One Idle Mix Screw Not Working!!! - Hot Rod Forum : Hotrodders Bulletin Board -- 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
lost password?   |   register now

LinkBack Thread Tools
  #1 (permalink)  
Old 10-05-2012, 01:56 AM
GUITAR1989's Avatar
Guitars & Cars >8D
Last photo:
Join Date: Aug 2010
Location: California
Age: 28
Posts: 119
Wiki Edits: 0

Thanks: 1
Thanked 0 Times in 0 Posts
One Idle Mix Screw Not Working!!!

Hey guys Im having some trouble with my Edelbrock 1406 carb. My drivers side idle mixture screw has no effect. I checked the Edelbrock dvd and it says to spray compressed air into the idle mixture screw hole. My trucks actually up at my moms house at the moment so I havent had a chance to try and put air through the screw hole yet. Will compressed air unclog the circuit no matter where the debris is? or will it only push junk outta the little hole the mixture screw tip goes into?

Any tips or suggestions are welcome about cleaning it or checking for other possible problems. You probably know alot more than I do about carbs

-I dont think its a vac leak cause vac is stable at 15
-Ive done a good amount of searching for vacuum leaks and replaced vac componants
-floats are at correct lvl
-My plugs are also black and sooty isnt a vac leak suppose to lean out the engine so the plugs wouldnt be black right?
-only drivers side mixture screw has no effect the passenger side is working.

Thanks for reading guys

Reply With Quote Quick reply to this message
Sponsored Links
  #2 (permalink)  
Old 10-05-2012, 06:08 AM
Registered User
Last photo:
Join Date: Aug 2006
Location: Alexandria, VA
Posts: 1,989
Wiki Edits: 0

Thanks: 4
Thanked 108 Times in 104 Posts
It's easy to remove the screw and use one of the cans of compressed air to blow through it, but it might not remove debris that's really stuck. Its also easy to unscrew the jets to give it a good exit path, and then blow air through from that side also.

If you are running rich I would try another check also. Use a flashlight and a small mirror at an angle to look down into the carb while its running. If you see any evidence of raw fuel dribbling on one side, there is probably something plugging the venturi on that side and making it run rich. This obstruction (which might be something sucked in when you had the air cleaner off) reduces air flow and makes it run rich. It usually means you also have to raise the idle to keep it running.

Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 10-05-2012, 01:23 PM
RWENUTS's Avatar
Registered User
Last photo:
Join Date: Nov 2011
Location: Bowser, BC, Canada
Age: 65
Posts: 3,990
Wiki Edits: 0

Thanks: 246
Thanked 503 Times in 461 Posts
Hook your vacuum advance up to manifold vacuum, turn down your idle. You've uncovered the idle transition slot too much with a high idle. Runs rich cause you're starting to run on the power circuit.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply

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:
Please enter a password for your user account. Note that passwords are case-sensitive.
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:
Please select your insurance company (Optional)


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
Can't get Holley to idle down with screw shockers69 Engine 15 07-11-2010 12:09 AM
Edelbrock Idle Mix Screws reset position? greenmoonshine Engine 8 02-10-2009 01:48 AM
Holley Idle mixture screw help 4speed57 Engine 11 01-30-2009 01:30 PM
? re: idle mix adjustment on 2150 2V carb cboy Engine 6 07-19-2005 05:31 PM
Idle Mixture Screw Plugs kringold Engine 1 05-10-2005 04:07 PM

All times are GMT -6. The time now is 02:33 AM.

Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2017, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
Copyright 1999 - 2012. All Rights Reserved.