Really big choke problem.

[mille]

When I starts engine idle is about 1200 rmp, after run increase to 2200 rmp (choke starts). Problem begins in this moment, choke can't close, even warn up engine. After worm up, idle is still about 2200rmp and I've to drive on open chocke by next 15 min and finally choke close. The second solution: I can stop the engine, wait several minutes, run again, then everthing is ok.
Why doesn't choke vacum close?
thanks for help.

A20A2 engine.

[A20A1]

I'm confused as well, partly because I don't quite understand the situation yet.

When you say choke closed, do you mean the choke is letting more air in?
Usually I would say the choke is Open when the car is fully warm, that way it lets in more air.

You might want to check your coolant level.

[Honda-Master]

make sure u get vacc at choke pull off diaphram on hoses 18 and 19..if u got no vacc there when engine is hot u could have bad thermovalves ,, also make sure u have power to the wire going to choke housing ( blue/white ) wire i believe ,those are the 3 things that will pull the choke off when engine get hotter ..also make sure choke blade is not gummed up and it moves freely