What is the little hole with a seal round it under the plenum? (pic inside)

[xr2racer]

This. Connects to a hole in the bottom of the plenum, can't work out what it's for?

 

[sideways danny]

well, there's a small breather hole (giving positive crankcase ventilation). But the large hole in the plenum is really just an old design feature of the 172, where it provided a vacuum to the carbon canister.

 

[xr2racer]

Ah. Danny is there anything about clios you don't actually know?!?

So has the vacuum for the cc moved somewhere else on the 182? The vacuum line just under and to the left of the tb is for the acoustic valve isn't it?

 

[sideways danny]

I'm just a bit sad tbh. lol

yeah, the carbon canister vac now goes just infront of the coil, and clips straight into the back of the plenum, next to the servo vacuum pipe. As you say, the small vac pipe by the throttle goes to the accoustic valve