82 Crossfire Throttle Bodies
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 5,104
Likes: 1,362
From: New York New York
2024 C1 of the Year Finalist - Unmodified
2024 C2 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C1 of the Year Finalist - Unmodified
82 Crossfire Throttle Bodies
My wife has an 82 Collector's edition that idles high and has a misfire at idle. I have completly tuned the engine, new valve seals, adjusted the rockers, checked for vacuum leaks, changed the idle air motors, had the engine on an oscilliscope and found no other obvious problems.
here is a link to the valve seal install that I wrote.
http://temp.corvetteforum.net/classi...-Install.shtml
I was told that the throttle body shafts bores wear and can cause this problem.
Anyone use this guys units and how was the results?
Thanks, Joe
http://cgi.ebay.com/ebaymotors/Cross...em250208948097
here is a link to the valve seal install that I wrote.
http://temp.corvetteforum.net/classi...-Install.shtml
I was told that the throttle body shafts bores wear and can cause this problem.
Anyone use this guys units and how was the results?
Thanks, Joe
http://cgi.ebay.com/ebaymotors/Cross...em250208948097
Racer
Joined: Dec 2005
Posts: 474
Likes: 127
From: Stafford Virginia
Don't buy them, I did and they now sit on a bin somewhere in the garage. Go to the DCS site...at work, don't have link...and those guys know how to do it right. You have to send them yours as they don't stock sets but at least you know you're getting your originals back. They also have the fuel pressure gauge setup, pressure adjust tool, and a lot of helpful information.
I did the same thing...tune up, scope, injectors, IACs, etc., and none of it fixed my idle and popping. The other key is you can actually balance the factory bodies much easier because the small ports remain intact.
Get the bodies overhauled by them, make sure you have enough fuel pressure...I didn't...and you'll be fine. My 82 runs great and I was ready to do a TPI swap and pitch the CFI.
I did the same thing...tune up, scope, injectors, IACs, etc., and none of it fixed my idle and popping. The other key is you can actually balance the factory bodies much easier because the small ports remain intact.
Get the bodies overhauled by them, make sure you have enough fuel pressure...I didn't...and you'll be fine. My 82 runs great and I was ready to do a TPI swap and pitch the CFI.
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
Team Owner
Joined: Sep 2003
Posts: 88,393
Likes: 2
From: eville in
Don't buy them, I did and they now sit on a bin somewhere in the garage. Go to the DCS site...at work, don't have link...and those guys know how to do it right. You have to send them yours as they don't stock sets but at least you know you're getting your originals back. They also have the fuel pressure gauge setup, pressure adjust tool, and a lot of helpful information.
I did the same thing...tune up, scope, injectors, IACs, etc., and none of it fixed my idle and popping. The other key is you can actually balance the factory bodies much easier because the small ports remain intact.
Get the bodies overhauled by them, make sure you have enough fuel pressure...I didn't...and you'll be fine. My 82 runs great and I was ready to do a TPI swap and pitch the CFI.
I did the same thing...tune up, scope, injectors, IACs, etc., and none of it fixed my idle and popping. The other key is you can actually balance the factory bodies much easier because the small ports remain intact.
Get the bodies overhauled by them, make sure you have enough fuel pressure...I didn't...and you'll be fine. My 82 runs great and I was ready to do a TPI swap and pitch the CFI.
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
Top 10 Most Expensive Corvettes Ever Sold on Bring A Trailer
Brett Foote
10 Things Every Corvette Owner Needs (2026 Edition)
Michael S. Palmer
8 Most "Only Corvette Owners Understand" Quirks and Problems
Pouria Savadkouei
10 Reasons the C6 Z06 is Still A Performance Benchmark After 20 Years
Joe Kucinski
How Much Horsepower Every Corvette Engine "LOST" in 1972
Joe Kucinski
Top 10 DOs and DON'Ts for Protecting Your Convertible Top!
Michael S. Palmer
Top 10 Most Explosive Corvettes Ever Made: Power-to-Weight Ratio Ranked!
Joe Kucinski
150 hp to 1,250 hp: Every Corvette Generation Compared by the Specs That Matter
Joe Kucinski
8 Coolest Corvette Pace Cars (and Replicas) of All Time
Verdad Gallardo
Pro
Joined: Oct 2006
Posts: 594
Likes: 3
From: Peoria IL
My Tb's are with DCS being overhauled right now , They are a great bunch of guys , really helpful and knowledgeable. They will set you straight.Check out http://www.crossfire.homeip.net/cftest/default.asp The crossfire injection vault and look for members Buccaneer and Elkabong , they run DCS and will answer any questions you have of their services .
I can't wait to get mine back and fitted to feel the difference and from the number of happy customers I have heard from through the Xfire forum , I will not be dissapointed.
Safety Car
Joined: Mar 2007
Posts: 3,652
Likes: 49
From: Bridgewater nj
My Tb's are with DCS being overhauled right now , They are a great bunch of guys , really helpful and knowledgeable. They will set you straight.Check out http://www.crossfire.homeip.net/cftest/default.asp The crossfire injection vault and look for members Buccaneer and Elkabong , they run DCS and will answer any questions you have of their services .
I can't wait to get mine back and fitted to feel the difference and from the number of happy customers I have heard from through the Xfire forum , I will not be dissapointed.
They know what there doing! BUT I don't see how a vac. leak is causing your popping and misfire? It should only cause a high idol. unless you have a bigger vac. leak than a worn throttle shaft.
Racer
Joined: Dec 2005
Posts: 474
Likes: 127
From: Stafford Virginia
I think for me it was a combination of correct fuel pressure and fixing the vac leak.
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 5,104
Likes: 1,362
From: New York New York
2024 C1 of the Year Finalist - Unmodified
2024 C2 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C1 of the Year Finalist - Unmodified
I had a scanner on it and there are no codes. When I first got the car the thermostat was stuck wide open so I thought I had it, but no! I replace the coolant sensor when I changed the stat.
I am fouling number 4 spark plug also.
I will check out there website.
Thanks,
Joe
I am fouling number 4 spark plug also.
I will check out there website.
Thanks,
Joe
Melting Slicks
Joined: Jul 2005
Posts: 2,740
Likes: 3
From: Aurora Ontario
I don't think the miss and high idle are related.
If you are fouling number 4 it could be a lifter, pushrod, or valve spring.Worse case scenario a cam lobe. It could also be the module in the distributor.
The high idle is a different storey. Lokk at your TBI's. have they been tampered with. The idle screw is set from the factory and is welded into postion. You need to grind the weld off and replace the screw to adjust the idle. Has the weld been removed. Secondly the ports to access the minimum air setting screws are factory capped. There is one on each TBI on the side facing the firewall. To adjust you need to pop the caps. Are the caps gone?
Jim
If you are fouling number 4 it could be a lifter, pushrod, or valve spring.Worse case scenario a cam lobe. It could also be the module in the distributor.
The high idle is a different storey. Lokk at your TBI's. have they been tampered with. The idle screw is set from the factory and is welded into postion. You need to grind the weld off and replace the screw to adjust the idle. Has the weld been removed. Secondly the ports to access the minimum air setting screws are factory capped. There is one on each TBI on the side facing the firewall. To adjust you need to pop the caps. Are the caps gone?
Jim
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
when i had a wet plug ,i had a bad cam lobe . check wire ,check plug .check cam .to check throttle shafts you can spray wd-40 [have used carb cleaner ]around the throttle shafts . if bad ,the rpm will go up and down .the rear tbi is the one that is generaly bad .
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 5,104
Likes: 1,362
From: New York New York
2024 C1 of the Year Finalist - Unmodified
2024 C2 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C1 of the Year Finalist - Unmodified
When I did the valve seals I checked compression, cam lobes, springs and replaced the wires and plugs.
I changed the coolant sensor and IAC motors.
Check out the valve seal replacement article on my site that I did.
http://temp.corvetteforum.net/classi...-Install.shtml
I changed the coolant sensor and IAC motors.
Check out the valve seal replacement article on my site that I did.
http://temp.corvetteforum.net/classi...-Install.shtml
Pro
Joined: Oct 2006
Posts: 594
Likes: 3
From: Peoria IL
I know you went over to the Xfire forum for help but there is all sorts of rattles getting thrown out of cribs there at the moment (must be PST - Pre superbowl tension!!) so not really a good time to get decent responses.
Did you contact the guys at DCS or check out there site ? There is a tech article on the site that shows how to check the TB Shafts for wear - its pretty simple.
I know that most seem to think there are other issues here than the TB's (and I do not have the knowledge to judge one way or the other ) but at least you can check and will know if they need attention when you have gotten to the bottom of the wet plug and other issues.
Did you contact the guys at DCS or check out there site ? There is a tech article on the site that shows how to check the TB Shafts for wear - its pretty simple.
I know that most seem to think there are other issues here than the TB's (and I do not have the knowledge to judge one way or the other ) but at least you can check and will know if they need attention when you have gotten to the bottom of the wet plug and other issues.
Thread Starter
Le Mans Master
Joined: Apr 2000
Posts: 5,104
Likes: 1,362
From: New York New York
2024 C1 of the Year Finalist - Unmodified
2024 C2 of the Year Finalist - Unmodified
2023 C2 of the Year Finalist - Unmodified
2023 C1 of the Year Finalist - Unmodified
I tried to find their web address but was unsuccesful.
Do you have their link?
Thanks, Joe
Do you have their link?
Thanks, Joe
Le Mans Master
Joined: Jul 2000
Posts: 6,664
Likes: 162
From: columbia city in
http://www.crossfire.homeip.net/cftest/ change the wet plug with a dry plug,see what you have .high idle sounds like a vac leak .the rear throttle body shaft is the first to go bad .with your hand can you move the shaft ?spray wd-40 or carb spay around the shaft see if rpm goes up or down
Last edited by terry82; Feb 4, 2008 at 12:15 AM.