Hi ,

I am still sorting some issues on my 1979 930. I need to get it smogged this weekend but I have a high idle issue as the AAV that is not functioning properly. There isnt any power at the plug when cold and testing the pin-outs, they are both grounded. Does anyone know where the AAV gets power (thermal time switch?) or if it is always powered to 12v even if the engine is warm? I can get the AAV to close if the car has been sitting, since the AAV heats up from the engine being hot but opens again when the car is driven and air circulates inside the engine compartment cooling the AAV a bit.

thanks for any help,
Oskar

I will try this in the 911 forum as well as I think they should be the same.

 

The AAV has no connection to the thermal time switch.

It at least gets power all the time the engine is running, not sure about when only the ignition is on.

Correct me if I am wrong guys.

 

The CIS components "daisy chain" starting with the Cold Start Injector. Once the CSI is activated all the rest get power. The loop bypasses the CSI after startup and the other CIS components remain innervated.
You could easily have a short in the lead that connects your AAR. I believe if you turn your ignition switch to the "on" position and jump your fuel pumps you should be able to get an electrical reading from the CIS devices.
You can also bench test your AAR as well.