Blew my R8 engine.......AGAIN
11-03-09, 01:06 PM
#46
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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.
11-03-09, 01:13 PM
#47
Lexus Test Driver
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; 11-03-09 at 01:18 PM.
11-03-09, 01:41 PM
#48
Lexus Champion
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.
11-03-09, 09:54 PM
#50
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
11-04-09, 05:58 AM
#51
Lexus Test Driver
Yes, thats correct, if the build is minor, they can run the solvent thru the intake to clean off the carbon.
11-04-09, 06:10 AM
#52
Lexus Fanatic
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should have got a gt-r. i keed i keed. 
11-04-09, 09:28 AM
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11-04-09, 12:16 PM
#58
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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; 11-04-09 at 12:20 PM.
11-04-09, 12:17 PM
#60
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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.