81 Corvette poor idle

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May 25, 2019 | 07:12 PM

Tim81

Thread Starter

Burning Brakes

Joined: Aug 2006

Posts: 1,058

Likes: 27

From: Eastern North Carolina

81 Corvette poor idle

This is a completely refurbished carburetor that runs great but has a very rough idle. The Carb is set to factory specs and the computer is not pulling any codes. The Dwell is floating right around 30 degrees. One thing I noticed is when adjusting the mixture screws the screw on the driver side does not have any effect on the idle. I can screw it all the way in and nothing changes. Any thoughts would be greatly appreciated.

May 26, 2019 | 02:02 AM

Antz81

Pro

Joined: Jun 2016

Posts: 567

Likes: 82

From: Auckland

Quote:

Originally Posted by Tim81

Have you checked to make sure your timing is correct? is the timing mark on your balancer still in the correct position? As Lars would say, "90% of carb problems are in the distributor"
Do you know when your timing chain was last checked?

May 26, 2019 | 07:59 AM

Tim81

Thread Starter

Burning Brakes

Joined: Aug 2006

Posts: 1,058

Likes: 27

From: Eastern North Carolina

The timing is set to where I get the best idle, the chain was replaced two years ago. The car had this problem since I have owned it 10+ years.

May 27, 2019 | 10:41 AM

MelWff

Race Director

Joined: May 2006

Posts: 18,736

Likes: 2,582

the fact that the mixture screw has no effect points to the carburetor only. You have a problem with the rebuilder, possibly a blocked passage, contact them

May 27, 2019 | 11:30 AM

7T1vette

Team Owner

Joined: Jan 2006

Posts: 37,637

Likes: 3,118

From: Crossville TN

What he said....

May 27, 2019 | 06:53 PM

Tim81

Thread Starter

Burning Brakes

Joined: Aug 2006

Posts: 1,058

Likes: 27

From: Eastern North Carolina

Thanks Gents, I rebuilt the carb so no one to blame but myself. I just ordered a professionally rebuilt carb, hopefully it will work.

May 28, 2019 | 07:22 PM

lars

Tech Contributor

Joined: Aug 1999

Posts: 14,380

Likes: 6,390

From: At my Bar drinking and wrenching in Lafayette Colorado

Be aware that "professionally rebuilt" carbs are assembly-line jobs done by 3rd-graders in Mexico... don't get your hopes up on a commercially rebuilt carb.

Lars

May 30, 2019 | 05:26 PM

Tim81

Thread Starter

Burning Brakes

Joined: Aug 2006

Posts: 1,058

Likes: 27

From: Eastern North Carolina

Lars, can you recommend someone who rebuilds e4me carburetors.

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May 30, 2019 | 05:39 PM

derekderek

Race Director

Joined: Jul 2015

Posts: 13,082

Likes: 3,399

From: SW Florida.

This guy named Lars is pretty good. But I feel all 81 electronic controlled carbs should be taken down to the river and float tested.

May 30, 2019 | 06:43 PM

#10

fake

Safety Car

Joined: Jan 2004

Posts: 4,549

Likes: 343

From: Glastonbury CT

Check or replace your vacumn hoses might be a quick fit. Try Doctor Rebuild out of Bridgeport Ct he sells all the hoses by the set and has nothing but quality pieces!

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