High idle

[JGoatley]

81 euro 5 speed. Idle has been perfect. Upon startup, it would jump up to about 2000 or so for a minute or two then settle in at about 900. Been that way since I put the timing belt back on about two years ago. I drove it today - temp was about 25 to 30 degrees. After engine fully warm, car still wanted to idle at about 1500. Would take about 1 minute or so and then it drop to 1000. Had to be at a really long light for the idle to drop down. I noticed the same thing thanksgiving when I drove it below 30 degrees. Very rare for us to be this cold so I haven't had many opportunities to notice this. Last week, temp in the 50's - idle was at 900 as it should have been. Is this an air aux valve peculiarity? Not understanding how outside temp is affecting it. I would think this would be determined by the engine temp. Any ideas?

[syoo8]

Idle stabilizer valve- when was it last changed?

[MPDano]

Originally Posted by syoo8

Idle stabilizer valve- when was it last changed?

Idle stabilizer valve? Where is that? 81 Euro is a CIS. Air Aux Valve (AAV) relies on temp changes. There is actually a very good video on youtube on how it operates.

[JGoatley]

Thanks for the quick responses. Dano- i watched the video. Am I correct in thinking that while my car is moving in this frigid air the AAV is staying cold so it is raising idle. It takes a minute or two sitting still for the engine bay to warm up up enough to persuade the valve to close.

[syoo8]

My bad. The ISV is only for 85+

Both of my sharks are 32V so I didn't know this.

[MPDano]

Originally Posted by JGoatley

Thanks for the quick responses. Dano- i watched the video. Am I correct in thinking that while my car is moving in this frigid air the AAV is staying cold so it is raising idle. It takes a minute or two sitting still for the engine bay to warm up up enough to persuade the valve to close.

Valve inside is fully open when cold. Fully closed when warm. It sounds like your not getting 12v to the AAV as there is a bi-metalic strip inside that rotates this wheel valve closed. Heat from the engine will eventually keep it closed on it's own. I believe there is a temp time switch which will shut the 12v off when the engine is warm. To me, seems like your only using engine temp to close the valve.

Pretty sure this is how it works, someone correct me if I am wrong.