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#783641 09/25/2011 10:46 PM
Joined: Apr 2011
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Yesterday i decided i'd go and see how well my truck started in the cold, fired right up. One thing i noticed is that when i would "suddenly" step on the gas instead of ease on it, the motor would almost die. i repeated this a couple times and same thing over and over again. but then i tried it with the choke on a little bit and it stopped, wouldn't die, just revved. doesnt make a whole lot of sence to me... any thoughts about this?

Last edited by Josh_51GMC; 09/25/2011 10:48 PM.
Josh_51GMC #783644 09/25/2011 10:50 PM
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Old Chebbies are notoriously cold natured.


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53moneypit #783645 09/25/2011 10:56 PM
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Might be a vacuum leak, what you're describing are the symptoms that a leak will cause.


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LONGBOX55 #783652 09/25/2011 11:28 PM
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Does it continue this after the engine has warmed?


"It's just a phase. He'll grow out of it." Mama, 1964

1956 Chevy 1/2-ton 3100
1953 Chevy 6100 "The Yard dog"
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Cletis #783660 09/26/2011 12:38 AM
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I agree with 53moneypit. Mine does the same but once it warms up it idles and accelerates without stumble or attempted dying.


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People, This is why we have a choke.
I some times forget that we now have several generations of engine operators who didn't grow up with chokes.
The choke is not intended to be on or off but modulated according to the engine's needs while it warms up.
As the choke plate is moved toward closed it increases the vacuum signal in the carb venturi so more fuel is delivered into the airstream.And the right choke opening for a cold engine at part throttle will NOT be correct as the engine warms or the speed or load changes.
Automatic chokes are designed to sense the engines needs (more or less) and modulate the coke opening to suit--if all is well.
Learn to listen to your engine--it will tell you how to modulate the choke --and besides lighten up on that accelerator until you get some heat in the engine.
What did we say that "heat riser" valve and thermostat was good for??
The accelerator pump will let you start a cold engine without a choke if it works well but you sure won't like the "drivability"

Did anybody ever hear the term they used in the old days of a vehicle being "cold collared" or "cold natured".it meant you had to work a little harder to keep it running until warmup was well underway.

Last edited by enginenut; 09/26/2011 3:03 AM.

Bob Taylor
enginenut #783940 09/27/2011 1:18 AM
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So what Enginenut is saying is that this is normal?
i haven't had the truck running up to temp so i wouldn't know if this situation gows away or not

Josh_51GMC #783950 09/27/2011 1:40 AM
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You should read the owner's manual because it explains all this. If you had really cold weather it would not start without full choke. As it warms up you need less and less choke.


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Josh_51GMC #783953 09/27/2011 1:46 AM
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enginenut, wow.

I've lived with a manual choke for so long that it's just one of those "automatic" things I use when I start an old engine.

I guess if you only know a modern computer controlled fuel injected engine it might be very concerning how a cold engine runs on startup. LOL

Kurt


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