IACV troubles

KING · Post by **KING** » Sat Apr 25, 2009 12:29 pm

its a built gsr sleeved to 84mm
10:1 cp slugs
ls manley rods
ls scat crank
port and polished head with .5 over rev valves
precision 780 with fjo driver
neukin ram horn mani and 3 inch down pipe
precision sc61
3 inch exhaust
aebs intake mani and 68 mm throttle body
msd set up
ngk race plugs
60 psi fuel
gm 3bar map

so I have tried to set the idle air speed and when I unplug the iac car dies. Well I changed it out to another iac that was "supposed" to be working properly. OK its changed out try again same thing, car just dies. Im not running coolant to the iac like most people dont, but I dont feel that matters at all. Do u think I just got another bad iacv or could there be another issue at hand?

hondamanmike · Post by **hondamanmike** » Sat Apr 25, 2009 12:34 pm

the iac is a thermo valve, in order for it to work it needs some sort of temp, in this case coolant running through it.

hook coolant lines up to it and see what happens

Martian · Post by **Martian** » Sat Apr 25, 2009 10:11 pm

it doesn't need coolant, its suppose to die when the IACV is unplugged.

KING · Post by **KING** » Sat Apr 25, 2009 10:35 pm

Martian wrote:it doesn't need coolant, its suppose to die when the IACV is unplugged.

I think u are half right and half wrong. I dont think it needs coolant but its not supposed to die when u unplug it.

Setting the Idle Speed
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To adjust the idle speed:

1. Warm up the engine.

2. Set the idle speed to 850 rpm and move the duty cycle adjustment to the middle.

3. Unplug the idle valve.

4. Adjust the bypass screw until the engine runs at 450 rpm. If you can not reduce the idle to 450 rpm, then you have an air leak. Fix this before proceeding. If the engine will not run with the idle valve disconnected then your bypass port is clogged. Fix this before proceeding.

5. Plug the idle valve back in.

6. Clear the idle valve error. You should now get a smooth idle at 850 rpm.

7. Increase the engine speed to 2500 - 3000 rpm and abruptly let off the throttle. If the engine speed dips below 850 rpm, move the duty cycle slider to the right. If the engine speed hangs above 850rpm for some time, move the duty cycle slider to left.

Some engines prefer 900 or 950 rpm idle speed