algae1


The source of the idle air comes from inside the air mixture box. If idle air is not restricted the increased air flow should pull down the air meter plate increasing fuel causing increased idle. Restricting air reduces meter plate deflection thus reduce idle.

With the idle valve removed air bypasses meter plate resulting in no fuel!

It is important to eliminate bypass air.

Why not try replacing idle valve with a tube making sure all air goes through the air flow meter. If that results in low idle I would suspect other causes of low idle. If the result is high idle the problem lies with the parts you are investigating.