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post #11 of 15 (permalink) Old 11-16-2012, 11:30 AM
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A little soot on the exhaust is inevitable. Don't worry about it if the car is running fine.

In the old days, when things like that bothered you, you could pop the hood and play around with the little screws on the carburetor until you had a real problem. Fortunately that is no longer possible.
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post #12 of 15 (permalink) Old 11-16-2012, 09:18 PM
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Originally Posted by igotzzoom View Post
Besides, I've heard some real horror stories about early VW and Audi direct-injection engines that got major carbon buildup on the intake valves,

this is still a problem... a $5000 problem with the 2009-2012 3.2 v6 Q5. covered under warranty, but it seems to happen to a lot of guys just after warranty expires, then it's all out of pocket. alternative is just to live with the bright yellow cel light until you want to sell it. audi's solution is to ditch the engine design and go forward with the 3.0 turbo in 2013.

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post #13 of 15 (permalink) Old 11-18-2012, 07:55 AM
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It's normal. Turbo engines run a tad richer as stated before. I wipe my tailpipes down every few days as well. A/f ratio on WOT locks in around 10.7-11:1 on my Sonata Turbo. Cruising around its about 14:1 to 14.2:1
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post #14 of 15 (permalink) Old 11-19-2012, 11:25 AM Thread Starter
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my concern was not the soot or anything related to engine running fine. I just thought that maybe because everyone was so concenred about the fuel efficency that this could be one of the reasons for the higher fuel spend. I have been driving turbos cars for a while and understand how they work. My question was to see if the extra fuel mix would result in a higher fuel consumption. The turbo runs great and I am happy with it.
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post #15 of 15 (permalink) Old 06-03-2013, 04:55 PM
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I think it's normal. My Genesis Coupe V6 did this, too.

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