richard-tx

I was talking to my local Audi dealer about carbon cleaning on the FSI engines and he said that many/most dealers use the BG products method to clean the carbon.

While the BG Induction System Cleaner (bg211) is readily available, the tools needed are a bit harder to get. I have found that the BG9206 induction tool is based on a Hago/Danfoss nozzle. The Hago nozzle is a 1 GPM 60 degree "B" type available from Ebay for about $6.00. The unit to inject the BG 211 into the nozzle is a OTC 7448A and is available from Amazon. Any adapters you need will have to be purchased. There is a seller on ebay selling the complete nozzle assembly for about $60 but you will have to still buy one more adapter to adapt it to the OTC 7448A.

So there you have it. Beats the $500+ BG price tag for their version of tools.

Good luck.

TSHong

Yes, most dealers use BG products and we use them at all our shops. The problem with FI and induction services are that it only works on port injection where the fuel is injected into the intake so the fuel/BG product goes through the valves. The problem with FSI engines are the fuel/BG mixture bypasses the valve and goes directly into the combustion chamber. You would clean the injector nozzle, the top of the piston, O2 sensors and the cats. The BG cleaner does not burn so anything after the combustion chamber is clean but nothing before, like the valves on an FSI engine.

I've talked to my BG rep on an FSI valve cleaning and they don't have any product or service that can do that right now.

aTOMic

I recently saw an S8's intake manifold disassembled for cleaning; it wasn't pretty. I cannot imagine any amount of spray-in solvent dissolving that gunk. This is the same as the FSI problem, right? I hadn't thought about it before, but even if the PCV system vents into the manifold, is there that much blow-by? Why wouldn't they position the crankcase discharge downstream from the flaps?

I recently invested in 4 cans of bg44k and saw no improvement in any of the 4 cars I used it in.

MP4.2+6.0

FWIW, I continue to think the 4.2 port injection manifold is total Rube Goldberg. My sense is the D3 S8 set up is something similar with the higher RPM switchover. Not sure about the FSI 4.2 design. Glad I didn't have it on the W12, and no logical real need for it on blown motors like by 2.0T based Q5 or the D4 S8 4.0T.

Having owned a 4.2 port (let alone an FSI) with the 2000 A6 4.2, I got to pay big bucks to replace it when it failed. Also found they were almost unobtainium on the used market (for my C5 4.2 motor at least), even from EBay Europe. Sign to me they were being replaced in large numbers over time. Having eventually taken mine apart after some critical pot metal castings broke, what I found is there are some critical "sealed" bearings at the throttle plate shafts. Trouble is, while they are sealed from the outside, the problem comes from within. What is going on is not so much the oil blow by--which would be a good thing for these bearings arguably--but rather the classic water vapor on start up coming through the PCV system. Among the reasons for aftermarket catch can popularity with some known direct injection foulers like the Gen 2 Mini's. But, this was on a port where the valves do get washed with injected fuel. But those flaps dont, yet the PCV system spits that emulsion goop forming water vapor into the intake on every cold start. That's where these weak link sub par bearings are, let alone the whole internal moving flap assemblies, external vacuum drive (at least on older 4.2's), external snapping plastic drive arms and all.

TSHong

My take is all the injector cleanings and BG 44K especially are maintenance items. They are meant to clean a little but mainly to keep it clean. If you have not done any cleaning for 100K miles and use one can of BG44K, it is not going to clean it in one cycle. I use a can of BG44K every 5K to keep everything as clean as possible.

richard-tx

https://vimeo.com/3989681

I would say that my dealer is right. The BG Induction cleaner does indeed work. It does clean the carbon from the intake valves on FSI engines.

richard-tx

BG44 isn't the same product as BG Induction System Cleaner. If you want to see the difference do a google search for "bg products MSDS" and compare the ingredients.

haggisuk

Having done a carbon clean on my own S8. don't for one second think this or any other treatments are going to make one bit of difference. save your money and send me half of it for the advice.

if your still unsure re read my reply

richard-tx

If the Audi dealers in my area use the BG stuff, then there must be some merit to it.

richard-tx

Here is the short version of the MSDS data for the products that the local Audi dealers use and recommends.

BG ISC Part #211
Name CAS # Percentage
1-methyl-2-pyrrolidone 872-50-4 30% - 60%
xylene 1330-20-7 15% - 40%
Ligroine 8032-32-4 5% - 10%
ETHYLBENZENE 100-41-4 1% - 5%
Isopropanol 67-63-0 1% - 5%

BG 44k Part #208
Distillates (petroleum), hydrotreated light 64742-47-8 15% - 40%
Mineral Spirits 8052-41-3 15% - 40%

The 44K msds sheet does not add up. 40%+40% < 100%. My guess is that someone screwed up when creating the MSDS.

While the classification "distillates, petroleum" is a catch all. the ingredient seems to be Stoddard Solvent per the text in the MSDS. Sure, it is a pricey mix of some common solvents, but Stoddard solvent is not available at Home Depot either.

Techron is a pretty good injector cleaner. That stuff does work. It just takes a tank or two for it to do it's job.

Here is the MSDS data for Techron

Distillates, hydrotreated light 64742-47-8 70% - 99 %wt/wt
01154100-5179P Trade secret 3% - 7 %wt/wt
01154100-5323P Trade Secret 0.1% - 1 %wt/wt

Here are links to the full MSDS.
http://www.kansasbg.com/complete_set_of_msds/211.pdf
http://www.kansasbg.com/complete_set_of_msds/208.pdf

Additional data can be obtained by talking to the Audi dealer techs in your area.

It also seems to be touted as a preventative maintenance item as well which is probably a good idea.