70 chevelle divorced choke position - Chevelle Tech
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post #1 of 10 (permalink) Old Jul 2nd, 18, 2:32 PM Thread Starter
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70 chevelle divorced choke position

Hello forum-
I recently had my carb rebuild by a reputable re-builder and I'm not sure how to set the choke. When the engine is cold the choke spring pressure wants to keep the choke plate fully open. It seems like the choke spring, specifically where it holds the actuating rod, is not in the correct position for a cold engine (see attached pic). Is the choke spring adjustable?
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post #2 of 10 (permalink) Old Jul 2nd, 18, 2:38 PM
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Re: 70 chevelle divorced choke position

Quote:
Originally Posted by neaswa View Post
Hello forum-
I'm not sure how to set the choke. When the engine is cold the choke spring pressure wants to keep the choke plate fully open.
You need to step on the gas pedal and let off completely to set the choke to closed. The choke is "tripped" by the pedal, so to speak.

You should also put a plug on that vacuum "pipe" coming out of the carb by the choke if you don't have something on it that was removed for the pic. Leaving it open creates a manifold vacuum leak.


This might help verify the choke. Posted this last week.


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post #3 of 10 (permalink) Old Jul 2nd, 18, 8:13 PM Thread Starter
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Re: 70 chevelle divorced choke position

Thanks Buzzbomb, I set the choke rod according to the video. The choke plate still stays full open after I step on and release the gas pedal. Any other suggestions?
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post #4 of 10 (permalink) Old Jul 2nd, 18, 10:01 PM
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Re: 70 chevelle divorced choke position

The spring might just be worn out and not constricting (when cold) enough to pull the choke plate down. I had this problem on my 69. A new one fixed that problem. Just a guess.


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post #5 of 10 (permalink) Old Jul 3rd, 18, 12:41 AM
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Re: 70 chevelle divorced choke position

>>> "Time treats everybody like a fool"

how true it is.

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post #6 of 10 (permalink) Old Jul 3rd, 18, 12:43 AM
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Re: 70 chevelle divorced choke position

be aware, the 6-cylinder spring looks the same but winds in the wrong direction when heated. Ignorant vendors sold these for V-8 parts for many years. decades?
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post #7 of 10 (permalink) Old Jul 3rd, 18, 12:48 AM
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Re: 70 chevelle divorced choke position

pull the little tin shield off, use a heat gun or lighter or whatever to heat the spring. see which way it turns.

These damn things are the main reason I avoid fiddling with the divorced choke style whenever I can.

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post #8 of 10 (permalink) Old Jul 3rd, 18, 9:27 AM
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Re: 70 chevelle divorced choke position

Was the choke working properly before you had the carb redone ? If so the spring should not be the problem.

Bill Koustenis
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Waldorf Md


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post #9 of 10 (permalink) Old Jul 3rd, 18, 3:13 PM Thread Starter
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Re: 70 chevelle divorced choke position

I don't think the choke was working correctly before the rebuild, but I didn't check it since there were other bigger issues with the carb which are now fixed with the rebuild. Anyway, I think I solved the problem. Apparently someone pigtailed the choke spring where the rod attaches in order to change the position of the rod or whatever reason. I straightened the spring with some pliers then tested its operation by putting it in the freezer then lightly hitting it with a torch. Also had to fabricate a slightly longer rod to accommodate a thicker carb gasket . Either way the choke appears to be working fine now. Thanks for all of your feeback.
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post #10 of 10 (permalink) Old Jul 3rd, 18, 8:16 PM
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Re: 70 chevelle divorced choke position

Thank for posting an update to the problem.
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