Cold start idle issue

[gumba]

On the 930, when the motor catches on startup , I need to depress the throttle to keep it running. Also won't idle when cold unless I keep my foot on the gas. The control pressures are within spec. I've had this problem as long as I can remember.

On the 930 bus with pretty much the same setup, it starts and idles with no issues.
Any suggestions as what to look for?

[gsxrken]

Do you still have a auxiliary air valve? Just this year mine exhibited the same symptoms and upon disassembly I found that a solder joint had broke, thus the 12v was not making it to the heating element.
When working properly, you’ll get more air through the AAV and thus a high idle, for about 90 seconds or so before the heating element expands and closes off the air pathway via a sliding valve inside it.

[gumba]

Yes, still there. I'll take it apart and check it out.
thanks.

[gumba]

I have 12v to the plug.
The internal wires aren’t broken. When I put 12v to the pins I get 12v inside the housing.
Is the metal plate suppose to move when 12v is applied opening up the flapper?

[gumba]

In the cold position, the flapper is left of center. Not being over to the right far enough to keep the valve open. When I apply 12v, it does move to the left as it heats up.

[gumba]

Fixed. I added a small spacer onto the lever arm.

[gsxrken]

That’ll do it too. Glad it worked! The other way is a lot like tweaking the WUR -

Originally Posted by JFairman

The bimetalic spring inside the AAR is held in position just like the bimetalic spring inside the control pressure regulator/WUR.
The static position of that spring is adjusted the same way in both of them. The steel interference pin they are mounted on is tapped into postion with a small hammer and brass drift punch or squeezed into place with a C-clamp and small socket used as a drift.
I've never adjusted my AAR because mine works perfectly but thats how it is done and you'll see the round steel pin if you look for it.

[minhlongmotor]

Hope you have overcome it. If not you can contact me.