So, one of the most common symptoms associated with a problematic idle air control valve (IAC) is irregular idle speed. I take ABSOLUTELY ZERO CREDIT for the length of material you're about to read, however I have made a few comments in-text that you can see which I will highlight in green. I bought my Tahoe with 77,000 miles on it. You must get the timing just right Use a stop watch to help the precision of your timing. The pictures within this how-to are my contribution to aid in … Last night, I finally got the chance to move it. IDLE TUNING Foreword by Rinkrat456: This article is literally copied and pasted from Krambo's Silverado SS page. 2008 TrailBlazer SS AWD 3SS, Keystone Camaro SS Style Hood, LS1 Dual Fans, LS7 TB, 80lbs Injectors, Meth Injection, TVS2300 @14lbs, Innovators West 10% Overdrive 8-Rib Crank Pulley & T-Mac's 2.9" RIP 8-Rib Pulley, A.R.H. Irregular Idle Speed. Currently the Tech2 is the only way to do a crank relearn on an LS2 or later series. 1968 Camaro Ls2 6 speed. BigOgre. BTW: You'll know if you HAVE to do a Crank Relearn because it sets the Crank Relearn DTC every time you key on or start the engine. I pulled the TB (drive by wire) off and cleaned it really well and it bumped up to about 600-700 for a while but now it's back to 500. Note that these idle speeds are for the engine idling at normal operating temperature. To correct any accidental changes in throttle body calibration, use these procedures to recalibrate. Note: These procedures are a little tricky to do. The idle has always been very low @ 500 rpm. If the valve fails or has any issues, it can cause the idle speed to be thrown off. The alternative is for you to do the "Idle Relearn Procedure." Because, the (IAC); is programmed to regulate and maintain the engine idle speed at a constant rate. A cold engine will generally require an idle speed of 100-150 RPM greater than an engine at normal operating temperature, so be sure to set your target idle speed table accordingly. Stainless a Steel 1 7/8" W/Cats and a Full Custom Stainless Steel Dual Exhaust, Tune Time's Blower Cam It was even lower when I bought it, sometimes as low as 300 rpm. He is an HPTuners member on this site. LS2.Com Moderator Join Date Feb 2004 Location NE PA Posts 28,999 vCash 500. A Rough Idle or a SES can sometimes be caused by a change in the throttle body position sensor calibration. How do I get the idle speed resync proceedure for c6 corvette ls2 2005 - Answered by a verified Chevy Mechanic We use cookies to give you the best possible experience on our website. Here is the relearn procedure for our LS2 engines for throttle body: 1. By continuing to use this site you consent to the use of cookies on your device as described in our cookie policy unless you have disabled them. 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