when starting cold idle goes imediatly to 1,100 rpm then tries to die and after two or 4 minutes it achieves a good warm idle.
i inspected the electric air valve and it was gummed up.
i cleaned then connected to a 12 volt source and it opened.
i noticed that it is either open or shut nothing between.

electric air valve part number 928-606-21501. 2 pin connection


so i checked the to leads red/black and brown and i have no juice at the connectors with ignition on .

the car is still cold is this a heat issue to read volts or should i check relay XVIII.

thank you for any idea's

 

I BELIEVE IT USES A THERMOSTAT IN THE UNIT:
It closes as it heats up so if you have no voltage it could be stuck in one position.

 

The 16V LH2² cold start/auxiliary valve is on the same circuit as the the fuel pump (relay XX, fuse 42), so it won't be powered unless the engine is running.


The LH only closes the fuel pump relay when it gets a rpm signal from the EZF. It opens it if you hit the rev limit.


I only just now noticed that injector 12V+ is powered by the same ciruit (unfused). That's why the rev limiter is so fast...duh!


On 32V engines, the idle speed regulator (IAC/ICV), and oxygen sensor heater is also switched by the fuel pump relay.

 

with 12 volts it opens so it should get 12 volts from fuel pump relay until the cold idle cycle is complete and valve will close. correct? or after a certain rpm is reached ?

 

It gets 12V as long as the engine is running.

The 12V powers a small heater which, along with heat from the coolant, heats a bi-metal strip which closes the valve. The time is takes to close is determined only by how hot the engine is. It's not controlled by the LH.

 

i just checked the connection and found the following issue.
12 volts only comes in when ac switch is on .
in a 85 euro is this piece used only for idle help during ac operation. also the valve has only two positions open and closed and reacts quickly to 12 votls so i doubt there is any heating element as on the auxulary air valve.
so what tells the car to go to high idle when cold?

 

You've been talking about #8.

You want #9, under the plenum, on the passenger side head.

 

Maybe someone can answer this for me... is #8 the electronic air valve (in my case part # 928.606.215.01) necessary? I'm trying to get rid of everything I don't need on my track car and this little bugger is something I'm just that familar with.

 

You don't need the part labelled 8 if you aren't using A/C. Just block off both hoses or put caps over the ports on the plenum and throttle body
Its used to prevent engine stalling/low idle speed when the air conditioning compressor is active.