Idle problems, I know you know!!! Options

[BahnBrenner914]

So the ongoing project has been restarted after a 3 month break... no comment... and i fired the car up again and it starts and runs and isnt hunting much... the problem is that it idles at 1500 when i fire it up and then it slowly (really SLOWLY, like 30 seconds) climbs up to 2000 and i dont know if it will climb higher (i'll post a comment when i let it run longer tonight). I know 99% of you all have dealt with this, so help me go from (IMG:http://www.914world.com/bbs2/html/emoticons/headbang.gif) to (IMG:http://www.914world.com/bbs2/html/emoticons/driving-girl.gif)

[Rand]

Mine also idles faster after warmed up, and it's been a hair-pulling battle.

If the AAR valve is NOT working, it should fail closed, right? Meaning opposite behavior of what we are experiencing... It should open when cold, then close down as it warms up. It should feed extra air into the intake when it's cold, and therefor idle faster when cold and slow down as it warms up. So a bad AAR would mean when cold it might idle slower or need some gas pedal feathering until it warms up, but not idle faster when warm.

Fast idle usually means vacuum leak (or improperly connected vacuum hoses) or too-advanced timing. But I still haven't figured out how temperature plays into this yet, especially when it idles faster after warm.