not sure if ther is a control to adjust the lean and rich setting on my 90 gxl if so where is it.. cant seem to find it...if not how do you adjust the lean and rich any help would great..

 

No

 

so there is no way to adjust it ????

 

No.

 

No.

"Easiest" would be to get an A'PEXi S-AFC or equivalent.
These aftermarket electronics allow you to adjust fuel delivery (at idle).


-Ted

 

what about the idle tune. Coarse and light screws i mean. Technically dont they adjust how much fuel is delivered? I have a 90 gxl and i can do that.

 

How?


-Ted

 

which idel screw are you talking about do you mean the one on top of the intake if not please explain

 

well i dont have much time but there is a screw that will adjust where the throttle will sit at idle ie. when no acceleration or speed is initiated. If you scew in the screw more, the throttle will not be able to rest full shut (throttle will be more open at idle). If you unscrew it, it allows the throttle torest farther back (throttle more closed at idle) etc. I might be wrong in thinking this but thats what i did.

 

No one should ever mess with these controls unless absolutely necessary. They also control the mixture only at idle.

 

No, they adjust how much air enters the engine, and the ECU injects fuel accordingly. The mixtures do not change.

Other than the minor idle mixture adjustment on S4's (the variable resistor), there is no way to adjust mixtures without adding aftermarket gear. Stock mixture control would allow anyone to make potentially damaging (not to mention illegal) alterations to the engine's tune, and no manufacturer is going to give you that.

 

You're are correct in this sense - you are wrong that the screw adjust fuel at idle.


-Ted