1.8 Air Box Adjustment

[Tidybuoy]

I realize that to get things perfect, I will need an exahust analyzer but I was wondering if there is a way to ball park the mixture adjustment on the air flow meter. I have a stock 1974 1.8 Ljet.

When I turn the screw clockwise, does this richen or lean the mixture?

Unfortunately, I have messed things up thinking that the airbox screw was the idle screw. I have learned a lot since then but I was hoping that someone could give me some tips.

Currently, my mixture screw is exactly 4 full turns backed off from fully screwed in - but, I have no idea is this is even close.

Any advice would be great - Thanks!

[Dave at Pelican Parts]

Screwing that screw in closes the passage that lets air go in without getting measured by the air flow meter. That means less un-metered air is going in, therefore the mixture gets richer.

I don't know that there is a baseline such as "X turns out and it's pretty much right on." I'm not sure how you'd set it without a gas tester of some kind. Maybe set it for "best idle"?

--DD