FSI engines doomed due to intake manifold carbon build-up ?
01-11-2010, 02:04 PM
#11
I got almost 30,000 miles on my 3.2 V6 A5 and no problems whatsoever.. it actually runs better these days.. more agile and fast. Should I be concerned? or does this notice only apply to S5's and RS4's??
01-13-2010, 02:14 PM
#13
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There's some documentation about this problem in one of VAG's patent applications regarding their DI engines. Part of it describes several methods of preventing carbon buildup. One of the solutions included performing an "Italian tune-up" to burn away the residue (I'm not kidding, there's link of the patent somewhere and I read the whole thing). Specifically, you rev it past 3k rpms for 20 minutes, and that makes the engine hot enough to clear any obstructive build-up in the intakes. It's probably a good idea to do it at least once prior to a scheduled oil change.
Got it!
01-16-2010, 12:06 PM
#15
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I can't see that this would help much if the Techron-infused fuel is injected directly into the cylinder, downstream of the valves. Unless there is some sort of concurrent port injection, such as some manufaturers have done, I don't think fuel additives will help much with this type of carbon buildup.
05-08-2011, 08:34 AM
#16
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I just purchased a certified pre-owned 2009 S5 coupe last week. I have been driving it around quit a bit, putting on about 500 miles. After my last trip to Atlantic City, the check engine light came up. I stopped by the auto parts store and they told me it was code P2004 - Intake Manifold Runner Control Stuck Open.
After some research, I found out it is caused by carbon build-up, with the solution being to clean out the intake manifold. My car is under warranty until 100K miles. I only have 28,000 miles on it now. Does this mean I'll be taking it to the dealear every 25-30K miles to get my intake cleaned?
Oddly enough, I've noticed no performance loss (granted I have only been driving it a week), and no MPG loss. I average 24 mpg to work daily (about 70% highway, 30% local) and got 25.2 coming back from AC.
Is this maintenance covered under warranty? If so, is there a deductible from work performed while under warranty?
After some research, I found out it is caused by carbon build-up, with the solution being to clean out the intake manifold. My car is under warranty until 100K miles. I only have 28,000 miles on it now. Does this mean I'll be taking it to the dealear every 25-30K miles to get my intake cleaned?
Oddly enough, I've noticed no performance loss (granted I have only been driving it a week), and no MPG loss. I average 24 mpg to work daily (about 70% highway, 30% local) and got 25.2 coming back from AC.
Is this maintenance covered under warranty? If so, is there a deductible from work performed while under warranty?
07-29-2011, 02:40 PM
#17
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less than 10K on a 2011 S5...
I have around 9,000 miles on the car and it has now been in the shop for 4 days while the dealership deals with the carbon buildup, including first attempting a fuel additive cleaner and then resorting to manual valve cleaning completed yesterday after a cold start still reported a misfire. They want to do one more cold start in the morning to verify that they don't need to also replace an injector. If they do need to, it looks like they will need to keep the car until Tuesday since (of course) they don't have the part in stock. This really sucks and makes me glad I leased if this problem is so severe that it can happen in less than 10K miles...
07-29-2011, 04:37 PM
#18
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07-30-2011, 04:41 AM
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Would the installation of an OIL CATCH CAN help solve or alleviate the problem?
Some research on the internet shows that this is a fairly widespread problem, and that an OIL CATCH CAN, installed between the PCV and the intake, can solve most or all of the problem.
See:
http://www.fitfreak.net/forums/fit-f...catch-can.html
Some research on the internet shows that this is a fairly widespread problem, and that an OIL CATCH CAN, installed between the PCV and the intake, can solve most or all of the problem.
See:
http://www.fitfreak.net/forums/fit-f...catch-can.html
