[ta man]

Originally Posted by Navy Horn 16

Setting idle air by AFR isn't the correct procedure anyway. You should be setting your idle air with a vacuum gauge.

The first mistake most people make when they get an AFR gauge on their car is to try and chase ideal stoich all over the place from idle to WOT. My car idles very lean, and I get great fuel economy with lean cruise at about 16:1.

Cars with really aggressive cams like more fuel at idle.

The correct answer for your car is whatever air:fuel setting makes the most vacuum. Also, verify your timing. A lot of folks have chased their tail with idle tuning on their carb just to realize their timing was way off. I was once one of those guys.

A vacuum gauge is a handy tool but like the AFR gauge don't get hung up on the numbers. The best idle mixture I find is the strongest most stable idle in gear foot on brake..many times this is a slighty richer mixture then the AFR "should be" or a slightly lower vacuum reading when in park. I always tune my cars so they can sit at a stoplight for a couple minutes with zero issues.