Guys,
I have an issue with my 1984 Hiace choke and whilst not a Magna or even Mitsubishi it is of the same vintage and the first gens and shares the same primitive technology.

The engine will idle too high and I can kick it down (sometimes might take 2 or 3 kicks) but as soon as I accelerate and stop again it will be idling high again. I have replaced all of the vacuum hoses but this has not helped. The choke flap doesn't appear to be sticking but I can't work out what elase might be the issue. Any ideas what to look at?

Tools

I need to see which one you have

check through theses

all the ebay 84 -? carbys are aftermarket and are---- in most ways-- different to the originals
http://www.ebay.com.au/bhp/toyota-carburetor

basics
have you got slack on the accelerator cable

could be a worn shaft in the carby /alloy housing

as you accelerate the choke spring might be weak and sucking the choke butterfly closed


http://i253.photobucket.com/albums/hh59/magnabuff/toyota/carby%20toyo.jpg (http://s253.photobucket.com/user/magnabuff/media/toyota/carby%20toyo.jpg.html)



as in a magna
or if its a two butterfly carb the lower butterfly is sticking

Bugger me, I typed a big response and it didn't let me post!
My carby is different to your pic. I have tried to post a pic from the service manual but can't make it work, so the carby looks like this one:

http://www.ebay.com.au/itm/TOYOTA-1Y-2Y-3Y-4Y-HILUX-HIACE-CARB-CARBY-NEW-CARBURETTOR-/161707597519?pt=LH_DefaultDomain_15&hash=item25a6861ecf

The accelerator cable seemed to be ok when I have poked around with it previously but will check again. I had it rebuilt probably 7 or 8 years ago and it has been running well since. Without having an intimate knowledge of the choke spring strength how can I tell if it is weak? With the worn shaft are you referring to a shaft on the butterfly? With all of my poking and prodding thus far everything seems to be smooth and move as it should. I have also sprayed carby cleaner on everything in sight that can be reached without dismantling.

Tools

I would be surprised is it was the original carby ..so after market

the design of this carby is different to a magna

is spring set and choke is very difficult if not used to them


only loosen the holding screws enough to set the choke
might have line up makers not sure -- the black bit has to rotate

the small screw on the choke shaft between the black thing and carby body is adjustable
and thats the difficult part ..

if not correct--- the choke wont idle up or down properly


is this close to what your repair manual is trying to explain


cold --the choke butterfly is fully closed and spring is set correctly

withing seconds of start ----the spring must start to lift the butterfly not fully open

butterfly will continue to rise evenly an revs should drop to spec

when temp gauge starts reading reading at the dash the butterfly should be fully open

set idle

without being there I say the choke spring is your problem


http://i253.photobucket.com/albums/hh59/magnabuff/toyota/k%20carby.jpg (http://s253.photobucket.com/user/magnabuff/media/toyota/k%20carby.jpg.html)

On my sigma (similar carburettor) I eventually just build a small bracket to stop the choke butterfly valve from fully closing.
For a long time (years!) it never released after engine start and so the engine would run very rich for 3 or 4 KM together with higher idle.
Car still starts almost as good as with the choke valve fully closed and fuel economy improved lots (with short trips!).

Never found a procedure to set/test the spring assembly!