Carb Icing
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New User
Joined: Dec 2013
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Carb Icing
Hello All! ive been fighting a carb icing issue on my 77, poor running when damp, runs great after t-stat opens yadda yadda etc. now my question is how do you guys handle this problem, do you just keep your nice shiny open element air cleaner on and deal with the poor driveability till it warms up? yes I have the old closed air cleaner set-up and will put it back on if I have to but isn't there a better way, or should I say a better looking way to solve this issue? id love to see and hear what you guys are doing to get around this problem. my 400 isn't stock anymore and hate to put a stock restrictive air cleaner back on it. you guys have great ideas so fire away! by the way ive thought about putting on a air cleaner assembly off a mustang 5.0 liter with dual snorkels and just run a flexible tube from the snorkel down to a header tube on each side would this be enough heat to cure the carb icing issue? and would it flow enough to feed a warmed over 400. id like it to be a permanent fix and run it year round and of course look better than the factory air cleaner. thanx guys!
Elder User
Joined: Nov 2003
Posts: 778
Likes: 2
From: southeast Idaho
If you put the old one back on you still need to connect the cleaner to the exhaust manifold. I have found that if the choke works correctly and you let it run for a few minutes before driving so there is a little heat in the motor it will stop being a problem. When you start it if it goes to high idle and stays there it should work. I think I set mine around 1600 to 1800 rpm. Before I did that I would sometimes start it keep it running for a few minutes and shut it off if I had the time and go back inside for 5 or 10 minutes give the heat time to soak up thru the carb and it would run good then too
Tuned
Joined: Mar 2010
Posts: 387
Likes: 25
Those pretty chrome open element units that you get aftermarket are not good in cold weather. I live in central Canada and have to keep the factory air cleaners for that reason. The open element type are great for the summer months but icing can be a problem once the temperature dips below freezing if there is higher humidity in the air. I also have a 1967 F100 with an oil bath air cleaner that will ice up. It usually happens when I am rolling down the highway and I take my foot off the gas but the gas pedal doesn't come back. A poor man's cruise control! I have to reach down and pull the accelerator pedal up with my hand. The best fix for that truck is to add generous amounts of gas line antifreeze every time I fill the tank in the winter--no more icing after that. In that case it seems to be caused by moisture in the gas not the cooling of humid air.
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