What is this?

[carpaltunnel]

Just bought a 2015 FJ-09. It had 28k miles, and hadn't had a valve check done yet, so I immediately did a valve check (tight exhaust valves!) and adjustment, coolant swap, new plugs, throttle body sync, new a/f, rode it for 20 miles, and finished it all off with an oil/filter change. The only problem is that I could not remember where this rubber part goes? Everything went together great without it... what is this?

[skipperT]

I think that’s the rubber bootie for the AIS valve which lives just above the cyl head cover. 

-Skip

[piotrek]

...what @skipperT said. #3 on diagram below.

[carpaltunnel]

Ah. Makes sense. Seems like the ais valve won't be going anywhere. It weighs very little and is suspended between 3 hoses. I'll put it back on next time I have a reason to take the tank off.

 

Thanks guys!

[BBB]

You can also put it back on if you take the top two bolts out and tilt the top of the radiator forward, as the rubber bit docks onto a “spike” on the back of the radiator. But as you say, the AIS is going nowhere so no rush.