ISC Module on 4.9

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   My question is, do i really need the idle speed control? Doesnt it just set the 

rpm higher when a cold start occurs, and adjust idle when slowing down in 

an automatic? Mine is a 4 speed and when im decelerating you can feel the 

ISC lag a little with the throttle and it just annoys me. Also the engine is very 

healthy and will start in freezing and below temps without a problem and 

idle at the set 600rpm when its cold, so why do i need the ISC? For oneits 

annoying, two, it looks terrible, three, it weighs like 3 lbs. 

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orange Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 September 2010 Location: United States Status: Offline Points: 106	Post Options Post Reply Quote orange Report Post Quote Reply Topic: ISC Module on 4.9 Posted: 25 April 2011 at 3:16pm
	My question is, do i really need the idle speed control? Doesnt it just set the rpm higher when a cold start occurs, and adjust idle when slowing down in an automatic? Mine is a 4 speed and when im decelerating you can feel the ISC lag a little with the throttle and it just annoys me. Also the engine is very healthy and will start in freezing and below temps without a problem and idle at the set 600rpm when its cold, so why do i need the ISC? For oneits annoying, two, it looks terrible, three, it weighs like 3 lbs.
	Orange 4.9

Capt Fiero Members Profile Send Private Message Find Members Posts Add to Buddy List Admin Group Founding Member Joined: 12 February 2007 Location: Canada Status: Offline Points: 4039	Post Options Post Reply Quote Capt Fiero Report Post Quote Reply Posted: 26 April 2011 at 7:14am
	Yes you need the ISC, it constantly adjusts the engine idle from cold fire up to warm running. If you did not have it, you could have an engine that would not start cold and as it warmed up the idle would keep creeping higher and higher. Also the computer uses the ISC to help figure out if you have vacuum leaks, It knows what the idle should be and if it has to correct the throttle position to far closed, it will let you know that something is wrong by setting a code.
	Capt Fiero 88 Fiero GT 5spd V6 Eight Fifty Seven GT V8 5spd.

orange Members Profile Send Private Message Find Members Posts Add to Buddy List Senior Member Joined: 15 September 2010 Location: United States Status: Offline Points: 106	Post Options Post Reply Quote orange Report Post Quote Reply Posted: 26 April 2011 at 4:43pm
	Thats what i thought, so the computer does use info from the ISC to run better. Ok. Is there any way where i can make it only work for idle? not while revs are coming down? Like maybe twist in the rod a couple turns so it... neveremind. I just really hate it messing up smooth decalls!
	Orange 4.9