Quote:
Originally Posted by ischmitz
You need to adjust the bypass screw on the AFM. It essentially sets the flapper door position (mixture) at idle. If you let a lot of air bypass the mixture gets leaner because most air doesn't pass through the flapper. If you close the screw the mixture gets richer because more air goes through the flapper.
Remember, the amount of air (metered + unmered) is set by the throttle stop position and not by the bypass screw.
Assuming you loosened the main spring in the AFM you most likely have a richer mixture during idle now with the same air flow pushing the flapper door a little more open. To remedy open the bypass screw by a couple of turns. Remember where you came from so you can alway come back. I believe the default setting is something like tighten it all the way and then back it out by three to four turns. Best if you had a wide-band O2 sensor to properly set mixture during idle.
ingo
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That makes sense. I will try that out. Where, exactly, is the screw located? Do I need to remove the AFM again?