Adjusting The Idle Screw On The Aac (rb20det)

[lows_13]

I cleaned out the AAC the other week and had the put the idle screw back in.

Will screwing it in decrease the idle or increase the idle?

Can it only be adjusted while the car is turned off or does the car need to be running while

its adjusted.

I tried to adjusted the idle screw while the car was running but the car would rev up and come back down to the

same rpm as prior.

Edited April 29, 2006 by lows_13

[Sheriff Wan]

Screwing it in will decrease the idle and visa versa

Also make sure the car is already warm when ur adjustin it because it will still idle high if its cold...

[lows_13]

I'll try screwing it in and see how we go from there.

[MonstaS4]

Adjusting it while the AAC is plugged in will do nothing because the AAC will compensate for the idle screw movement (Up to the min/max capabilities of the valve). i.e. idle speed is a closed loop system. The AAC will constantly adjust it's output to maintain a set idle speed e.g. 650rpm.

I can't remember the exact proceedure, but i think you need to disconnect the AAC plug, then adjust the screw till idle is around 500rpm, then plug it back in. Obviously the engine needs to be warm.