FJ60 F2 stock choke system

[newindustar]

I don't fully understand the choke system on my stock F2.

1. My choke is always wide open even cold and I don't see what is supposed to close it except the choke cable, why then have a temp controlled choke opener? Someone told me his choke is closed cold but mine is open. My Haynes manual shows choke closed cold and the vacuum bvsv opens it when hot, makes sense but where does the choke cable fit in? Does the vacuum choke opener override the choke cable if you don't push it in as soon as you should? Or is the choke cable to override the temp controlled opener?

If the choke is closed cold what closes it? The only thing I can figure is the choke cable. I can't tell cause my knee broke it when it was pulled out when I was getting out. Is it possible the choke cable can hold it closed cold as well as hot and the choke opener than opens it hot? Really I don't know what is supposed to close the choke besides the cable unless I am missing an external spring but the exploded carb diagram does not show one.

2. HAYNES manual shows the vacuum line going to the choke opener has a tee in the metal part with one end going up to those three ports on the air filter, this makes a constant vacuum leak and there is not enough vacuum on that line to pull the choke opener diaphram. This can't be right, there would never be enough vacuum coming from the air filter can to open the choke. As soon as I plug the vacuum line going to the air filter the choke opener linkage snaps back. Of course in my case my choke is already open. I plugged the line going to the air filter and it runs better without that vacuum leak

Is my Haynes manual correct? It has the choke opener line going to the bsvd which is getting it's vacuum from the little three hose vacuum port in the intake manifold. This would make sense if the steel part of the line did not tee up to the air filter port before going to the temp valve thus losing all it's vacuum pull.



Thanks
Hudson

here's the relevant diagrams, I circled in red the tee :

http://cid-d223cbd79047bf5e.skydrive.live.com/self.aspx/FJ60/choke%20hot%20and%20cold.jpg

http://cid-d223cbd79047bf5e.skydrive.live.com/self.aspx/FJ60/choke%20opener%20circuit.jpg

 

[cruiseroutfit]

Didn't like the answers you got on Pirate

To start, Haynes manuals are fairly worthless for the Land Cruiser applications, OK they are not that bad but they are about 1/10th as useful as the FSM (factory service manual) that can still be purchased new or used.

Lets start with a couple basics. What year is your FJ60 and 2F?

 

[newindustar]

It's a 1985 stock from California. Haynes is all I've got unfortunately. It matches the body decal as far as I can follow but the body decal does not show all the interconnection, more of a logic diagram.

 

[cruiseroutfit]

Is it equipped with a manual pull choke cable? Or is everything vacuum driven?

 

[newindustar]

It got the manual choke cable as well as vacuum operated choke opener (lower) and vacuum operated choke breaker (above). The choker breaker has the 15 second delay green check valve.

Having both manual and vac/temp control is what makes the choke opener confusing, especially in terms of if the choke should be open or closed cold.

 

[newindustar]

vacuum restrictor

Someone on IH8mud helped me see I was missing a vacuum restrictor on the line going to the air filter so the vacuum loss issue is solved for the choke opener.

I still have the question "is the choke normally closed cold and if so what closes it"? If it is normally open hot or cold without the cable pulled what is the point of the two vacuum choke openers? It seems the choke should be closed cold but what closes it? Also what is the logic having both manual and automatic openers? Is one an overide for the other?

 

[cruiseroutfit]

Hmmm, I've never understood them to have an automatic close, just the manual choke cable close on the dash. The vacuum choke pull-off and then the secondary pull-off you mention. Let me browse through my carbs and FSM's and see what I can conjure up

 

[newindustar]

I did determine those two pull offs have the ability to open the choke even if the choke cable is left pulled out. I went through the book process of setting the high idle speed. If you do leave the cable pulled you will have high idle until you push it in even though the choke is opened by vacuum.

It makes sense there is no spring close but at one point I did observe the coil spring that wraps around the end of the choke shaft closing the choke without the engine running so I am not 100% sure.

There is one adjustment screw on the front end of the throttle shaft I am not sure about. I know the high and low idles on the back side of the carb. Do you know what the front one is for?

 

[cruiseroutfit]

...There is one adjustment screw on the front end of the throttle shaft I am not sure about. I know the high and low idles on the back side of the carb. Do you know what the front one is for?

Are you looking at the secondary adjustment screw?

 

[newindustar]

I don't know, I think it is on the front end of the same shaft the high and low idle screws are on on the backside of the carb. I could not find the front one ion the exploded carb view. It can affect low idle as well.

 

[cruiseroutfit]

I don't know, I think it is on the front end of the same shaft the high and low idle screws are on on the backside of the carb. I could not find the front one ion the exploded carb view. It can affect low idle as well.

Pics?

 

[newindustar]

I can try to poke a lens in there later, pretty tight. I have another issue I have to look into as well where the aircon is causing throttle surging. It feels like cruise control is pushing down the gas pedal every few seconds when aircon is clutched in.