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Weber carburettor problem on 1971 Ford Cortina

I have a Mark 3 Cortina which the previous owner fitted with a Weber twin-downdraft carb (I think it's called a DGAV 32-36) and also an automatic choke. I would like to change it back to manual choke and wondered if you might be able to recommend a supplier for a conversion kit please? Also, I have had the car for 9 years, and although the double choke mechanism used to be noticeable when I put my foot down (i.e., it used to suddenly 'take off') , it no longer seems to work, and I wondered if there might be something wrong with the carb - I don't know how it works so it's had to tell. If so, could you possibly help me to diagnose the fault? Thank you for your time.
- Liz Lowe (Hemel Hempstead)

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It has a choke plate used for cold starting
if it has 2 throats ( venturis ) then the second throat butterfly is most likely vacuum operated in which case the diaphragm for the operation will be faulty
I suggest that you take it to an accredited shop that overhauls carbies , and firstly have the manual choke fitted then have the unit overhauled

Posted on Mar 28, 2017


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Posted on Jan 02, 2017

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SOURCE: Ford LTDwith 400m cuts out?

fuel filter or fuel pump problem or it could be the automatic choke is closed and choking motor make sure choke is plugged in on side of carb start car let it warm up with air breather off watch and see if choke opens up .also you can look down into carb when motoe running crack open throttle and see if it sprays gas into intake if it doesnt could be filter or pump. to check fuel pump remove fuel line from carb insert line into small can or bottle so fuel doesnt run ontop of motor and have someone just bump over starter and see if it pushes fuel out line with a descent amount of pressure check fuel filter.and if all that checks out try looking for vaccum line off to check get a can of either and squirt lightly around vaccum lines and listen for car to idle up if it does bad vaccum line. and also check distributer. but it sounds like it is getting to much gas so i would check choke first..... hope that helps .. and by the way you have a 351 modified 400 wich is 351 m 400.

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there is only one way.
you will have to convert to injection and install a electric choke
it is a big job but it can be done.

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SOURCE: My 2002 Chrysler Concorde 3.5

1. check the fuse for the fan motor make sure they operate replace if necessary
2. make sure the fans operate if not replace
3. check lower hose for restrictions/ wear/ swelling soft spots this indicates that the thermostat is suffering blockage, check top hose also for the same. soft spots normally occure when fluid is wasted on the hoses and likely to appear nears a swelling area. Pep Boys quote a price of $275. 00dollars but they didnt say whether parts are included.
4. Manufacture installed the proper stat from the factory stick with it when you cahenge and are notsure whether it was a hi /lo temp you change the specs and cause additional unforeseen problems it supposed to open and close at precise temps anythinf different could cause overheating and computer read the wrong information which will cause the computer to go into a limp mode .

Posted on Jun 20, 2011

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Some carbs are simple and some complex but both should be treated the same way.

Remove the carb and thoroughly wash the outside before turning each adjuster screw in and carefully counting the turns until it bottoms (eg 2.75) so the screw can be returned to the original position.

Most carbs need only thorough cleaning and few, if any, new parts.

The carb should be systematically and completely dismantled making drawings and notes during the process and then each component is thoroughly cleaned ensuring all air and fuel passages and jets are clear and use the reverse process to reassemble.

During the cleaning process each component should be examined for wear or damage using a magnifier and replaced if necessary. It is usually wise to replace the float valve and any flexible diaphragms but this isn't always necessary. If water is found inside the carb the fuel tank should also be cleaned.

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