AAV (Auxiliary Air Valve) issues when cold?

[eulogious]

So the other day I started my car to let it warm up with my remote start. I went about my usual routine for about 10 more min, and then went down to my car to discover it off. I thought that this was weird, so I started it back up to see what would happen. It started fine, but then the idle climbed to about 2200 and stayed there. So I tapped the gas to see if it would drop the RPM's. This is where it gets a little weird. When I tapped the gas, the idle would drop down to about 1100 RPM's and then immediately climb back up to 2200 RPM's. It did this consistently for about 5 min while I waited to see what would happen. After 5 min passed and nothing changed, I drove to work because I was going to be late. On the way to work, the car acted fine, and when I got to work, it was idling just fine. It was not done this since, that was two days ago. It was also super cold, around 10 degrees when I tried to start the car. I have started it since then in the same weather on a different morning, and I didn't have a problem. I have also started my car several other times after having it sit for a few hours in the cold, and have not had a problem. It seems that this was a one time thing.

 

So my question are these, would the AAV cause this symptom? Where can I find an AAV if it is the problem, rockauto doesn't list them? Should I even be worried about it? The car is a 1990 loyale turbo wagon. My FSM doesn't really say too much about the AAV, so any help would be greatly appreciated.

 

Another question along the same lines... Where is the Fast Idle adjust screw? According to the FSM it should be right under the Fast Idle Solenoid, but when I go out and look at my car, I find the Fast Idle Solenoid, but where I think the fast idle adjust screw should be, there is a bolt there. Yes a bolt with no slot for a screw driver. It's a normal bolt sticking out... So should I remove the bolt and see what's behind it, or just leave it be? I want to adjust the the fast idle speed because it seems really high, when the AC kicks in, the idle jumps to about 1200 RPM's. My FSM says that the idle should be about 850 or so, where the normal idle should be around 800, and my idle is about 800, so according to the FSM, it's high, so I would like to adjust it down to the specs, so any help with this would also be much appreciated.

[Gloyale]

2200 fast idle on a very cold day is pretty normal. It may have persisted longer on that day because of some moisture frozen and stuck in the valve.

[eulogious]

That's good. Is the AAV like the IAC? Can I clean it to see if that helps, and if I can clean it, is it the same procedure as cleaning the IAC? What should I look out for to see if it's on its way out the door? I have only had the car for a few months, so when something new comes around I haven't seen before, I like to try to find out if it a problem or a "normal" thing, at least "normal" for a car with 200,000 miles on it

 

What about the high idle adjustment? I am just curious if the bolt is standard procedure. When it warms up a little outside, I might go out and see what happens when the bolt is removed and see what going on. Thanks all!

[eulogious]

Ok, so I figured I would update this thread finally after fixing the problem. It was the AAV. How I tested it was pinching the hose coming from the AAV and going to the manifold I believe. I could be wrong on where the tube goes, but if I remember correctly there is only one tube coming from the AAV, so you can't really miss it. I took a pair of pliers and pinched that hose and the idle dropped, so I knew it was the AAV. I then found one from Turbone (thanks!), installed it and it has been fine ever since! It's great not having a car idle at 1800 RPM

[Turbone]

Awesome, glad it worked.