adjusting the screw on the AFM

[dug]

Hi,

I've been trying to make my ae92 idle smoother, so i've adjusted the idle screw aswell as the screw on the AFM.
I know that adjusting the screw on the AFM changes how much air bypasses the AFM, assuming adjusting the screw clockwise would decrease the amount of air and vice versa.

Then thing i don't understand is when i turn the screw(AFM) clockwise it seems like the idle would increase a tiny bit and the car seems like it idles better. When i do the opposite turning the screw anti clockwise the car idles with a repeated choke. idle example smooth, smooth, smooth, choke, smooth, smooth, smooth, choke....

Why is this?? any help is appreciated!
cheers,
dug

[FASTFOO]

It is basicly idle mixture.
If you turn it in then it closes the by pass up and thus forcing the air to go past the vane. This make it read more air and it will run more fuel at idle.
If you turn it clockwise and the idle comes up and smother then it just wants a little more fuel.

Of couse you should never need to adjust this if every thing is working right. You may have an air leak somwhere.

Regards
MATT.

P.S. odd that an AE92 has an AFM.

[Mr Revhead]

AFM + AE92 = 4agze

best not too touch that.... they should not ever need touching
have a look on the casting next to it.
there should be a number that gives you the distance from the top of the hole to the screw
thats where it should be set.
iirc its not the idle mixture...
it adjusts the tension on the spring therefore effecting the mixture through the entire rev range. some ppl running extra boost on those ecu fiddle with it to increase fuel instead of getting a proper tunable ecu

[dug]

AFM + AE92 = 4agze

best not too touch that.... they should not ever need touching
have a look on the casting next to it.
there should be a number that gives you the distance from the top of the hole to the screw
thats where it should be set.
iirc its not the idle mixture...
it adjusts the tension on the spring therefore effecting the mixture through the entire rev range. some ppl running extra boost on those ecu fiddle with it to increase fuel instead of getting a proper tunable ecu

Just to clarify things,
Here is a pic of the AFM from the repair manual.
http://members.optusnet.com.au/dougtran/pics/afm.JPG

Revhead,
From the AW11 repair manual, it shows that the screw opens and closes the bypass passage and it does not seem like it control any sort of spring. Please correct me if i am wrong.

[lexsmaz]

It is the idle mixture adj screw ..
But also must have a slight effect through the rev range as well on the mixtures, as FASTFOO said in an ideal world it should not need adjusting, but if you are only turning it a small amount i wouldn't be to worried, check all the obvious hoses & connections for tightness etc .. but if its done highish k's even inlet valve guide wear etc, can have an effect on the mixtures ..