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Old 02-08-2008, 04:10 PM
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91 sbc 350 TBI freezing up

i got a 91 GMC with a SBC350 TBI and every time i go to start it up in cold weather the throttle body is frozen shut. The gas pedal is rock solid and if i do manage to push it down it opens the throttle up and its stuck there. eventually after its been idling for a hour or 2 it will heat up enough to free it up. every day this seems to be getting worse. i have tried gas line antifreeze and no luck. any suggestions? this has been very dangerous to drive especially on icy roads

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Old 02-08-2008, 06:15 PM
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The problem is lack of heat to the throttle body. This is why the factory breather used the stove pipe ran to the air cleaner from the exhaust manifold, the vacuum switch would activate the flap in the air cleaner so it would only pull air from the stove pipe until the engine reached operating temp. If this system is removed especially in the temps you live in it'll freeze. The high velocity at idle causes the humidity in the air to freeze and stick to the butterflies.
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Old 02-08-2008, 07:15 PM
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Thanks! i will pick up a new hose tommarow, it has never had one on it since i have owned it. hopefully the vacuum switch still works.
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Old 02-08-2008, 09:18 PM
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So much for "cold air induction"!! LOL Contrary to what some folks say, those "factory guys" do know a thing or two.
How cold is it there? Must be humid too?


Mark
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Old 02-08-2008, 09:35 PM
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Had something similar happen to me with a Toyota, I sprayed the linkage with some penetrating oil (said that didn't freeze..) It worked for me.
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Old 02-08-2008, 11:31 PM
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well tomorrow morning it is supposed to be -49 Celsius with the windchill, That is -32 Fahrenheit. but it will freeze up anytime its below -15 to -20 Celsius. currently its 68% humidity
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Old 02-09-2008, 07:16 AM
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Quote:
Originally Posted by montea
well tomorrow morning it is supposed to be -49 Celsius with the windchill, That is -32 Fahrenheit. but it will freeze up anytime its below -15 to -20 Celsius. currently its 68% humidity
Oh my gosh!!

And I thought it was cold here when it hit 40!!!! LOL I feel sorry for ya at those temps. Heck, I would freeze over too in that weather.

Mark
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