There is a nose switch on the ISC pushrod that senses when the throttle cam is at closed throttle, therefore the ECM can control idle. Check this pushrod, is it fully extended? If it is fully extended, lift the throttle slightly off this pushrod, and press on the rod. If it tries(or does) fully retract, the isc is at least functional. If it does not, there may be a fault with the ISC motor. The throttle shaft could also be binding, if this was the case, there may be a gap between the ISC pintle and the throttle cam. Press the throttle cam against the pintle, and hold the pressure to see if the ISC tries to control. If it is binding in the throttle body, you would have to replace it, and more than likely you would be locating a used one. Sometimes you can manipulate the return spring to increase the return pressure, this will also cause more force on the pedal to accelerate. If it is 'sailing on' after an acceleration event, then you may just need to have the minimum air rate, and tps adjusted, along with an idle learn.
Friday, September 9th, 2011 AT 2:46 AM