Return springs were weakening over time - Chevelle Tech
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post #1 of 12 (permalink) Old Jun 10th, 19, 10:14 PM Thread Starter
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Return springs were weakening over time

Funny thing had apparently been happening over some period of time...Probably a couple of years. I noticed last week that when I let off the gas the car seemed to rev just a little higher than usual. When I got home, I checked the carb with the car idling, and noticed that I could close the throttle a little bit more by pushing it shut. I also noticed there was zero tension on the springs when the throttle was closed.

I shortened the 2 return springs by bending the ends and now the throttle closes all the way.

The idle had not been closing all the way and probably hadn't in a long time..... So much so, that I had to turn the idle speed screw over a half turn to get the idle back where it was! The springs were probably marginal to begin with and then weakened over time. Then I'm just obliviously tweaking the idle up to compensate over time.

The morale of the story is don't be like me. Check your throttle return springs once in a while!

72, SB 385, Voodoo roller, 219/227; .515/,530 lift; AFR 180cc Eliminators, RPM Air-Gap, 770 Avenger, 12 bolt 3.42's, Eaton Posi, Pypes 2 1/2" X-pipe system w/Race Pro's
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post #2 of 12 (permalink) Old Jun 11th, 19, 6:49 AM
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Re: Return springs were weakening over time

I would check the carburetor still. The return springs are there as a safety, and really shouldn't be depended on to pull it shut. The carburetor baseplate springs should pull the carburetor to idle. If it needs external force to pull it shut, something may still be binding.

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post #3 of 12 (permalink) Old Jun 11th, 19, 7:03 AM
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Re: Return springs were weakening over time

I have always had the best luck with the oem GM double spring. It is one spring inside another and they seem to last forever without losing their tension. Not sure if you can still get them from GM or not but they were on millions of cars and trucks with Q-jet carbs for years.

Bill Koustenis
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post #4 of 12 (permalink) Old Jun 12th, 19, 1:59 AM
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Re: Return springs were weakening over time

yeah, what Bill said. Another place where the stock stuff is best.

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post #5 of 12 (permalink) Old Jun 12th, 19, 11:35 AM
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Re: Return springs were weakening over time

the issue:

where to find a set of the stock double springs?

sign me up//

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post #6 of 12 (permalink) Old Jun 12th, 19, 12:17 PM
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Re: Return springs were weakening over time

Quote:
Originally Posted by robpp View Post
the issue:
where to find a set of the stock double springs?
sign me up//

GM 12337885 Still available from your local Chevy dealer

Bill Koustenis
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post #7 of 12 (permalink) Old Jun 12th, 19, 1:12 PM
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Re: Return springs were weakening over time

Not online they' aren't says "part discontinued" https://www.gmpartsdirect.com/?year=...&search_in=all

Needed something like that for the "new, modern Qjet" sitting atop a 600 hp rat.

You can buy a 10 pack here: https://www.gmpartsgiant.com/parts/g...-12337885.html

$1.85 a pop with the stiff shipping fee. Will let y'all know if they're the real deal.

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post #8 of 12 (permalink) Old Jun 12th, 19, 1:14 PM
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Re: Return springs were weakening over time

https://www.gmpartsgiant.com/parts/g...odel=&Filter=()


Either way if you "google" the number there are plenty of people selling them.
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Bill Koustenis
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post #9 of 12 (permalink) Old Jun 12th, 19, 1:22 PM
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Re: Return springs were weakening over time

Eating my garlic bagel during lunch ( yes , no appointments today), and I found the same Bill. I had to spend the $18 for a ten pack.

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post #10 of 12 (permalink) Old Jun 12th, 19, 1:28 PM
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Re: Return springs were weakening over time

$7.32 shipped....

https://www.ebay.com/itm/Genuine-GM-...xa8NQH&vxp=mtr

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post #11 of 12 (permalink) Old Jun 13th, 19, 12:59 PM
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Re: Return springs were weakening over time

are those the SETS?

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post #12 of 12 (permalink) Old Jun 15th, 19, 3:15 PM Thread Starter
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Re: Return springs were weakening over time

Quote:
Originally Posted by BillK View Post
I have always had the best luck with the oem GM double spring. It is one spring inside another and they seem to last forever without losing their tension. Not sure if you can still get them from GM or not but they were on millions of cars and trucks with Q-jet carbs for years.
I do have the double springs, but they were just ones from the local auto parts store in area the some would call the "tacky hot rod" section. Probably Spectre or Mr Gasket. They work good now that I shortened the ends. It caused a new problem though. See my new thread on my engine kicking at shutoff.

72, SB 385, Voodoo roller, 219/227; .515/,530 lift; AFR 180cc Eliminators, RPM Air-Gap, 770 Avenger, 12 bolt 3.42's, Eaton Posi, Pypes 2 1/2" X-pipe system w/Race Pro's
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