Hi I've done a search and i can't find what i'm looking for so maybe someone can help me. I own an auto VL N/A. Recently i had a 2.5inch exhaust put in and had the center muffler removed. Now my car idles at 1000rpm compared to when it used to idle at 850rpm. What is the easiest way to lower the idle? Thanks

you can adjust the idle speed by turning the adjusting screw on the AAC valve (screw facing the firewall on the rear most part of the intake plenum)

Which way raises/lowers the idle? gregories book doesnt mention ..

I adjusted my idle from the ecu the other day, try that.

That adjusts the base idle, the actual physical characteristics that affect idle (air flow, in this case I believe) are adjusted by a screw on the back of the plennum. But I'm not sure which way adjusts this screw.

To adjust the idle you have to disconnect the Throttle Position Sensor and the AAC valve, then adjust the screw on the back of the plenum to achieve 650rpm, then plug all the sensors back on and all should be sweet at around 750rpm. To answer your question though, clockwise will lower the idle, anti-clockwise will raise it. If you think about it as you screw the screw in(clockwise) further it lets less air bypass therefore decreasing your idle speed. Mick

yeh thanks for that. It now idles at 800rpm which is what it used to idle at before the exhaust.

what speed should a vl idle at. mine idles at about 1100 in park and about 600 in drive with foot on the brake.

I think the Vl's are supposed to idle faily high like 750-800rpm.

hmm, my auto seems to always idle at 600rpm nice and smooth too .. doesnt drop when it goes into gear either.