924Board.org

[d12-Matt]

My cold idle speed is around 200 RPM, and it often stalls when coming back down after I rev the engine. It runs fine once the engine has warmed up, though. I think the problem is the auxilary air regulator. I put it in the freezer for a couple hours, but it only opened up about 1/8th of the way. Should I replace this part, or should I look for something else first?

The car is a 1977 924 US version, if it makes any difference.

[924Kid]

ditto on d-12's question!!

[larso]

sounds like it's the problem

If giving the car gas helps, that's what the aux air valve does exactly.

[d12-Matt]

Yeah, giving it gas does fix it. At first I just adjusted the idle speed screw so it ran properly when cold, but then once the engine warmed up it would idle at like 1500 RPM.

[larso]

Exactly...definately sounds like the aux air valve. If you decide to buy a new one, let me know, i can get stuff wholesale.

I've got a used one too, I might keep it as a spare though are you looking for new or used do ya think?

[d12-Matt]

I was just about to call a porsche dealership to see how much it would cost there. I think I want a new one, as long as it's not too expensive. How much would it cost from the wholesaler?

Scratch that. I think I may have figured out how to adjust the one I currently have so it is open at the right temperature.

[ This Message was edited by: d12-Matt on 2001-11-11 14:32 ]

[924Kid]

I feel like a retart, but where the hell is the aux. air valve??

[d12-Matt]

I circled it on this photo. It's right below where those three big rubber hoses join together.

http://cq3.nofadz.com/auxairvalve.jpg

[SilverArrows]

I had no idea either 924kid! "Damnit Jim I'm a doctor not a mechanic."
By the way, d12-Matt has now adjusted/fixed the idle rpm.

[924Kid]

I thought that was it!! I always wimp out before I take anything apart on this car, needed to make sure. Thank you much guys.

[numbers]

So, how did you adjust it?

[d12-Matt]

There is a little bolt that can slide a bit when you loosen the nut. Moving it away from the center makes the hole open more. Also the bi-metallic strip is connected directly to the plastic electrical plug, so if that plastic part isn't flush with the metal then the hole probably won't open all the way. I just wrapped some thread in the groove to make it fit better. Plus, there was some grit inside that was preventing the piece from rotating freely, so I ground the rivets and took everything apart to clean it.