Divorced choke question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

cranky84 · 02-21-2014, 06:12 PM

I've been trying to fix the idle on my truck for awhile now and can't seem to get it. It's a 327 with a 2 barrel qjet. I replaced the coil spring. Thought that was the problem but it wasn't. When I start the truck It seems fine but when the truck warms up and I push on the throttle it idles really high and the butterfly is stuck ., I can move it back manually under the good. Any one have a my suggestions on what Is wrong?

stomper · 02-21-2014, 06:46 PM

Has the carb been apart lately? The choke linkage and such is a real puzzle that has to be assembled correctly.

cranky84 · 02-21-2014, 07:19 PM

I have not taken it off. I just bought it tho so I don't know. I ordered a choke pull off , will that maybe work? A guy at my work said it is the exhaust crossover under the intake. But it seems like the coil spring is getting hot so I can't see it being that...

geezer#99 · 02-21-2014, 07:29 PM

THey don't make 2bbl qjet. They do make a dualjet that looks like a qjet. Or do you mean a rochestor 2gc.
Choke pull off won't help. Yours is working already or it wouldn't run.
Maybe take a pic of your carb.

68gmsee · 02-21-2014, 07:54 PM

If the linkages are not binding somewhere, try moving the throttle by hand slowly while looking into the throttle body to see if the butterflies are sticking. It may be gummed up or could be a throttle body butterfly shaft that has a flat spot. Try cleaning first and see what happens.

I had one that no amount of cleaning and spraying kept it from sticking. I even put a stronger spring on it but wound up putting another carb on the engine. If that is your problem, you can have a carburetor shop, repair shop or even a machine shop install shims in it. I'm in the process of trying to find a shop that will do my monojet. May have to bite the bullet and get a shim kit.

cranky84 · 02-21-2014, 08:01 PM

Sorry I think it is a Rochester. I don't know what it is called but on the other side of the carb where the choke connects to looks like a ratcheting system with a screw on it, and if it's supposed to ratchet it's not. I can move it back myself but won't when I'm driving it. It idles high when at a stop light. Name: image.jpg
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Name: image.jpg
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geezer#99 · 02-21-2014, 08:15 PM

It's a rochestor 2gc.
You can bend that long rod a bit to make it kick off the high idle.
The high idle screw is the same as the low idle screw. Located on the other side of the carb. Rides on the cam. You call it the ratchet thing.
Take a pic of the other side.
THere's another link on the other side that's attached to the choke.

cranky84 · 02-21-2014, 10:15 PM

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. I looked at the old coil and the spring was on the other way than the old one. So I switched it and seems like it fixed it. Before it was when it was heating up the choke would go up so it would idle high. So I switch the coil so when it heats up the spring goes down so the idle goes down too. Kinda weird that that's how it came in the box, wrong

02-21-2014, 06:12 PM	#1
cranky84 Registered User Join Date: Apr 2012 Location: minneapolis, minnesota Posts: 21	Divorced choke question I've been trying to fix the idle on my truck for awhile now and can't seem to get it. It's a 327 with a 2 barrel qjet. I replaced the coil spring. Thought that was the problem but it wasn't. When I start the truck It seems fine but when the truck warms up and I push on the throttle it idles really high and the butterfly is stuck ., I can move it back manually under the good. Any one have a my suggestions on what Is wrong?

02-21-2014, 06:46 PM	#2
stomper Junior Member Join Date: Jul 2002 Location: Scottsdale, AZ Posts: 1,701	Re: Divorced choke question Has the carb been apart lately? The choke linkage and such is a real puzzle that has to be assembled correctly. __________________ "I was patina when patina wasn't cool." 1973 Cheyenne SWB Sunset Gold / Frost White / Saddle

02-21-2014, 07:19 PM	#3
cranky84 Registered User Join Date: Apr 2012 Location: minneapolis, minnesota Posts: 21	Re: Divorced choke question I have not taken it off. I just bought it tho so I don't know. I ordered a choke pull off , will that maybe work? A guy at my work said it is the exhaust crossover under the intake. But it seems like the coil spring is getting hot so I can't see it being that...

02-21-2014, 07:29 PM	#4
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,751	Re: Divorced choke question THey don't make 2bbl qjet. They do make a dualjet that looks like a qjet. Or do you mean a rochestor 2gc. Choke pull off won't help. Yours is working already or it wouldn't run. Maybe take a pic of your carb.

02-21-2014, 07:54 PM	#5
68gmsee Active Member Join Date: Jul 2007 Location: Centrally located between Houston, Austin and Waco. BCS area. Posts: 7,947	Re: Divorced choke question If the linkages are not binding somewhere, try moving the throttle by hand slowly while looking into the throttle body to see if the butterflies are sticking. It may be gummed up or could be a throttle body butterfly shaft that has a flat spot. Try cleaning first and see what happens. I had one that no amount of cleaning and spraying kept it from sticking. I even put a stronger spring on it but wound up putting another carb on the engine. If that is your problem, you can have a carburetor shop, repair shop or even a machine shop install shims in it. I'm in the process of trying to find a shop that will do my monojet. May have to bite the bullet and get a shim kit. __________________ 68 GMC 250/3 speed Saginaw p/b p/s 69 Chevy 350/350 currently in pieces still lookin for a cab 06 Trailblazer I just want a vehicle that I can work on, that won't talk to me, leave error msgs or keep track of how I drive...

02-21-2014, 08:01 PM	#6
cranky84 Registered User Join Date: Apr 2012 Location: minneapolis, minnesota Posts: 21	Re: Divorced choke question Sorry I think it is a Rochester. I don't know what it is called but on the other side of the carb where the choke connects to looks like a ratcheting system with a screw on it, and if it's supposed to ratchet it's not. I can move it back myself but won't when I'm driving it. It idles high when at a stop light.

02-21-2014, 08:15 PM	#7
geezer#99 Registered User Join Date: Aug 2009 Location: Bowser Posts: 13,751	Re: Divorced choke question It's a rochestor 2gc. You can bend that long rod a bit to make it kick off the high idle. The high idle screw is the same as the low idle screw. Located on the other side of the carb. Rides on the cam. You call it the ratchet thing. Take a pic of the other side. THere's another link on the other side that's attached to the choke.

02-21-2014, 10:15 PM	#8
cranky84 Registered User Join Date: Apr 2012 Location: minneapolis, minnesota Posts: 21	Re: Divorced choke question . I looked at the old coil and the spring was on the other way than the old one. So I switched it and seems like it fixed it. Before it was when it was heating up the choke would go up so it would idle high. So I switch the coil so when it heats up the spring goes down so the idle goes down too. Kinda weird that that's how it came in the box, wrong



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