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Weber 32/36 tuning issues


BeachKidd

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I have a 78' 620 king cab with an l20B  and just installed a new weber 32/36 DGEV carb with electric choke. When I went to start the truck cold the idle seemed higher than it usually did with the stock carb and electric choke and it also wont kick down. Im new to this kind of stuff and all the help I can get is appreciated!

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High idle causes...

 

 

Fast idle set too high.

Idle speed screw too far in.

Choke not shutting off or set too rich. Electric choke should have power when engine running.

Throttle cable or linkage not adjusted properly

Secondary stuck or not closing

Primary stuck or not closing.

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There is no fast idle when the choke (top butterflies) are completely open. Just the regular idle.

 

Sounds like it needs adjusting rather than tuning. After installing a new carb, always adjust the choke, then after warming the engine fully adjust the idle speed and idle mixture.

 

Fast Idle only comes into play when the chokes are closed or partially closed.

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