I have 2019 Honda Pilot with 10,000 miles and thinking of doing an intake valve cleaning using CRC cleaner. Should I spray the cleaner through the air intake or the brake booster line? Worried spraying through air intake might affect the MAF or or other sensors, but not sure if spraying through the brake booster valve will let the cleaner get to the far 3 cylinders.
Spray it directly into the throttle body. I've used this spray before and it actually works pretty good. But I decided to spray directly into the intake past the MAF sensor. This was not a good idea because on turbocharged engines, there are MAP sensors past the MAF sensor (can only says to spray past MAF and does not mention to watch for other sensors). So in my case, I ended up coating all my MAP sensors on the intake piping causing a check engine light to come on. I just had to clean the sensors after...not a big deal.
Of course walnut blasting is the best carbon cleaning method, but this spray does help noticeably.
You need ZERO cleaners. Don't add or do anything. These aren't german GDIs.
Gasoline itself is a solvent.
Buy a set of oxygen sensors with that snake oil.
CRC is good to clean TB when engine NOT running. Spraying it in intake won't harm anything (don't spray on maf) when running, but it won't really clean anything enough to make any difference especially valves and might wash some gunk from intake into cylinder... hence I don't recommend.
