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Four barrel wont open - Impala Chevrolet Cars & Trucks

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What year, what engine, Carb ?

Posted on Jul 25, 2009

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Carburetor on my 85 Deville only one injector works what could be the problem


There may not be anything wrong. On a two-injector throttle body, the second injector acts similarly to a four barrel carburetor. On a four barrel, only two barrels supply fuel until you kick the accelerator pedal down hard for quick power for passing as such. At idle or normal cruise the second injector in non-operable. Only when you kick the pedal down (passing gear in old school terms), does the second injector activate.

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Why four barrels do not open 65 4100 carb


The choke linkage is not properly hooked up or adjusted. The throttle linkage is not adjusted properly or there isn't enough vacuum. The choke linkage has a tab that prevents the 4 barrels from opening when the choke is engaged. There is a tab on the throttle linkage from the front 2 barrels that will engage the secondaries when they rotate past a certain point. Vacuum opens the top plates on the secondaries.

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DOES A 1987 305 CHEVY ENG HAS A COMPUTOR.


As long as it is a carbureted engine , simply change intakes and install your four barrel . Yes it is computerized , but will not interfere with carb swap .

Dec 24, 2012 | 1978 Chevrolet C1500

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86 ford 460 cu. in. Ford w/ Holly four barrle carborator secondary


On most models, the secondary barrels would only work if the primary are in wide open position, and even then the range of opening is small.
The engine should run past 3000 RPM on just the front barrels, so you may have something else going on.

Aug 23, 2012 | Cars & Trucks

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Have you tried using a spray carburetor cleaner? Also, is the fuel filter clean?

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1 Answer

The four barrel does not kick in, What can I do?


Are you saying vehicle is running on 2 barrels?
Time for a rebuild if thats the case. Kinda strange that secondaries are not opening. Make sure likages are not binding. Thats the only time I've ever seen that linkages binded.

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that 2 barrell needs some more work done to it and what was wrong with the 4 barrell the 2 main jets in a 4 barrell are smaller than a 2 barrell as long as you dont engage the 4 barrells your using less gas anyways.

Nov 19, 2009 | 1985 Ford F 250

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spray excess WD 40 or similar onto the key whilst moving it in & out of the lock or dribble it down a toothpick/cocktail stick in to the lock or hold the lock open with the stick and spray into the lock barrel

Sep 02, 2009 | 2006 Peugeot 604

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