IAC information
Thread Starter
Drifting
Joined: Dec 2012
Posts: 1,504
Likes: 73
From: Georgetown TX
IAC information
I have mt2500 and I am learning to us it. Can someone explain IAC blocks and what is normal. I adjusted min idle, timing and tps
After I restart it, while warm, I watch the iac reading go back down to 0 and stay near or at 0 while at idle is that normal and should the iac reading rise as rpm increase
Thanks in advance
Mike
After I restart it, while warm, I watch the iac reading go back down to 0 and stay near or at 0 while at idle is that normal and should the iac reading rise as rpm increase
Thanks in advance
Mike
Safety Car
Joined: Jan 2014
Posts: 4,017
Likes: 492
From: Poughkeepsie New York
I have mt2500 and I am learning to us it. Can someone explain IAC blocks and what is normal. I adjusted min idle, timing and tps After I restart it, while warm, I watch the iac reading go back down to 0 and stay near or at 0 while at idle is that normal and should the iac reading rise as rpm increase Thanks in advance Mike
If I remember correctly you should be around15-20. If you scanner is working correctly it's possible that you have a vacuum leak and your motor is pulling air from there.
Last edited by Dt86; Feb 21, 2015 at 10:38 PM.
Race Director
Joined: Sep 2003
Posts: 16,836
Likes: 337
From: Database Error Indiana
That make sense. Low IAC can be caused by a vacuum leak. And thats the effect of an excessive throttle opening. Depending on whats going on a reading of 30 is normal. The ecm can call for more IAC opening if the AC is turned on or if the cooling fans turn on, probably other things Im not thinking of. The parameters are in the tune and can be tweaked when tuning for mods.
Team Owner
Joined: Jul 2004
Posts: 28,376
Likes: 3,260
From: Hartford WI
I need more air, I open up the IAC so I have more counts on the scanner. I don't need it, I close up the IAC and there are less registered counts. I always set IAC by ensuring timing is right and the chip is correct for the application, no air leaks, plugs are good, wires are not leaking, the usual stuff.
Get the motor to running temp and in closed loop. Shut everything off except motor and car in neutual. See what the counts are. I try to target 20 so it gives something for the ECM to back up to and advance to. Rev motor and see where it is. Over 20, back out the screw, rev and repeat. Over 20, turn in the screw, rev and repeat.
Get the motor to running temp and in closed loop. Shut everything off except motor and car in neutual. See what the counts are. I try to target 20 so it gives something for the ECM to back up to and advance to. Rev motor and see where it is. Over 20, back out the screw, rev and repeat. Over 20, turn in the screw, rev and repeat.
Race Director
Joined: Apr 2002
Posts: 10,036
Likes: 346
From: Anaheim CA
I have mt2500 and I am learning to us it. Can someone explain IAC blocks and what is normal. I adjusted min idle, timing and tps
After I restart it, while warm, I watch the iac reading go back down to 0 and stay near or at 0 while at idle is that normal and should the iac reading rise as rpm increase
Thanks in advance
Mike
After I restart it, while warm, I watch the iac reading go back down to 0 and stay near or at 0 while at idle is that normal and should the iac reading rise as rpm increase
Thanks in advance
Mike
