T33 Rogue intake manifold cleanliness…?

[V6er]

Yello!

Our MY2023 is at about 27kmiles now… and it occured to me that this car might be under risk because of potential dirt accumulation on intake valves, head etc.

What are other people experience? What are recommendations?
TIA!

[VStar650CL]

It's not dirt so much as carbon. Your KR15 doesn't have both port and direct injection like a PR25, it only has DGI. So the intake valves are at great risk of carbon buildup, even if you drive the car hard. I usually decarbon for my good customers with every new air filter, it's easy to remember that way. I do it by way of a teaspoon of ATF (any kind) down a vacuum orifice while an assistant holds the engine at 3500~4000 RPM. Manifold vacuum isn't particularly easy to find on a KR15, I use the hose feeding the Purge Volume Valve on the driver's side of the manifold plenum.

[V6er]

yeah, carbon would be better term. sorry - my English sometimes is creepy

big thanks for recipe! will do it soon (will check with my borescope too - may be make before/after pictures)