Go Back   Third Generation F-Body Message Boards > Tech Boards > Carburetors
Sign in using an external account
Register Forgot Password?

Carburetors Carb discussion and questions. Upgrading your Third Gen's carburetor, swapping TBI to carburetor, or TPI to carburetor? Need LG4 or H.O. info? Post it here.

Welcome to ThirdGen.org!
Welcome to ThirdGen.org.

You are currently viewing our forum as a guest, which gives you limited access to view most discussions and access our other features. By joining our community, at no cost, you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is free, fast and simple, join the ThirdGen.org community today!


Reply
 
Thread Tools Search this Thread
Old 06-27-2002, 09:40 AM   #1
Member
 
Join Date: Nov 1999
Location: MI, USA
Posts: 237

Classifieds Rating: (0)
QuadraJet help

I rebuilt my quadrajet and now it runs even worse. It cuts out and booooogggs bad. I left off everything on the passangers side of the carb. I think I realize my problem now that I think about it. They dont call it vacuum secondary for nothing do they??? Right now the secondary is just running off the the AV door spring so I assume its just slamming open (boggg). How I setup up the vacuum secondary but keep the choke disabled and make sure that stupid secondary lockout thing doesnt get in the way of my secondaries.
mefreema is offline vBGarage Page   Reply With Quote
Old 06-27-2002, 12:40 PM   #2
Moderator
 
five7kid's Avatar
 
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 39,550
Car: 82 Berlinetta(2)/57 Bel Air
Engine: LS1 (LS1)/LQ4
Transmission: 4L60E (T56)/4L80E
Axle/Gears: 10B 3.73(9" 4.11)/8.2" 4.11

Classifieds Rating: (11)
The q-jet isn't called "vacuum secondary". It's mechanical with an "air valve".

You must have the vacuum pull-off along with the AV spring. The pull-off keeps the AV from being shocked open. The spring controls the opening with respect to flow. The two work together to avoid bog.

The way you "make sure that stupid secondary lockout thing doesnt get in the way of my secondaries" is to remove it. You can disable the choke itself either by adjusting the thermostat lean, or (what I used to do at the track) tie the high idle cam down with a twist tie.
__________________
See detail on my cars in My vBGarage

I'm a racing fool. Not necessarily in that order.
five7kid is offline vBGarage Page   Reply With Quote
Old 06-27-2002, 01:00 PM   #3
Member
 
Join Date: Nov 1999
Location: MI, USA
Posts: 237

Classifieds Rating: (0)
Ok I will put all that stuff back on minus the lockout and zip tie the choke open. Cant use it any because my Action + intake has no EGR/choke provisions or mabe I'll convert to manual. Would not having the "vacuum pull-off" make it stumble on the low end and make a real deep sucking sound on top end and not quite feel right "semi-bog" My idle is also fluctuating but calms down a little once warmed up.
mefreema is offline vBGarage Page   Reply With Quote
Old 06-27-2002, 03:17 PM   #4
Moderator
 
five7kid's Avatar
 
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 39,550
Car: 82 Berlinetta(2)/57 Bel Air
Engine: LS1 (LS1)/LQ4
Transmission: 4L60E (T56)/4L80E
Axle/Gears: 10B 3.73(9" 4.11)/8.2" 4.11

Classifieds Rating: (11)
Is this a stock computer controlled q-jet, or older style with hot air choke? If hot air choke, it can be converted to electric very easily. I did that on my '84 full size van.

I thought I was smarter than the engineers and took off the pull-off link to the AV on my Edelbrock 1901 q-jet on the '57, thinking I could let the secondaries come in quicker. The result was an initial stumble when nailed. If I tried to adjust the AV spring tension to eliminate the stumble, it wouldn't open fully under full power. By the time I figured this all out, I had lost that little link, and Edelbrock sent me the wrong one when I asked. End result was me giving up and putting on the Holley.

With a properly functioning choke, idle problems should be reduced.

Last edited by five7kid; 06-27-2002 at 05:41 PM.
five7kid is offline vBGarage Page   Reply With Quote
Old 06-27-2002, 03:56 PM   #5
Member
 
Join Date: Nov 1999
Location: MI, USA
Posts: 237

Classifieds Rating: (0)
It is an older style carb non-cc. How do I convert to electric? Is their any way to hook up the hot air choke with no manifold provisions. I think I have a choke assyembly off another carb that looks like a coiled up band of flat thin metal. Can I use that?
Thanks for all your help!
mefreema is offline vBGarage Page   Reply With Quote
Old 06-27-2002, 05:40 PM   #6
Moderator
 
five7kid's Avatar
 
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 39,550
Car: 82 Berlinetta(2)/57 Bel Air
Engine: LS1 (LS1)/LQ4
Transmission: 4L60E (T56)/4L80E
Axle/Gears: 10B 3.73(9" 4.11)/8.2" 4.11

Classifieds Rating: (11)
It's pretty simple to convert, actually. The thermostat housings are the same size, and the bi-metal coil attaches in the same way. And, no, there isn't a good way to make a hot-air style work without the proper manifold.

You need to plug the tube on the front of the housing body (it pulls a small vacuum, which will be an air leak if you don't plug it). Install the electric thermostat, hook 12v ignition-switch power to it (the car originally had that wire).

Presto, you're done!
five7kid is offline vBGarage Page   Reply With Quote
Old 06-27-2002, 05:40 PM
ThirdGen
1992 Camaro




Paid Advertisement


Reply

Go Back   Third Generation F-Body Message Boards > Tech Boards > Carburetors

Tags
1901, bogs, carb, carburetor, choke, convert, edelbrock, electric, hook, lockout, manual, open, power, putting, quadrajet, secondary
Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

 


1982 Camaro '82 || 1983 Camaro '83 || 1984 Camaro '84 || 1985 Camaro '85 || 1986 Camaro '86 || 1987 Camaro '87 || 1988 Camaro '88 || 1989 Camaro '89 || 1990 Camaro '90 || 1991 Camaro '91 || 1992 Camaro '92


All times are GMT -5. The time now is 04:06 AM.


Powered by vBulletin® Version 3.7.5
Copyright ©2000 - 2012, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.5.2
All content copyright © 1997 - 2012 ThirdGen.org. All rights reserved. No part of this website may be reproduced without the expressed, documented, and written consent of ThirdGen.org's Administrators.

Emails & Contact Details