Hi guys i can't understand what does this thing do. If i plug it in the engine sometimes stay at 3000 rpm after releasing the throttle, but if i unplug it it goes normal to it's 1000 rpm. The one inside the red circle.

 

IACV or FITV for a carb engine. If it doesn't have coolant lines going to it, it will be the IACV (Intake Air Control Valve). If it has coolant lines going to it, then it's a thermo valve (Fast Idle Thermo Valve). By the looks, it's got a wire harness to it so it's an IACV. It also looks like it's got an open port which I'm pretty sure should have a vacuum hose attached to it. But where it should be attached is beyond me.

I currently have only seen FSM pages for the injected engines instead of carb based.

Both the FTIV and IACV are to control idles for different conditions.

 

Thank you very much

 

EDM FSM is "out there" available for download.

 

does anyone know where I can find a FSM? I am having a lot of troubles with my eg3 d13b2, but ANYTHING Honda carb related would help. Cant seem to find a single manual