Why would you expect the mixture to lean out for driving conditions just by setting the throttle position for idling? You have a closed-loop system that uses a wide-band sensor. Check your AFR target. If you're using gas and you want to lean it out, then you don't want to see below 14 because that's rich. You could probably idle just fine at 14.5 or even a little higher. Your light cruising AFR target should be raised if you're smelling fuel when you're cruising. The system is a closed-loop controller. It is trying to give you what you command. Your input command is the target AFR. The controller makes the mixture rich when the AFR target is below 14.7 for normal gasoline. Or you might have a weak spark that would result in unburned fuel in the exhaust. The Oxygen sensor picks up the extra unused 02 and then adds more fuel because it thinks the mixture is lean.
Hey Brah, You have 2 idle screws, one for front and back, and also recheck the linkage for secondary's, seems they are off allot of the time, front and rear butterflys should be cracked.
Why would you expect the mixture to lean out for driving conditions just by setting the throttle position for idling? You have a closed-loop system that uses a wide-band sensor. Check your AFR target. If you're using gas and you want to lean it out, then you don't want to see below 14 because that's rich. You could probably idle just fine at 14.5 or even a little higher. Your light cruising AFR target should be raised if you're smelling fuel when you're cruising.
The system is a closed-loop controller. It is trying to give you what you command. Your input command is the target AFR. The controller makes the mixture rich when the AFR target is below 14.7 for normal gasoline.
Or you might have a weak spark that would result in unburned fuel in the exhaust. The Oxygen sensor picks up the extra unused 02 and then adds more fuel because it thinks the mixture is lean.
What are you plugged into for measuring that iac sensor? The obd?
Cb BroWnN FiTech unit comes with a hand held to change settings and such and it has some displays.
How did you het it to idle to do this?
I just did this a few days ago on my my 454 in a 73 nova. But i never checked my timing. Lol
Lol
That reminds me, I kinda need a new one, mines, uh, dismantled.
Hey Brah, You have 2 idle screws, one for front and back, and also recheck the linkage for secondary's, seems they are off allot of the time, front and rear butterflys should be cracked.
jocrp6 thank you, it is all finally dialed in
wrong