Help adjusting Carter carb -
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back > Models > Jeep Wrangler Forums > YJ Wrangler Technical Forum > Help adjusting Carter carb

Teraflex JK HD Hinged Carrier & Adjustable Spare Tire FREE, FREE, FREE EVENT!! Save big on Lockers now till Apri2007-2016 Jeep JKU 4" X-series suspension lift **dea

Unread 02-15-2013, 03:46 PM   #1
Registered User
1987 YJ Wrangler 
Join Date: Aug 2008
Location: Sandwich, IL
Posts: 2,759
Help adjusting Carter carb

Before anybody says "replace it with a Motorcraft or a Weber" my carb runs solid. I'm looking for some help in adjusting it. It's nuttered already, and I've had the idle adjusted. High idle is 1800 and low idle is between 600-700. The idles hold very nicely. What I'm looking for is how to adjust the air-fuel mixture. I have a bit of a fuel smell, so I know she's running rich.

Can someone help me out with an image of the carb and exactly what screws I should be adjusting?

I was told by a mechanic ---- adjust the air down to where the engine just about wants to stall (super lean), then bring it back to where it idles smoothly. I'm just not 100% certain of what screw to turn what direction.

Thanks in advance.

1996 White ZJ
1987 Maroon YJ (sideways build)
1996 Forest Green XJ

The "sideways" build thread:
Rproject is offline   Reply With Quote Quick reply to this message
Unread 02-15-2013, 05:27 PM   #2
Registered User
1990 YJ Wrangler 
Join Date: Nov 2012
Location: SLC, Utah
Posts: 54
I fiddled with mine quite a bit post-nutter to try and get the dang thing to pass emissions. There's two screws down by the mounting plate, one for each barrel that adjust the air fuel mixture. Problem is depends where you left the pins when you nuttered it as to how much adjustment you have. I gave up and put the Howell FI kit on mine.... drives like a whole new vehicle!
SLCSmoker is offline   Reply With Quote Quick reply to this message
Unread 02-15-2013, 07:33 PM   #3
Registered User
1990 CJ7 
Join Date: Nov 2008
Location: Ga
Posts: 5,145
Get a hold of a vacuum gauge. Adjust the 2 idle mixture screws to obtain max vacuum reading, then turh in 1/4 turn. Both screws should be within 1/2 turn of each other from bottomed out.

Check well for vacuum leaks at the base of the carb and intake manifold to head area(spray carb cleaner at suspect area, leak will cause idle speed change)
418 miles on 19 gallons of gas. Can't beat the BBD !
Old4X is offline   Reply With Quote Quick reply to this message
Unread 02-15-2013, 08:15 PM   #4
Registered User
1990 YJ Wrangler 
Join Date: Nov 2009
Location: The southern armpit of California
Posts: 2,098
You'll find the mixture screws on the throttle plate within square housings, facing to the front of the vehicle. If the Carter you have is factory and hasn't been messed with, then the idle screws (#64 at bottom of diagram) may still be plugged (by #62 in diagram). If so, you need to carefully drill out the plugs to get to the screws.

NonRubicon is offline   Reply With Quote Quick reply to this message

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user 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 e-mail address for yourself.

Email Address:


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.

Thread Tools

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. is not in any way associated with Jeep or the Chrysler Corp.