Aux Air Valve Question
 

Can L-Jet Aux Air Valve be powered all the time or does it need to be switched off after warm up.
Thanks-

it is supplied with 12v all the time ,
once 12v is removed then the valve inside will move to its cold open position

Kinda dumb isnt it? Or does it stop getting 12v when the thermotime switch opens?
My WUR (K-jet) has two windings on its bi-metallic strip, and I think one of them isolates 12V when the strip is fully heated by engine heat. The same could apply to the AAV...
jp 83 Euro S AT 54k

Stan,
I see a white square with an exclamation point - is that a Flash video, or what?

My AAV get very hot to touch after 10 min. Maybe I have it wired backwards.

2 wire or 3 wire?

2 wire

The temp time switch turns OFF the signal to the heating element inside the aux. air valve. By that time, the aux. air valve should be thoroughly heat soaked from the engine heat.

In case you don't know how it works. there is a bi-metalic strip inside it. The bimetalic strip is resting against a "wheel". The wheel has a little tit on it's outside edge so that as the bi-metalic strip heats up and bends, it rotates the wheel. The wheel has a very irregularly shaped hole in it that allows air to bypass during warm up to bring the idle speed up. The cold position of the wheel is fully open. The hot position of the wheel is fully closed. The bi-metalic strip has a heating element wrapped around it. The temp time switch sends a 12v signal to the heating element to begin it's warm up. The engine heat that wicks into the aux. air valve is what keeps the wheel in the "closed" position. If you want to see it for yourself, just drill out the rivets holding the whole thing together. You can re-assemble using small bolts.

Mine played up a while ago and didnt open enough to prevent occasional stalling during warm up. I removed, drilled out the rivets, and managed to get it to open enough for ~1100rpm idle when really cold - couple of tests in the freezer, bending the spring anchor point, re-seal with m6 bolts.

If yours gets very hot quickly, sounds like the heater wires may have shorted?

jp 83 Euro S AT 54k.

Curious? - L-Jet Aux Air Valve, Under the spider connected by 2 rubber hoses? Is this what you all are talking about?

Like the pic in the first post - yes. Disappeared in LH-jet, as that has an idle stabilizer valve.
jp 83 Euro S AT 54k

My 85 LH Euro still has an Aux. air valve. I think they went away with the 32v engines so US 85-85 & ROW 87.

The talk of 12v had me wondering. No 12v connection like that as I remember on mine.

PET shows 2 caps instead of the rubber hoses that I bought and installed when I removed my aux. air valve.

So looking at the wire diagram looks like AAV (Start Valve) gets constant 12v and the ground is switched off when the thermo reaches temperature. Right?

The AAR is actually listed as the "Supplementary AIR valve" in the wiring docs for my 81 Euro car (not "start valve"), and gets constant 12v when the fuel pump relay is activated. Start Valve refers to the cold start fuel injector.