MustangMan00

.032 are what mine are gapped at

sonicx

sooo....

MustangMan00

01mggt asked.....i dunno how it affected mileage, I dont drive the car everyday anymore

sonicx

okay.... well regardless it was a fun thread and i feel like i've learned something new today so mission complete i guess.

Z28KLR

I haven't tried it yet, but the last time we had this thread Cliffyk threw out the idea of putting a 1/2" o.d. (I think that was the size he mentioned) copper pipe cap, drilled out the same size as is mentioned in the iac sticky, into the tube leading to the iac; easier than making a new gasket and easier to install or remove if needed.

huey_33

Sorry it took so long, but I went out and got boogered up with my buddies. To be honest with you, I didn't see any change in gas mileage. I still fill up about once every 2 weeks. If you were wondering why, I live on an air force base and live practically 1/2 - 3/4 miles from work. So with my driving habits, nothing has changed. And I have no idea about a change in HP, still feels the same when I get on her. And I did it the hard way, I used gasket paper and kept making new ones until I had the idle where I wanted it.

cliffyk

Placing a restriction in the IAC flow path, whether by using a gasket/plate or using a drilled 1/2" copper pipe cap will have no effect on fuel economy or power--it simply limits the amout of air that can flow through the IAC.

If the orifice is too small the car will idle poorly or stall when you cut the throttle, if it's too large there is little to no effect.

I made one of aluminum bar stock, it is inserted in to the IAC feed tube-as would be a drilled copper pipe cap. I have found a 0.290" orifice to work best.