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#3129245 - 09/19/13 06:20 AM Keep carbon buildup out of the engine?
horse123 Offline


Registered: 09/06/13
Posts: 920
Loc: Portland
2012 Audi A7 3.0T. Recently they sent out a notice about a warranty extension because of excessive carbon buildup on various parts of the engine. I'd much rather keep the carp out of it now, than pay someone $5000 to professionally decrap it later. What fuel additive could/should be used and how often?


Edited by horse123 (09/19/13 06:23 AM)
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#3129251 - 09/19/13 06:28 AM Re: Keep carbon buildup out of the engine? [Re: horse123]
rfeir Offline


Registered: 07/13/11
Posts: 209
Loc: NY
May be related to its application of direct fuel injection. The industry is always working on new fuel formulations to address this issue. Use a Name Brand fuel.
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#3129261 - 09/19/13 06:39 AM Re: Keep carbon buildup out of the engine? [Re: horse123]
demarpaint Offline


Registered: 07/03/05
Posts: 25351
Loc: NY
Originally Posted By: horse123
What fuel additive could/should be used and how often?


Good luck finding one that can be poured into the tank and help a DI engine stay carbon free if that particular engine design is prone to that problem. For the best results it would have to be fed via a vacuum line. An Inverse Oiler would probably help. Clevy and I mentioned this a few times. You might want to look into an Inverse Oiler.
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#3129281 - 09/19/13 07:06 AM Re: Keep carbon buildup out of the engine? [Re: horse123]
bourne Offline


Registered: 12/20/06
Posts: 1392
Loc: Greenwood, IN
Top Teir 91~93 octane gas, occasional Redline SI-1/Techron treatment and weekly Italian tunes for a good 20~30 miles should keep it to the minimum.
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#3129290 - 09/19/13 07:25 AM Re: Keep carbon buildup out of the engine? [Re: horse123]
badtlc Offline


Registered: 06/08/06
Posts: 4979
Loc: KC
Originally Posted By: horse123
2012 Audi A7 3.0T. Recently they sent out a notice about a warranty extension because of excessive carbon buildup on various parts of the engine. I'd much rather keep the carp out of it now, than pay someone $5000 to professionally decrap it later. What fuel additive could/should be used and how often?


Any PEA cleaner (Techron, Gumout, Redline, Amsoil, etc.) used regularly will help keep the combustion chamber and injectors clean. That is an important step #1.

Then, keeping the RPMs up above 4500 or so for 20+min at a time will help keep the intake valves clean. This does not have to be done at high speeds, regular highway speeds (70-80mph) are fine. This has been shown to be very effective. I think steady speeds at highway are better than full throttle/high RPM applications due to the different combustion modes the DI engines have and some of these modes block of the EGR.


Edited by badtlc (09/19/13 07:26 AM)
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#3129300 - 09/19/13 07:36 AM Re: Keep carbon buildup out of the engine? [Re: horse123]
Miller88 Offline


Registered: 04/09/08
Posts: 11012
Loc: Onondaga County
It does not matter what you put in the tank, the fuel does not go past in the intake valve in a DI engine, but crud sucked through the PCV is.

Spraying slight bits of water or italian tuneups seem to be good ideas.

DI engines usually have higher compression right? I'd be concerned about using something like seafoam in a higher compression engine!
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#3129310 - 09/19/13 07:46 AM Re: Keep carbon buildup out of the engine? [Re: horse123]
stockrex Offline


Registered: 01/08/06
Posts: 2104
Loc: Michigan
They have BG Chem tool but the best addy for keeping carbon out is NOT to drive it.
if you use any carbon dislodging addy, you will probably clog up stuff down the line.
remember, the hardest thing for an engine is to run when cold, so stop making short run throughout the day and make a long run,
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#3129319 - 09/19/13 07:53 AM Re: Keep carbon buildup out of the engine? [Re: horse123]
SEMI_287 Offline


Registered: 02/25/11
Posts: 1172
Loc: Up State NY
PCV catch can perhaps?
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#3129388 - 09/19/13 09:08 AM Re: Keep carbon buildup out of the engine? [Re: SEMI_287]
badtlc Offline


Registered: 06/08/06
Posts: 4979
Loc: KC
Originally Posted By: SEMI_287
PCV catch can perhaps?


Catch cans do not help. Plenty of proof of that showing they do not help.
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#3129391 - 09/19/13 09:10 AM Re: Keep carbon buildup out of the engine? [Re: Miller88]
badtlc Offline


Registered: 06/08/06
Posts: 4979
Loc: KC
Originally Posted By: Miller88
It does not matter what you put in the tank, the fuel does not go past in the intake valve in a DI engine, but crud sucked through the PCV is.


that isn't completely true. gas cleaners indirectly do help. The crud coming through the PCV comes from highly volatile oil. The oil becomes increasingly volatile due to fuel dilution. Using fuel system cleaners to keep the combustion chamber clean and the injectors clean, helps to insure better combustion and a more complete burn. This helps reduce the fuel that makes it to the oil and helps preserve oil quality and reduce PCV vapors.
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#3130330 - 09/20/13 06:34 AM Re: Keep carbon buildup out of the engine? [Re: horse123]
horse123 Offline


Registered: 09/06/13
Posts: 920
Loc: Portland
So top tier gas is the best way?
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#3130380 - 09/20/13 07:34 AM Re: Keep carbon buildup out of the engine? [Re: horse123]
badtlc Offline


Registered: 06/08/06
Posts: 4979
Loc: KC
Originally Posted By: horse123
So top tier gas is the best way?


Quality fuel with high detergent levels is probably a good idea. Cheap fuels and regular use of cleaners can probably do as well.
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#3130690 - 09/20/13 01:14 PM Re: Keep carbon buildup out of the engine? [Re: horse123]
horse123 Offline


Registered: 09/06/13
Posts: 920
Loc: Portland
^ obvious spam account is obvious
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#3130698 - 09/20/13 01:20 PM Re: Keep carbon buildup out of the engine? [Re: horse123]
kimandsally Offline


Registered: 09/07/13
Posts: 16
Loc: United Kingdom
Originally Posted By: horse123
^ obvious spam account is obvious


Hi I have contacted the administrator of this site explaining what had happened, I DO NOT have to explain to you, either believe or not DO NOT accuse me of something I have never been EVER on ANY forum and I have been around the internet for 20 years using the same name, google me and then come back and apolagise.

PS
I love it you ask for help then accuse people who have spent their time trying to help of lying. Your best bet is to ignore what everyone says ans go wreck you car in you own way that way you will have no one else to blame.
One thing for sure I wouldn't type another letter to help you even if you were on fire!


Edited by kimandsally (09/20/13 01:31 PM)

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#3130720 - 09/20/13 01:51 PM Re: Keep carbon buildup out of the engine? [Re: horse123]
Trajan Offline


Registered: 07/16/05
Posts: 3730
Loc: SE PA
I think it's the non sponsor link that triggered the response.
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