Originally Posted by Michaelgoesrawr
That makes sense. I'll be sure to give it a scrub and paint it although I don't have the carb anymore. Is there a reason it hunts like it does and can I fix it? Lol.
In general, many things can cause the idle to hunt. Some engines just do, notably earlier designs.
Aside form that, if you are in closed loop, it means that the ECU is making fine adjustments based on what it thinks is happening. Engine slowing down a few rpm? Make it faster. Oops, now to fast? Make is slower. Repeat constantly and there is the hunt.
If there is a lag in reading, if there is a lag in adjusting, if there is not a fine enough correction, then the hunting gets worse. Remember the old days of speed controls? (Probably not.
) You would set a speed, say 65, and the vehicle would hunt between 64 and 66. Totally annoying, they were.
So it is hard to say what you can do about it. maybe nothing. Maybe just throw a lot of parts at it. But the hunting by itslef should not cause you to fail smog, unless it is running crazy rich for that split second before it goes uber-lean.
It also seemed like your idle was set kind of high. Try backing it down to the lowest speed at which the motor still runs smoothly. That can help hunting on a carburated engine where the carb is operating at the transition of the loww-speed and mid-range circuits, not deciding where to be.