I pretty sure I know thew shop and the owner. I have been around MINI's since 2002. I own 2 MCS 1st and 2nd Gen and both modified. The MINI specifically 2nd Gen MCS are nothing like the Skyactiv engine and cannot really be compared to them for servicing. I am surprised your MINI at only 45 had enough carbon build up that it caused concerns or performance notice.

As for prevention,. Unfortunately like all DI engines there is little you can do. All Mazda gasoline Skyactiv engines are DI. Your MINI is easy! I run my own little de-carbonize, preventative system on my Mazda but it meant doing a slight ECU adjustment to compensate for the change in MAS reading vs fluid going into he intake. While I am on the fence about catch cans and most are a HYP or because their universal nature don't work as advertised. I ran 3, 1 on the breather side and 2 on the POCV side and oil vapors still got into the intake system.
This is just the livable things with all DI9direct injection) engine that are the most commonly used on most platforms currently.

I DO NOT recommend to introduce any fluid on the intake side of as Gas Mazda Skyactiv engine. This will surely at minimum generate a DTC. The ECU measures via several sensors the air mas to calculate the total gas and fuel volume entering the combustion chamber and adjust the cam and ignition timing. The Mazda intake is an air intake only and cannot measure fluids which will reduce the calculated air mass.

 

This is my carbon prevention and inductive cleaner system specifically for my Mazda Skyactiv 2.5 engine r. Keep in mind I also use an ECU Performance calibration program, *Versa Tuner to make complete ECU adjustments as well DATA log events and have on the fly calibration files i can upload in the ECU anytime.
I think IMHO that my little system is much cleaner than any service type as well has the added benefits of increased power and MPG with some special fluid formulas.
VersaTuner

 

[QUOTE=Callisto;223138]I pretty sure I know thew shop and the owner. I have been around MINI's since 2002. I own 2 MCS 1st and 2nd Gen and both modified. The MINI specifically 2nd Gen MCS are nothing like the Skyactiv engine and cannot really be compared to them for servicing. I am surprised your MINI at only 45 had enough carbon build up that it caused concerns or performance notice.]

Yeah it had a ton of carbon and made a noticeable difference. It was Detroit Tuned that did the work. They also did their "cryogenic frozen" timing chain at the same time (was just starting to make noise). They were the only place I let work on it other than myself. My N14 was a dealer installed John Cooper Works package. I did an intake muffler delete and a noise generator delete (couple hoses), but other than that it was stock. Really enjoyed the car, just drove it on the nice days in the summer. Had it for nine years. Did Mini on the Mack in 2015.

 

I was at the opening event at Laguna Seca (more then a spectator) when the very first JCW MINIs were released to their new owners.
Our 09 MCS is a Dailey driver. Sorta .



The 02 MCS is not even close to stock.
peak of 02 MCS interior

 

So what would be the best ways to try and keep the intake valves clean without taking the engine apart? High quality fuel and a bottle of fuel cleaner like Chevron Techron every oil change? I do tend to rev my engine out on the highway as well so that should be somewhat helpful with carbon deposits.

 

https://vpracingfuels.com/product/sp...-fluid/?c=367&
Through the throttle body; after the MAF sensor. I've been spraying since getting off warranty @ 36k. When the supercharger was installed the valves were _clean_ @ 68k. Now at 78k and still purring. Versatuned@home.

 

There really is nothing sorry.
And RPM has zero effect on the carbon because it is a DI engine.

PM sent

 

This will not work on a MAZDA skyactiv engine. ( SEE INTAKE MANIFOLD DESIGN ) And can and often does cause problems.

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sluggo48313
I am confused, did you have a N/A MINI and had the supercharger (JCW) installed? Also you have a VersaTune on your MINI?
The word "spraying" and used in the same conversion you posted the means you are running a Water/Meth system? So I presume that you modified it to operation both auto as designed and manual to use as a cleaning system for the inductive system? Those system are designed for WOT or psi (supercharger boost pressure) activated. So unless you did a manual operation they do little for carbon concerns if platform used is primarily a DD?

 

I pared down your comments to the only accurate portion.
I have to run out to the garage and tell the CX-5 what it has been doing for the last 35k miles can't be done.

 

sluggo48313 Maybe I am miss-reading your information between your MINI and your MAZDA.???

However if it is the MAZDA and you are using the MAF port this will eventually bite you in the ****. Maybe if you must do this procedure remove the IAT sensor and go there.
If not have a spare IAT on hand in the future?

As for my comment about the intake on your Skyactive engine try scoping your intake. You may be in for a surprise what you find?