Humidity/condensation cold engine run

[rares]

The engine is chocking, sometimes stalling in cold or humid weather, but not below freezing temperatures and always only for few minutes after starting it. It did not happen all winter, but as soon as the temperature warmed up a bit (above freezing) and if humid (rainy or foggy mornings) is the car starts ok, but immediately starts chocking. When the engine warms up, it runs just fine. The best I can do is to warm the engine for few minutes, turn off the engine, wait for one or two minutes and start again. I have no problems after that.
It seems to happen ONLY when the weather is humid and there is condensation on the car/engine.

Chevrolet Venture 1997

[Huney1]

A pilots nightmare is carburetor icing which can occur at surprisingly warm tempratures and we get carburetor icing in the summer. All depends on humidity and atmospheric conditions I was wondering if yours might be icing up. There's a duct that takes warm air from the exhaust manifold to the throttle body to prevent icing, or at least that's the way it use to be, and maybe the warm air duct is inoperative on yours. I might be way inleft field on this one but just offering thoughts.

I thought some folks might be skeptical of icing, so I Googled and found this excellent explaination bearing out what I said. http://www.misterfixit.com/carbice.htm

[534BC]

I would look into the secondary wires, cap,ect. Possibly can start it on a dark/wet night and see spark under the hood. Or spray with wd-40 and see if it's any better.

[rares]

Originally Posted by Huney1

A pilots nightmare is carburetor icing which can occur at surprisingly warm tempratures and we get carburetor icing in the summer. All depends on humidity and atmospheric conditions I was wondering if yours might be icing up. There's a duct that takes warm air from the exhaust manifold to the throttle body to prevent icing, or at least that's the way it use to be, and maybe the warm air duct is inoperative on yours. I might be way inleft field on this one but just offering thoughts.

I thought some folks might be skeptical of icing, so I Googled and found this excellent explaination bearing out what I said. http://www.misterfixit.com/carbice.htm

Thank you for your reply.

[4432flying]

Carb ice should only occur when the engine is equipped with a carb, and that has a venturi . I dont think you would have ice with a fuel injection engine. I am just an old pilot and aircraft mechanic. Good luck.

[gkindub]

rares, this may be a pita but you need to check out your ignition system from spark plugs on back. In addition check for any codes. With this info you may get some idea of what the problem is and if you report it here I'm sure someone will recognize the clues and help you solve the problem.
Regards, gb