Unplugged device in my engine

[MarcoPau]

Hi, found out that the device in the picture is unplugged. The wire going from that connector (marked AMR) is loose in the engine bay. I don't even know what that device is, honestly. Should I do something or leave it like that?

Thanks a lot!

[kodioneill]

That is the auxiliary air valve that allows for more air into the intake when cold to help the engine idle when cold. Almost like a measured induction leak. The connector is a pair of wires that provide power to heat up a bimetallic device that opens when cold and closes when hot to close off the valve when operating temperature is reached.

http://www.bing.com/images/search?q=auxiliary+air+valve&id=03150610FCEC854D7B1931184EF820D6B8D1D0A1&FORM=IQFRBA

[MarcoPau]

Thank you kodioneill. Can you help me find this one device to plug it in? I have been looking around the engine but can't find the socket...

[boyt911sc]

Originally Posted by kodioneill

That is the auxiliary air valve that allows for more air into the intake when cold to help the engine idle when cold. Almost like a measured induction leak. The connector is a pair of wires that provide power to heat up a bimetallic device that opens when cold and closes when hot to close off the valve when operating temperature is reached.

auxiliary air valve - Bing Images

Marco,

We commonly call this CIS component as AAR (auxiliary air regulator) but some technical manuals refer to it as auxiliary air valve or supplementary air valve. So having shown the picture of the CIS component in question could reduce the confusion in naming this part.

I could not say the other poster was wrong because he was not!!!! It is just a name and you'll get used to it calling it AAR instead of AAV. There is a different AAV device located near your AAR. Follow me?

Tony

[Scott R]

Locate the plug for the WUR between the intake runners on the drivers side. The WUR and the AAR draw +12 from the same source. You will likely find that the harness is broken right under the lowest part of the plastic airbox.

[MarcoPau]

Thanks a lot Tony for the explanation. I'm new to this car and it is very important for me to understand what we are talking about.

Scott: are you saying the AAR is to be connected to the WUR? I already found the other side of the wire and it had been unplugged on purpose (the connector is wrapped with insulating tape). If the WUR is what I am showing here, it already has a wire plugged into it. Should I assume they drew a wire from somewhere else and excluded the AAR for some reason? The wire is coming from a big sheath behind the fan, which the fan on the upper left side of the engine bay takes power from. If things are like so, I guess I could just unplug the actual connector from the WUR and use the one coming from the AAR... right?

I read somebody used to choke the AAR in order to get a faster dropping of the rpm of the engine when taking the foot off the throttle. Maybe that's what they wanted to do...

[boyt911sc]

Originally Posted by MarcoPau

Thanks a lot Tony for the explanation. I'm new to this car and it is very important for me to understand what we are talking about.

Scott: are you saying the AAR is to be connected to the WUR? I already found the other side of the wire and it had been unplugged on purpose (the connector is wrapped with insulating tape). If the WUR is what I am showing here, it already has a wire plugged into it. Should I assume they drew a wire from somewhere else and excluded the AAR for some reason? The wire is coming from a big sheath behind the fan, which the fan on the upper left side of the engine bay takes power from. If things are like so, I guess I could just unplug the actual connector from the WUR and use the one coming from the AAR... right?

I read somebody used to choke the AAR in order to get a faster dropping of the rpm of the engine when taking the foot off the throttle. Maybe that's what they wanted to do...

Marco,

The later SC's have a deceleration valve (with nipple) that could be easily mistaken as the AAV ( auxiliary air valve) like this (picture taken from MCA's library):



The FP, WUR, AAR, and TTV (thermotime valve for early SC's) are all connected @ terminal #30 (FP relay socket). In summary, all these CIS component get energized basically at the same time when terminal #30 gets power from the FP relay switching. And the switching will occur only after the AFS (air flow switch) loses ground contact. Getting confuse? Hope not. Find a wiring diagram for late SC's preferably in color to make the reading and tracing of the circuits convenient and easy.

Tony

[Jeff_Ragsdale]

Where does the hose that attaches to the nipple of the Decel valve go? I have been chasing a suspected vacuum leak and just noticed the nipple of the Decel does not have a disconnected hose anywhere in sight. Is that a possibility for my suspected vacuum leak?

[Paulporsche]

For SC engines: