Choke Question

[sinannasirli]

Hi All,
I have recently purchased a 4x4 1969 Suburban with i6 250 ci engine. I will try to make it as stock as possible.. My question is about the choke. Looking to the carburetor, it looks like it is an automatic choke. And as far as I have read on the forum and owners manual, this is the standard automatic Rochester carburetor.

But also I have a pull type switch (looks like the choke switch). Is this for the choke? Is my carburetor aftermarket? (Or is the button/switch?)

Thank you in advance..

Regards

Sinan

[geezer#99]

Welcome Sinan!
Yes your carb has been changed to an automatic choke type.
Originally it would have been a manual choke type.
The choke/switch is stock. It’s just a cable connection to your carb.
You need some more parts on your intake and carb to make that carb work correctly.
You can adapt a manual choke kit to that carb or if total originality is needed you’ll need to find a correct carb.
Take some more pics for us.
Not closeups like you have now.

And here’s a link to some pics of what your carb should look like.
https://www.google.com/search?tbm=is...10.r45zXc0WsRY

[sinannasirli]

Hi,
Sorry for delay.. i had some trouble trying to take and resize pictures..
So i think i have to either add a manual choke/find stock carburetor(might be difficult here) or fond missing parts for the auto choke so that it works corect?
Here are the pictures, hope they are okay..

Thank you!

[geezer#99]

Very good pics!
Your intake doesn’t have the parts on it to hook up your carb automatic choke.
And your carb doesn’t have the parts on it to hook up a manual choke.
You either need a new intake or a new carb.
Neither one is a good solution.
A new carb doesn’t come with the bracket you need to hook up the choke cable.
A new intake won’t come with the automatic choke parts.
I’ll post a link to what your choke should look like.
You can get choke conversion kits that will allow you to hook up your existing choke cable to your carbs automatic choke.
One like this. It comes with a new cable too.
https://www.ebay.com/itm/Dorman-Help...-/142978536692

Here’s the link to pics of what your choke should look like.
https://www.google.com/search?tbm=is...10.r45zXc0WsRY

Let us know what you’d like to do.

[sinannasirli]

Originally Posted by geezer#99

Let us know what you’d like to do.

Actually as it is not quite possible to make it run with the automatic choke, I have to source these manual choke kits you mentioned

[michael bustamante]

actually, does a 69 have a manual choke? the choke knob stopped being in the dash in 1968.
I may be wrong, ive only owned 67 ad 68`s but im pretty sure theres no choke knobs in 69-72

[sinannasirli]

Mine is 1969 and there is a choke button. I am pretty sure because VIN number mach and Chevrolet letters are on the grille..

[geezer#99]

That would be the best thing to do.
There are some on eBay in England. Closer too you than the US.
https://www.ebay.co.uk/sch/i.html?_f...&_sacat=163145

[geezer#99]

Let us know if you find a kit.

[sinannasirli]

I will buy the Dorman Help 55101 GM Choke Conversion Kit that you mentioned. Evnthough there are mixed reviews on the kit ( mainly difficulty on installation and that they might need to cut the bracket) this is the cheapest solution ( and I dont know any other solution ).
They are available ar Rockauto where I buy my parts. from. So this will go into the shopping cart, as soon as I order more parts..

Thanks for your help!

[geezer#99]

Excellent!
With a manual kit you won’t need the linkage and vacuum pot that your carb has now.
When you remove it remember to plug the vacuum port it’s plugged on to.
Best of luck to you!

[sinannasirli]

Just arrived!!

[geezer#99]

Excellent!
If you encounter any more problems hooking it up be sure to ask.
And pics once you do get it on would be nice.

[sinannasirli]

Hi,
When attempting to install the manual choke, i realised that there is a vacuum line coming into the lower port of the carburetor from the distrubutor (i forgot to say it was converted to electronic ignition). Then there is another line coming from an upper port of the carburetor to the vacuum diaphram valve, that supposed to control the choke.
So i am thinkng... maybe instead of the thermo receptor at the intake valve, is the choke controlled by the electronic ignition??

Either way it does not look like it is opening/closing the choke, because even with the valve is closed fully or open fully, that does not pull/push the choke rod, as it is not hooked correctly, the connections are loose..
Maybe that was the main problem of the choke not operating correctly?

Can you please suggest what i shall do? I have also found an earlier type carburetor that was removed feom the PO, so they might have upgraded to automatic choke when upgraded to electronic ignition (which i have no clue about how it works, as its too modern for me!)

Pictures below..

[sinannasirli]

Vacuum valve

[geezer#99]

There’s a pic in here in post #11 of how an automatic choke works. It has a choke stove and linkage rod. Your intake doesn’t have that.
http://67-72chevytrucks.com/vboard/s...d.php?t=416118

The distributor vacuum line doesn’t control your choke. It’s for your vacuum advance.
You need to remove the choke pot on yours and plug that port.

[sinannasirli]

Originally Posted by geezer#99

There’s a pic in here in post #11 of how an automatic choke works. It has a choke stove and linkage rod. Your intake doesn’t have that.
http://67-72chevytrucks.com/vboard/s...d.php?t=416118

The distributor vacuum line doesn’t control your choke. It’s for your vacuum advance.
You need to remove the choke pot on yours and plug that port.

So i should leave the distribitor vacuum line hooked up as it but plug the one that is going to choke? Thank you