niwid
Posted a lot
Posts: 1,754
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gonna be modifying the carb on my mk2 polo 1043cc. the carb is a pierburg 1b3 auto choke unit
just wondering how i change the fuel/air mixture as its running very rich a atm, and as a result, drinking fuel and stinking
cheers
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ianal
Part of things
Posts: 37
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Feb 11, 2012 22:35:16 GMT
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When I was training as a mechanic, I remember the Pieburg carb'd dubs being problematic, we converted loads to Weber carbs with great results. I'm sure they were 'direct' replacements too
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Last Edit: Feb 11, 2012 22:36:00 GMT by ianal
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niwid
Posted a lot
Posts: 1,754
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Feb 13, 2012 14:33:28 GMT
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Feb 28, 2012 17:31:39 GMT
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Hello buddy, 1.5 inches underneath the fuel inlet on the carb you will see a screw that is very awkward to get to without taking the air filter housing off. This is the idle mixture screw, get the car warm (go for a 15 minute drive.) and then you're ready to start adjusting, it will affect your idle speed,..... mixture shouldn't just go out of adjustment however... has anything been added to the car etc?
If this problem has just started to happen for no apparent reason,.. then do not mess with anything like mixture settings, as said, they do not simply go out of adjustment for no reason, often on Pierburgs it is a problem that appears to point towards something like the mixture screw, when actually it's a different part causing the problem.
Firstly... I would suggest your Autochoke could well be the culprit and simply needs taking apart, cleaning, lubricating, and re-assembling. Where abouts are you located? I may be able to help you if you're close enough...
If moving to manual choke from a Nova, be aware you'll have to get a solid core choke cable. Normal multi-strand will not work as the choke has no return spring.
P.S. Off topic, however,.. I'll also add,... Pierburg carbs are fantastic but often poorly maintained. They are replaced by and large by people who do not have the patience to troubleshoot, the time to troubleshoot, or the inclination to learn how it works and why it may have gone wrong. Most problems are not with the carb itself, but the numerous ancilleries added to them over the years.
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