carb
Thread Starter
Pro
Joined: Mar 2001
Posts: 577
Likes: 26
From: st george utah
2021 C5 of the Year Finalist - Unmodified
carb
OK i just failed emissions so need to rebuild carb so what is the big deal
well the throttle shaft warn in to the carb body so since its date coded
what to do thank you paul
i do know i should get a new carb but i am a ncrs extremest
all so so i don't spell or punctuate well
well the throttle shaft warn in to the carb body so since its date coded
what to do thank you paul
i do know i should get a new carb but i am a ncrs extremest
all so so i don't spell or punctuate well
Melting Slicks
Joined: Apr 2007
Posts: 3,189
Likes: 111
From: Tolland CT
OK i just failed emissions so need to rebuild carb so what is the big deal
well the throttle shaft warn in to the carb body so since its date coded
what to do thank you paul
i do know i should get a new carb but i am a ncrs extremest
all so so i don't spell or punctuate well
well the throttle shaft warn in to the carb body so since its date coded
what to do thank you paul
i do know i should get a new carb but i am a ncrs extremest
all so so i don't spell or punctuate well
You could ask Lars as well. I don't know if he goes that far with his rebuilds nor does he do many rebuilds for others lately.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,114
From: Crossville TN
Rebuilding the carb is not [necessarily] required when an emissions test is failed. Nor is it assured that rebuilding it will, in any way, improve the results. What is needed are the data on the emissions test sheet that shows the specifications for the failed test(s) and the testing conditions. For example, was the failed test performed at idle or at elevated speed? Was the failure for CO (carbon monoxide) or NO2 (nitrous oxide)? The repairs or adjustments required depend on what test was failed. Supply specific info and maybe we can help.
Safety Car
Joined: Jul 2005
Posts: 3,687
Likes: 833
From: WI
The throttle shaft wear is pretty common after many miles. Air gets drawn past the shaft and it reduces fuel atomization apparently. It could be one reason it's running rich (if that was the problem). You could have new bushings installed, or, you might try a re-builder. They will rebuild your existing carb. Here are a couple names:
http://www.quadrajetcarburetors.com/...g-service.html
http://www.carbrebuilders.com/index.htm
I have not use either. It's funny you bring up this topic. I just had my carb off my car today. I was going to disassemble it and get a bunch of parts replated. But what I might do is wait and send it in for rebuilding next year. I checked throttle shaft play and fortunately it's good. My other car DOES have some play. You should see some performance improvements as well once you get it corrected. The other common problem is a warped top.
Mark G
http://www.quadrajetcarburetors.com/...g-service.html
http://www.carbrebuilders.com/index.htm
I have not use either. It's funny you bring up this topic. I just had my carb off my car today. I was going to disassemble it and get a bunch of parts replated. But what I might do is wait and send it in for rebuilding next year. I checked throttle shaft play and fortunately it's good. My other car DOES have some play. You should see some performance improvements as well once you get it corrected. The other common problem is a warped top.
Mark G
Melting Slicks
Joined: Jun 2009
Posts: 2,709
Likes: 3
From: Savannah GA
A more common cause for emission test failure is baseline tune-up. A bad rotor and cap, a leaky spark plug wire, a couple plugs with .080 gap, maladjusted timing or a vacuum leak not related to throttle shaft wear are all more likely to cause the misfire which probably failed your car. A very wise mentor of mine told me long ago before the advent of "commonplace" fuel injection that it is impossible to correctly diagnose a carburetion problem in a car which needs any part of a basic ignition tune up. Years of sometimes chasing my own tail have taught me that he was absolutely correct. Verify the condition of your ignition, make sure your fuel and air filters are clean and that the PCV and EGR systems are functional before you tear your carb down.
Thread Starter
Pro
Joined: Mar 2001
Posts: 577
Likes: 26
From: st george utah
2021 C5 of the Year Finalist - Unmodified
thank you, the test only failed at low idle the float is leaking at needle vavle
also every thing has been replaced like sp cap and wires that i replaced 2000. miles ago . the car had stabil in it and only drove in two years 225. miles so befor test changed sp and rotor cap drain out old gas filled with chevron and put a can of sea foam in it did run better so with float leaking and warn throttle shaft i through rebuild in order and the fact it has not been done in over 24 years
also every thing has been replaced like sp cap and wires that i replaced 2000. miles ago . the car had stabil in it and only drove in two years 225. miles so befor test changed sp and rotor cap drain out old gas filled with chevron and put a can of sea foam in it did run better so with float leaking and warn throttle shaft i through rebuild in order and the fact it has not been done in over 24 years
Safety Car
Joined: Sep 1999
Posts: 4,930
Likes: 11
From: AnyTown NJ
St. Jude Donor '08-'09-'10-'11-'12-'13-'14-'15
It's been my experience this shop does very good work....my carb from them was a bolt on with minor adjustments.
http://customrebuiltcarbs.com/index.shtml
http://customrebuiltcarbs.com/index.shtml
Safety Car
Joined: Sep 2005
Posts: 4,057
Likes: 99
From: Southeast, Tennessee
St. Jude Donor '09 thru '26
OK i just failed emissions so need to rebuild carb so what is the big deal
well the throttle shaft warn in to the carb body so since its date coded
what to do thank you paul
i do know i should get a new carb but i am a ncrs extremest
all so so i don't spell or punctuate well
well the throttle shaft warn in to the carb body so since its date coded
what to do thank you paul
i do know i should get a new carb but i am a ncrs extremest
all so so i don't spell or punctuate well
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Corvette Engines RANKED by Peak Torque (70+ Years of Muscle!)
Joe Kucinski
Corvette ZR1X Will Be Pacing the Indy 500, And Could Probably Race, Too!
Verdad Gallardo
Top 10 Corvettes Coming to Mecum Indy 2026!
Brett Foote
Top 10 C9 Corvette MUST-HAVES to Fix These C8 Generation Flaws!
Michael S. Palmer
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
Le Mans Master
Joined: Mar 2008
Posts: 5,948
Likes: 72
From: Oxford MA-----You just lost the game!!!!
I am pretty sure you can bore out the throttle shaft and install brass bushings and i don't think they are visible once the carb is reassembled also your spelling isn't too bad but some punctuation once in awhile might make it easier for people who are reading your post to get the meaning you are trying to get across it makes me think of what it would look like if a dog learned to type also a reputable carb rebuilder who is familiar with ncrs standards will be able to rebuild your carb so it will work and look exactly like new and so it will work well and ncrs judges will not have a problem with it also make sure that you give instructions to rebuilder orally not in writing or misunderstanding may result hope this has been helpful see ya!
Scott
Scott
Safety Car
Joined: Sep 2005
Posts: 4,057
Likes: 99
From: Southeast, Tennessee
St. Jude Donor '09 thru '26