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Carbon Buildup 101

GroceryGTIer

Go Kart Champion
Does anyone lube the blue seals before putting the manifold back on? With what if so?

Also, does everyone put their manifold bracket back on? Thing sucks
 

Ronnie_B

Ready to race!
Does anyone lube the blue seals before putting the manifold back on? With what if so?

Also, does everyone put their manifold bracket back on? Thing sucks
Lube the blue injector seals with silicone free motor oil. Obviously do not lube the white Teflon seals. The manifold bracket is the trickiest part of the job. I installed it after the manifold was in place, given that seating the injectors is the highest priority. It's much easier with the TB removed.
 

GroceryGTIer

Go Kart Champion
Lube the blue injector seals with silicone free motor oil. Obviously do not lube the white Teflon seals. The manifold bracket is the trickiest part of the job. I installed it after the manifold was in place, given that seating the injectors is the highest priority. It's much easier with the TB removed.
I put the white (teflon) seals on by hand and used a zip tie to tighten them, but I wasn't sure about which lubricant to use on the blue seals, obviously I don't want an issue with them.
 

mikedesamero83

New member
I was throwing a cylinder 3 misfire. I decided to try the cheaper fix: CRC GDI Intake Valve Cleaner. I have 80k miles.

1 month later: check engine light hasn't come back on, acceleration seems smoother, no rough idle.

Good fix for the price. I might spray another bottle after another 1K miles.
 

GroceryGTIer

Go Kart Champion
I was throwing a cylinder 3 misfire. I decided to try the cheaper fix: CRC GDI Intake Valve Cleaner. I have 80k miles.

1 month later: check engine light hasn't come back on, acceleration seems smoother, no rough idle.

Good fix for the price. I might spray another bottle after another 1K miles.
It's very good for dissolving carbon, but to do really breaking down, 30 minutes of it sitting on a valve will do wonders, simply sweeping passed it won't do a whole lot. After cleaning mine manually the first time, I literally let the valves sit over 24 hours in b12 chemtool and even then, they had to be scrapped and cleaned with effort.
 

wmssbr10

Passed Driver's Ed
I was throwing a cylinder 3 misfire. I decided to try the cheaper fix: CRC GDI Intake Valve Cleaner. I have 80k miles.

1 month later: check engine light hasn't come back on, acceleration seems smoother, no rough idle.

Good fix for the price. I might spray another bottle after another 1K miles.
I had 80k no CEL's and no rough idle but was going K04 so did cleaning and tensioner. The valves were caked and gummy with carbon. A lot of 2+2 gum cutter and scraping was necessary to clean them up.
 

GroceryGTIer

Go Kart Champion
I had 80k no CEL's and no rough idle but was going K04 so did cleaning and tensioner. The valves were caked and gummy with carbon. A lot of 2+2 gum cutter and scraping was necessary to clean them up.
If you use that GDI cleaner and let it soak, you hardly have to scrape it, same with b12 chemtool
 
Last edited:

ben_m

Ready to race!
VW Huntington gave me a solid deal, I needed my intake manifold replaced and since they were already tearing into the car it only cost me 1.5hours in labor for the cleaning :) Not sure how bad it was, car was at 63k mostly local driving.
 

bruxwillix1

New member
apologize if this was already mentioned.. long thread.
but is it the general consensus that an induction service at the dealership does nothing? not even a good preventive measure? "pressurized atomizing" they're calling it. basically hooking up to a vacuum line with something similar to but i hope more hi tech then this
https://www.ecstuning.com/b-sur-and-r-parts/intake-system-cleaner-canister/srrfic903~srr/

thinking of getting 1 of those canisters and filling it with some CRC valve cleaner but did want to start with an induction service at ther dealer. unless my fellow enthusiasts advise otherwise....

Sent from my SM-G960U using Tapatalk
 

realcyberbob

Go Kart Champion
apologize if this was already mentioned.. long thread.
but is it the general consensus that an induction service at the dealership does nothing? not even a good preventive measure? "pressurized atomizing" they're calling it. basically hooking up to a vacuum line with something similar to but i hope more hi tech then this
https://www.ecstuning.com/b-sur-and-r-parts/intake-system-cleaner-canister/srrfic903~srr/

thinking of getting 1 of those canisters and filling it with some CRC valve cleaner but did want to start with an induction service at ther dealer. unless my fellow enthusiasts advise otherwise....

Sent from my SM-G960U using Tapatalk
It may do something to keep valves clean once they've been cleaned, but to actually clean them you have to scrape or walnut blast.
 

tmiw

Go Kart Champion
I'm occasionally getting shaking at idle right on startup now (and misfire codes in VCDS). I guess it's time to look into how much a carbon cleaning will be.

BTW, I'm close to 107K miles on my 2012 and have yet to do a carbon cleaning.
 

GolNat

Ready to race!
Good to know!

When I uploaded them I was like oh man that looks horrible, but after going back and looking at other peoples it is really not that bad.
 

zrickety

The Fixer
168k...never carbon cleaned.
Just replaced the manifold, mine look worse than that but still thought I could wait. Car still runs strong.
 

theclutch

Ready to race!
Just took a look at mine today @ 48k miles. Was going to do a cleaning when I got closer to 60k.





I assume you used a borescope for this. Can you put pics as to which screw you removed and stuck the scope into in order to take the pics? Thanks in advance!
 

theclutch

Ready to race!
I finally got around to walnut blasting mine this past weekend. I have 67k miles and had been experiencing random misfires. The job took me about 10hrs, but I took my time and also replaced a few coolant hoses while I had the IM off. I did end up pulling the throttle body, but installed it on the IM before reinstall.

I went with a walnut blaster from Harbor Freight, connected to a BMW blaster wand with a modified shopvac attachment. Worked like a charm....


Blast wand setup I used.

Thanks for posting. Do you have links to the tools you used? Thanks in advance!
 
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