Starting Idle Update - Is this normal for a vette
Thread Starter
Racer
Joined: Apr 2005
Posts: 365
Likes: 1
From: UK without vette :(
Starting Idle Update - Is this normal for a vette
Remove the air filter assembly to expose the carburetor. The choke is on the passenger side of the carburetor, is about 2" round and has 3 small screws holding the cover on the choke. If you look closely you will see small indicator marks on the cover. Loosen the 3 screws and rotate the cover to adjust the choke setting. This should be done with the motor cold. You may also have to move the throttle linkage slightly to allow the butterfly valve on top of the carburetor to operate. Adjust the choke until it just closes when the motor is cold, then start the car and check the operation of the choke. It should "pull off" easily when you tap on the gas and drop down to a normal idle well before 5 to 8 minutes of running. .
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Melting Slicks
Joined: Jun 2001
Posts: 2,266
Likes: 550
There is a passage way below the choke, heat crossover, that is probably carboned shut. Pull the intake and take it to a machine shop and have it boiled, clean, paint, reinstall. To check the choke setting. The choke plate should just barely shut at room temp if adjusted correctly. To check pull the throttle partway open to let the choke spring pull the choke plate shut. Then make sure the choke pull off holds vacuum and is not broken. With vacuum applied it should pull the choke plate open about an 3/16, to keep from over rich condition until the choke spring heats up and opens. 
Ron B.
Ron B.
Last edited by itsonlyairandfuel; Feb 8, 2006 at 12:40 AM.
Just another Corvette guy
Joined: Feb 1999
Posts: 8,518
Likes: 3,865
From: Palm Springs, CA.
I'd almost guarantee that your choke heat port is plugged and you're not getting enough heat to the bottom of that choke coil to pull it off. The top of your butterfly valve is black from too much fuel/choke so you're probably dumping fuel like crazy until you finally get enough heat after your 5-8 minute run time to drop the choke.
Pull the manifold. It's the only fix and it's not that hard to do.
Good luck
Thread Starter
Racer
Joined: Apr 2005
Posts: 365
Likes: 1
From: UK without vette :(
Well I will get to pulling it this weekend....I guess I will order a new intake manifold since the one on there looks pretty poor, or do the machine shop route. Thanks for the help.
Last edited by vabeachvette; Feb 8, 2006 at 07:30 AM.
Pro
Joined: Mar 2004
Posts: 686
Likes: 0
From: Southeast
Before you decide to replace it, is everything else on the car stock? If you're not looking to spend a lot of money, I would just get it redone. However, once you start modifying, you'll keep on and keep on and keep on. Right guys? 
Tech Contributor
Joined: Aug 1999
Posts: 14,382
Likes: 6,401
From: At my Bar drinking and wrenching in Lafayette Colorado
A blocked crossover or non-functioning riser will not cause the choke to not close.
For a step-by-step procedure on setting up the choke, drop me an e-mail request for my choke setup paper - it covers things not mentioned by Chilton's:
V8FastCars@msn.com
For a step-by-step procedure on setting up the choke, drop me an e-mail request for my choke setup paper - it covers things not mentioned by Chilton's:
V8FastCars@msn.com
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Racer
Joined: Oct 2005
Posts: 449
Likes: 0
From: Boulder CO
Originally Posted by Fubba
However, once you start modifying, you'll keep on and keep on and keep on. Right guys?
My master cylinder began to fail at the end of last year so I decided it needed to be replaced. *Since I was going to do that, then it made sense to upgrade the brakes with new rotors and Wilwood calipers.
*Well, since the rotors were going to be off the car, this would be a good time to replace the shocks.
*Hell, since I'm in it this far, then I might as well upgrade the suspension with a composite monospring.
*And, throw in a sway bar just for good measure.
Parts are accumulating in the garage (waiting for Precision Brakes to finally send me my brake kit) and I will start the project this week-end.