Quadrajet Throttle shaft seems to be binding - 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 02-18-2013, 07:35 PM
Registered User
 
Join Date: Aug 2006
Location: Alexandria, VA
Posts: 1,762
Wiki Edits: 0

Thanks: 4
Thanked 66 Times in 64 Posts
Quadrajet Throttle shaft seems to be binding

When I rebuilt my Quadrajet last year (its from an '86 GM truck) I put new bushings on the primary throttle shaft and lubricated it with lithium grease when I reassembled. Everything seemed to be moving okay until the weather got cold. Now when I let off the pedal slowly the throttle does not always come all the way back to the stop and it often sticks at about 1500-2000 RPM. If I let the throttle snap back quickly it will go all the way back to the stop. I already have the standard dual return spring setup on the Quadrajet.

Is there a better lubricant to use for the throttle shaft, and is it something I could spray in without pulling the throttle shaft out? Its not a simple job to pull out the throttle shaft to spray in the lubricant because I staked the screws that hold the plates on the shafts, but I could do that if I have to.

Thanks,

Bruce

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 02-18-2013, 08:45 PM
Bryan59EC's Avatar
Car? Truck? Who Cares
 

Last journal entry: First week of December
Last photo:
Join Date: Jun 2006
Location: San Antonio, Texas
Age: 54
Posts: 2,372
Wiki Edits: 0

Thanks: 2
Thanked 29 Times in 23 Posts
If you would have stayed here in San Antonio, you would not have that problem.
Can't say we have even had more than a day of winter here yet this year.

Think maybe the bushings are contracting just a bit in the cold???

Just a thought----it's nap time for me
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-19-2013, 12:04 PM
vinniekq2's Avatar
Registered User
 
Join Date: Jun 2012
Location: BC,Canada
Age: 56
Posts: 8,531
Wiki Edits: 0

Thanks: 353
Thanked 839 Times in 803 Posts
Have you tried water displacement 40 to see if it is a lubrication issue?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 02-19-2013, 04:11 PM
boothboy's Avatar
More bucks, go faster!
 
Last photo:
Join Date: Nov 2011
Location: Grass Valley, CA.
Posts: 621
Wiki Edits: 0

Thanks: 254
Thanked 323 Times in 287 Posts
You might want to look and see if any of the throttle plate are binding. I don't know how far you tore your carburetor down but if you removed the plates it's a place to look.

BB
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 02-19-2013, 08:46 PM
Registered User
 
Join Date: Aug 2006
Location: Alexandria, VA
Posts: 1,762
Wiki Edits: 0

Thanks: 4
Thanked 66 Times in 64 Posts
Bryan59EC - Weather is considerably colder here than in SA, and its definitely meant that I needed to do some retuning on the truck to make it run better when its cold.

boothboy - I had hoped to get the throttle shaft to loosen up without pulling the carb off, but you are right about checking the throttle plates. I remember when I reassembled everything that the tolerances are very close and it wouldn't take much to make it bind.

Thanks,

Bruce
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:
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
64 Chevy Impala throttle cable for quadrajet 64r1 Hotrodding Basics 10 02-22-2013 03:54 PM
screws snapped off in the secondary throttle shaft of my rochester quadrajet - HELP! JMSTOY Hotrodding Basics 3 03-24-2012 04:09 PM
More Quadrajet Stuff-- Question about polished throttle plate clicketyclack Engine 6 07-17-2010 06:23 AM
Quadrajet throttle bracket... rbomar Engine 2 08-30-2007 09:41 AM
Identifying Quadrajet Ports on throttle body... flipp121 Engine 11 05-19-2005 10:27 PM


All times are GMT -6. The time now is 01:25 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.