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Old 02-05-2004, 10:57 AM
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cold weather running with Edelbrock

I have a daily driver 65 Riviera with a Edelbrock 1406 carb. electric choke. If the weather is below 40 F then for the first 5 miles, it hesitates, spits, sputters, dies sometimes... when accelerating from a stop. The choke is closed and it starts with a touch of the key, but then driving it is a pain till it warms up. Here in Texas 40 F is cold. I dont know what would happen if it was 20 F.
I have been told that this is common on Edelbrocks. Anybody else?
What is there to a choke besides the choke flap? I have my fast idle setup but maybe a little low.
Thanks

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Old 02-05-2004, 11:08 AM
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I have the same carb and only cold weather gripe I have is that it idles pretty high (1500+ rpm) until it is warmed up. I have the choke adjusted 1 mark from full lean - it may make a difference.
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Old 02-05-2004, 03:35 PM
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Hey Justinh,

I have the same carb (elect. choke) with the same problem here in Cali. - about 40-50 weather. It is scary to drive it until the engine warms up, otherwise it would stall on me. It happened to me a few times right on the street. When it was nice and toasty hot in the summer, I never thought it would ever happen to me.

Regards!
Denis
'67 Camaro RS
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Old 02-05-2004, 04:02 PM
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your carbs

there's nothing wrong with your carburetors. because my rochester does the same thing.. if you don't have a heat stove\ emission duct, the condensation in your carb will create small ice pellets that fall down into your carb causing it to choke for air, also drawing moisture into the fuel mixture... therefore your car\truck is gonna run like trash until she warms right up to keep the ice from forming.... it's almost always -30 C down here and that's cold...
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Old 02-23-2004, 02:39 PM
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But Jus10, here in Texas, cold is anything less than 50 degrees!!!

Also when the first 30 seconds I have to lightly pump the petal or it dies. I guess it is not going into high idle. I will check that.
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Old 02-23-2004, 04:56 PM
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Running a carbureted (any brand) engine requires you to let it warm up longer before driving off. I let the temp gauge get almost up to 'normal' operating temp before driving. It gets in the teens here in Western North Carolina during the winter months.
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Old 02-23-2004, 10:54 PM
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i agree with Jus10. You need an air preheat/stove device to warm the incoming air into your carb'. Having cold air rushing through a venturi that has gas atomizing is a good recipe for ice to form. The classic symptoms are - cold starting is perfectly fine. Engine initially runs well. The combustion chambers and cylinders then heat up and the need for choke is no longer required. Problem is, the intake manifold and carb' are still cold with ice forming on the throttle butterfly and jets, and the only way it wants to drive is near wide open throttle! It's not until sufficient heat has soaked into the fuel intake system that drive-ability would be restored.
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Old 02-23-2004, 11:16 PM
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I have that 1406 on my 77 Chevy truck.
and I have the same problem. it idles at 2000 rpm when it's cold.
you can adjust the choke were it won't choke so long, or choke
longer and make more fast idle.
but without the heat stove it will always be cold natured.


Shane.
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Old 02-25-2004, 01:52 PM
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Is this an Edelbrock issue or a carb problem? Do the Carters/Rochesters do this?

With my electric choke, how can I add a stove pipe to get the hot air from the manifold?

Can I add a stove pipe that would just pull the air around the exhaust manifold all the time? Something that I could remove when the season changes?
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Old 02-25-2004, 02:19 PM
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Try adding more tension to the choke (richer), sounds like it's opening too much, too fast, the pulloff should open it about 3/16-1/4 initially when it starts. It may take some time to get it right!
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Old 02-25-2004, 03:05 PM
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The carb is icing up. The colder temps cause this and humidity makes it worse. This is a very common occurrence on carbs with open element air cleaners or a malfunctioning heat door on a stock breather. One way to verify this is when it starts acting up, shut it off for a couple of seconds and then restart. It should start and idle ok for a bit. This is because the heat from the engine has melted any ice build up within the carb. It is actually less of a problem in extreme cold as there is less moisture in the air. The only fix is to get hot air into to the carb.
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