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Author Topic:   carb question

Posts: 50
From: kailua, HI
Registered: Oct 2002

posted 10-16-2002 02:50 PM     Click Here to See the Profile for stock69   Click Here to Email stock69     Edit/Delete Message   Reply w/Quote
o.k. my carb is a stock 2100 with a thermostatic choke. my questions are:

the inlet on my choke is capped off. i was wondering how this affects the opperation of my choke if at all. also were does the tubing to the choke run from to send the temp to it. and does this affect my fast idle because my car does not seem to fast idle when cold.

and my second question is my choke does not close all the way because of a washer on the stud the the air filter housin mounts to. is this susposed to be like this or is it the previous owner trying to rig something.

anything would be greatly appreciated

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Posts: 25539
From: Lyons, IL, USA
Registered: May 99

posted 10-16-2002 03:24 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
YOu need the heat to shut the choke off. The heat from the exhaust unwinds the bi-metal spring to open the choke.
The fast idle is controled primaryly by the linkage that is tripped by the bi-metal spring in the choke housing.

Alex Denysenko
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Posts: 50
From: kailua, HI
Registered: Oct 2002

posted 10-16-2002 04:38 PM     Click Here to See the Profile for stock69   Click Here to Email stock69     Edit/Delete Message   Reply w/Quote
so should i leave the choke capped or un cap it so the heat can heat inside or does any of this matter. should the choke be able to close all the way

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Posts: 3019
From: alvaton,ky,usa Suburb of Bowling Green, M&M #79, MCA #29208
Registered: Jun 99

posted 10-16-2002 11:20 PM     Click Here to See the Profile for kcode   Click Here to Email kcode     Edit/Delete Message   Reply w/Quote
Welcome to M&M

With your location in the islands, the need for an operating choke is slim or unnecessary. If you are absolutely sure you need the choke, you will have to install a tube from the exhaust manifold to the capped off inlet on your choke housing. As it is now your choke does not do anything. Until you make it operational, I suggest to loosen the three small screws that hold the locking ring on the black cap and rotate the cap until the choke plate is completely open or vertical and tighten the screws. You will not have any fast idle.


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Posts: 53
From: SC
Registered: May 2002

posted 10-17-2002 12:53 AM     Click Here to See the Profile for GypsyR   Click Here to Email GypsyR     Edit/Delete Message   Reply w/Quote
The original choke tube is just that. A metal tube that runs to the exhaust manifold. Vacuum from the carb draws warm exhaust into the choke housing to warm the choke spring. The tube usually rusts at the manifold and is easily broken by a mechanic. Tough to repair.
A simple solution would be to replace the choke housing with one for a later model 2100 that has an electric choke. A 75 F100 302 should be ideal. You should be able to buy one at almost any parts store. You may need a different retainer ring (I don't think so) but you should be able to find one at a salvage yard or from anybody that has some old Ford carbs laying around. Do the islands HAVE junkyards?
Anyway. Once you have the housing sorted out, run a wire from it to the STA post on the back of the alternator. Then adust the choke and fast-idle to your liking and you're done. If you choose to do this, leave the tube fitting capped off. If you uncap it, you'll have a vacuum leak. Not usually enough to affect the running of the car, but it could suck in dust and stuff.
Replacing the tube would be the correct way, but attaching it correctly to the manifold will be kinda tough. I've never done it, though I have changed cars over to the electric style several times. Either one one works just as well.

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Posts: 50
From: kailua, HI
Registered: Oct 2002

posted 10-17-2002 11:29 PM     Click Here to See the Profile for stock69   Click Here to Email stock69     Edit/Delete Message   Reply w/Quote
thats alot of help thanks. the islands are hell for building cars cause everything is so damn expensive. the junk yards here a plentiful but have not found any decent ones. ill be back in the mainland within a couple months though

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