The problem is that the auto choke on my 1967 327/300 does not close the butterfly and there is consequently no high idle. I must keep the idle high when cold by using the accelerator until engine warms up. This problem just started at the beginning of the summer. Th 3810 carb is stock, never been monkeyed with or damaged and has not missed a beat in 20 years--until now.I replaced the choke coil with one from Zip Products and it is an exact match. It appears that the coil is not pushing up the choke linkage. In the past, the choke butterfly slammed shut no matter what the temp. and high idle was normal. All linkage is free. The choke butterfly just hangs loosely when the gas pedal is depressed. I can't believe that just because the ambient temp. is 85 degrees, the choke won't slam shut. I really don't want to have to adjust it as it worked fine in the past. I can see no earthly reason why this choke won't close! What do you reccommend??
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A time machine
I can't get the modern replacement GM choke coils to effectively close the butterfly on '66-7 Holley carbs either.
I think the specs on the modern part are different from the originals. -
Re: Auto Choke Problem-3810 Carb.
There are dealers for the 63 to 67 Impala clubs try them for a stock unit, you could have carbon build up in the intake canal under the coke area that would need to be removed.Comment
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Re: Auto Choke Problem-3810 Carb.
Roy, Thanks for the response. Maybe I don't get it, but how would carbon in the intake canal affect the mechanical operation of the choke? The choke heats up just fine once the engine has been running for a few minutes. It just seems that the bi-metallic spring is too weak to activate the choke butterfly when cold. Note that I had the original (36 years old) choke coil in when all this started and the new one acts the same.Any thoughts? Thanx!
P.S. anyone else out there with a fix, it's driving me nuts?Comment
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Re: Auto Choke Problem-3810 Carb.
if it is a push to close choke make a longer rod and if it is a pull to close choke make the rod shorterComment
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Re: Auto Choke Problem-3810 Carb.
You may have the wrong choke coil (to thick a spring) or the cover is rubbing on the choke rod.You could use a hair dryer on the coil to see if it will open all the way on both your's and the new one.Comment
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Re: Auto Choke Problem-3810 Carb.
Roy, the choke works fine when hot, butterfly is 100% open when hot, it's just when cold that butterfly wont't close.Comment
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Re: Auto Choke Problem-3810 Carb.
Clem, you know, I just might try this, it can't be any more weird than the problem I have now! Do they still make wire coathangers?Comment
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Re: Auto Choke Problem-3810 Carb.
some of the rods had a "dog leg" in them for just this purpose. also these rod came in differnt length,you may have the wrong rod. JMHOComment
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Re: Auto Choke Problem-3810 Carb.Don
If the choke works fine when hot and the butterfly is free and the choke rod is not hanging up and engine heat is un-winding the choke spring and the moon still comes out at night. All I can think of what's left is the carb linkage is not free to allows the choke rod to move a cam which in turn closes the butterfly.With the engine off pull the gas pedal rod back and hold it while on the right side of the carb move the high idal came up.?????????????? you got me!!!!!!!!Comment
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