QudraJet Adjustment - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 06-13-2005, 08:08 PM
Theresa Shank's Avatar
Member
 
Join Date: Dec 2004
Location: Noblesville
Age: 71
Posts: 105
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
QudraJet Adjustment

We have a 350 SBC with a Quadrajet four barrel that is running rich. Tried to adjust idle screws but they are at base of housing and are odd shape, almost eliptical. Cannot find any screw driver or tool to fit into opening and on the adjustment screw. Any suggestions? ? THANKS. . . THERESA

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 06-13-2005, 08:41 PM
MI2600's Avatar
Member# 3287
 

Last journal entry: Vortec Heads
Last photo:
Join Date: Jul 2002
Location: N. Muskegon, MI
Posts: 2,632
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I inherited a Q-Jet adjustment tool made by K-D that has an interchangeable end for what I think you're talking about. I believe NAPA sells them. You might want to check there.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 06-13-2005, 09:26 PM
sbchevfreak's Avatar
Licenced Automotive Technician
 
Last photo:
Join Date: Feb 2004
Location: Land of big Easter eggs, Alberta
Age: 34
Posts: 1,604
Wiki Edits: 0

Thanks: 9
Thanked 9 Times in 9 Posts
Also on Q-jets, the upper air bleeds can get plugged and cause them to run rich.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 06-13-2005, 10:48 PM
New Member
 
Last photo:
Join Date: Jun 2004
Location: Nebraska
Posts: 24
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
They are pretty easy to get at, that is, if the factory sealant is removed. If you still have the factory sealant, I would leave the idle mixture screws alone and start looking elsewhere if it is indeed running rich. I once had a problem with the power piston not operating smoothly, causing the car to be un-drivable. Cleaning that out cleared that up right away.

If you do in fact need to adjust the idle mixture scews, www.chevyhiperformance.com did an excellent article on the proper procedure. I haven't tried it, but I also haven't needed to.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 06-13-2005, 11:43 PM
Jmark's Avatar
Registered User
 
Last photo:
Join Date: Sep 2003
Location: phoenix
Age: 61
Posts: 4,815
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
The later model Qjets have whats called a "double D" head on the screw. They are usually behind a metal plug that is pressed into the base plate once set at the factory when new. If you can now see the screw head, someone has already removed the caps and adjusted the mixture screws. Those carbs are inherantly lean no matter how far the mix screws our turned out. You may want to check the float and its setting. Some times the floats begin to sink and the fuel level raises and ends up dripping out the primary nozzles. This can be seen when the engine is idling and then look down the carb. If you see fuel dripping from the primary nozzles, its time for a rebuild and float replacement.

Here is pic of the carb tool. You can also take a piece of 3/16" brass hobby tubing and slowly pinch the end closed until it fits the screw.

Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 06-13-2005, 11:58 PM
Member
 
Last photo:
Join Date: May 2003
Location: Shreveport LA
Age: 64
Posts: 5,103
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Sometimes a short piece of vacuum tubing can be forced over the head of the screw & used to turn it.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may 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 On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Valve Lash adjustment hiball Engine 36 05-11-2009 10:12 AM
Carb float adjustment Steve-0321 Engine 1 05-14-2004 12:18 AM
Valve lash adjustment, Now I'm confused? Jag Daddy Engine 5 04-15-2004 11:27 PM
lifter adjustment Deadtemple Engine 1 09-20-2003 05:57 PM
4175 Holley Float Toe adjustment 7t7buckskin Engine 2 07-24-2003 07:52 PM


All times are GMT -6. The time now is 07:34 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.