Sep 13, 2009 · The ISC does this as a stepper motor under control of the ECU, which can finetune the idle rpm. The Fast Idle Air Valve does this as a very coarse adjustment based on …

Aug 20, 2011 · OP, if your car has boost leaks, misadjusted TPS, misadjusted ISC, misadjusted base ignition timing, dead o2, over heating, forget it dude. Make sure all this stuff is functioning …

Nov 16, 2014 · I'll test the ISC tomorrow to confirm it's bad, but suffice it to say something bad happened and completely fried the ISC driver. The ECU seemed fine up until recently, when I …

Sep 5, 2013 · I have 280* cams, and with the ISC set to about 30 steps at warm idle, I can reach in through the window and start the car even at 15-20*F outside. Throwing the deadtime and …

Dec 24, 2012 · My ISC was only reading 47ohms on one coil, other three were in spec at 30ohms. That small increase in coil resistance knocked out part of the ISC control circuit.

Feb 23, 2009 · It sounds to me like your ISC (Idle speed controller) isn't functioning. It should hold 800 rpm no matter what. Setting the BISS ISC Testing You should also open the ECU and …

Jul 9, 2003 · I replaced the ISC unit with one I got from Gabor, replaced the throttle body shaft seals (which were basically not there anymore), re-adjusted the Throttle Position Sensor, and …

Dec 6, 2002 · There's a big o-ring where the ISC mates into the throttle body, be careful that it doesn't fall out.Don't overlook a pressure test on the intake tract. There's a million places …

May 20, 2016 · Seems the ISC driver kursploded from a short, which explains why it was unplugged. The OEM replacement seems to be big money. Has anyone had any luck with the …

Aug 31, 2013 · As I work through many, many issues with 1587, I have found that I have a blown ISC driver (IC105). According to ECM Tuning, the drivers do the following functions: IC104 …