Question about the IAC
#1
Question about the IAC
How many steps should we be logging at idle on a '91 tbi 305? I've been logging and tuning the fuel for the last couple of months and i've got the car runnin like a champ now, i've been following "Free Tune" and I read about the 5-10 steps at idle, mine seems to be around 16 when I first start? Are there factory specs for IAC or does the ECM control it for the most part?
Thanks.
Thanks.
#2
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Car: 91 RS
Engine: 350 TBI
Transmission: WC T5
Axle/Gears: 3.42 Posi
The ECM will open the IAC however many steps it takes for the engine to maintain the set idle speed. You can control how many IAC steps are required by adjusting the idle screw on the TBI unit. Turning the screw to the right will slightly open the throttle meaning the ECM doesnt have to open the IAC as much to maintain proper idle speed. Turning to the left will close the throttle causing the engine to want to stall and the ECM will open the IAC however many steps are needed to compensate.
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