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Old October 22nd, 2019, 11:06 AM   #14
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Join Date: Jun 2016
Location: London ON, Canada
Posts: 230
Default Re: Holley 2100 info wanted

Not having the heat risers functioning could cause a rich condition as well. Without the heat riser heating the the intake runner, the fuel can't atomize properly. When the engine is running, the intake directly under the carb gets super cold. I ran into that problem with a plugged heat riser tube. Mine was like ice cold. The cold air will cause the fuel to become dense and make big droplets rather than nice vapor of fuel.
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