You see that big hose that's between the air filter and the throttle that's just above your yellow drawing you could remove that and then step down with different size vacuum hoses and duct tape away to get a spray nozzle inside sticking it in the vacuum hose that will fit and like I said just duct tape the rest so that it doesn't leak and spray it through there and that'll clean it good

Hi Scotty,

I have a 2018 Mazda CX-5 with 6-Speed manual transmission, 37,000 KM, and a 2.0 L Skyactiv-G GDI engine, bought used at 30,000 KM almost a year ago.

I want to do maintenance on the carbon build up in my intake valves by using CRC GDI Intake Valve Cleaner through the brake booster tubes as seen in your earlier video from several years ago.

My question is which part of the brake booster vacuum tube connection should I use to spray in the cleaner? (points highlighted on attached indexed-image: A-hose inlet, B-metal pump inlet, C-hose inlet, D-intake valve/manifold inlet)

There is a metal machine in-between the two vacuum tubes leading from the brake booster to the intake valve/manifold. (object P on attached image)

From a mechanical breakdown video I saw on YouTube, I think it's some kind of pump to increase the vacuum pressure.

Or is a better option to spray the cleaner through the throttle body after removing MAF sensor and airbox as suggested on the can? (object T on attached image)

Please see images for reference:

Thank you, and all the best from the West coast here in Canada.

ScottyCX54life

Strange, the postimg links weren't working.

Adding again:

Is there a reason my question is still awaiting moderation?

This is the Scotty Kilmer video I used for reference:

https://www.youtube.com/watch?v=cP7D-5iQcNo

There is a large vacuum hose that runs by itself from the intake manifold directly to the vacuum booster on the brake master cylinder.  I can't tell anything from your photos.  Where did you get your photography training, the DMV?