Join Date: May 2004
location: Morganville, NJ
Thanked 22 Times in 18 Posts
Before adjusting anything, make sure the throttle body bore and plate are clean.
I tend not to like messing with the IAC, but in your case you might have to.
The small port just to the outside of the plate is the feed passage for air for the IAC. Spray carb cleaner in there, liberally, and then if you have compressed air, immediately blow air through that port. You don't want the gunk collecting in there, it will make the valve stick, causing other issues.
Just cleaning any gunk in there may make the idle come up to normal.
This is on the '99 in your sig, correct?
Sapphire blue '04 V6 6 speed w/ full HFP, comptech ss, momo shadow, TL-S 27.2h/20 bars, intake spacer, retro chrome MH1 HIR2 highs, hella DE fogs, EBC Ultimax, subwoofer/amp, infinity rears, HD Radio, aux adapter, navi conversion.
Vermilion 1999 SVT F150 Lightning, Sylvania/Visteon Xenarc HID headlamps, '01 L turn/marker lamps, PIAA fogs, '01 up Bilstein shocks, all Pioneer speakers, Clarion subwoofer. All Redline fluids.
Silverstone 2003 Honda S2000, bone stock