'm sure somebody in this world could see the value in that.
Indeed it definitely sounds like a common problem for the 4.2L FSI engine. In hindsight, Toyota's D4-S system which is a combination of port and direct injection is a very good idea, as it effectively prevents carbon or oil build-up in the valves.
May I ask where you got your crystal ball from, that can predict the future

?
Please don't list paper specs, as those do not indicate *real-world* performance.
May I ask where you got your crystal ball from, that can predict the future


Please don't list paper specs, as those do not indicate *real-world* performance.







