258/Carter Hose Routing - JeepForum.com
Search  
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 JeepForum.com > Models > Jeep CJ Forum > 258/Carter Hose Routing

BLACK FRIDAY SPECIALS!! You asked, we deliver!Engo winches available at www.rockridge4wd.com! Free shippANOTHER Rockridge4wd Creation!! Spare Tire Carrier Delete

Reply
Unread 05-03-2013, 01:57 PM   #1
FallibleXJ
Registered User
1974 CJ5 
 
Join Date: Apr 2009
Location: NY
Posts: 35
258/Carter Hose Routing

Hey All,

My CJ has been running very rich recently, and I finally had had enough of it and wanted to see what I could do to fix it. I was told that vacuum leaks would be the likely culprit, so I decided to start there (carb was rebuilt a year or so ago). While looking through threads and website at pictures of where the lines are supposed to run, it almost looks like mine is backwards... can someone confirm this? The hoses Im concerned about are the two coming off of the valve cover. One is going to the air filter housing and the other into the base of the carb. All of the sites I looked at, the front one is for the PCV valve and runs to the base of the carb, the rear one goes into the air cleaner. Is there something wrong with mine being seemingly backwards?









FallibleXJ is offline   Reply With Quote Quick reply to this message
Unread 05-03-2013, 02:08 PM   #2
Matt1981CJ7
Web Wheeler
 
Matt1981CJ7's Avatar
1981 CJ7 
 
Join Date: May 2011
Location: Elbert, CO
Posts: 10,694
It'll work in either configuration.

Matt
Matt1981CJ7 is offline   Reply With Quote Quick reply to this message
Unread 05-03-2013, 07:25 PM   #3
86cj74.2L
Web Wheeler
 
86cj74.2L's Avatar
2004 WJ 
 
Join Date: Jul 2006
Location: Stouchsburg, PA
Posts: 6,989
You should make sure your needle assembly is installed and set correctly. Its fairly easy.

Take the cover off the front top of carb and notice the round barrel with two needles. It's the center plastic arm.

Then back out your idle adjustment screw all the way Untill the throttle plates are completely closed and the screw isn't touching anymore.

Once this is done then loosen the screw on the shaft that operated the needle assembly and press down on it till it bottoms out. (You will be compressing a spring) then retighten the screw on the shaft. If you moved that arm any amount you just leaned out everything but idle and wide open throttle.

Then put your idle screw back where it was.

Also it would not hurt setting your fuel screws for lean best idle again. Make sure your idle is around 700rpm to do this. You don't want a high idle to set this.
86cj74.2L is offline   Reply With Quote Quick reply to this message
Unread 05-04-2013, 07:29 AM   #4
FallibleXJ
Registered User
1974 CJ5 
 
Join Date: Apr 2009
Location: NY
Posts: 35
Quote:
Originally Posted by 86cj74.2L View Post
You should make sure your needle assembly is installed and set correctly. Its fairly easy.

Take the cover off the front top of carb and notice the round barrel with two needles. It's the center plastic arm.

Then back out your idle adjustment screw all the way Untill the throttle plates are completely closed and the screw isn't touching anymore.

Once this is done then loosen the screw on the shaft that operated the needle assembly and press down on it till it bottoms out. (You will be compressing a spring) then retighten the screw on the shaft. If you moved that arm any amount you just leaned out everything but idle and wide open throttle.

Then put your idle screw back where it was.

Also it would not hurt setting your fuel screws for lean best idle again. Make sure your idle is around 700rpm to do this. You don't want a high idle to set this.
Any chance you could send me a photo of what needles you're referring to?
FallibleXJ is offline   Reply With Quote Quick reply to this message
Unread 05-04-2013, 03:15 PM   #5
86cj74.2L
Web Wheeler
 
86cj74.2L's Avatar
2004 WJ 
 
Join Date: Jul 2006
Location: Stouchsburg, PA
Posts: 6,989
In this picture I have the cover removed and am pointing to the screw and arm that operate the needle assembly.
image-1799467523.jpg  
86cj74.2L is offline   Reply With Quote Quick reply to this message
Unread 05-04-2013, 03:16 PM   #6
86cj74.2L
Web Wheeler
 
86cj74.2L's Avatar
2004 WJ 
 
Join Date: Jul 2006
Location: Stouchsburg, PA
Posts: 6,989
In this picture I'm pointing to the actual needle assembly. You can push down on the Allen screw area.
image-620992855.jpg  
86cj74.2L is offline   Reply With Quote Quick reply to this message
Unread 05-04-2013, 03:24 PM   #7
INowUnderstand
Registered User
1986 CJ7 
 
Join Date: Dec 2012
Location: San Angelo, Texas
Posts: 226
Someone correct me if I'm wrong, but if you have vacuum leak it is letting more air in and causing it to run lean instead of rich. I had some bad leaks recently and adjusting the idle mix screws out allowed the engine to at least run at idle. If you don't know take some time to learn the vacuum layout and difference between ported and manifold vacuum. Plenty of info to search here. For setups, Plus google adventures under the hood. Has a bunch of good info. taking pictures and asking questions good to. It really helps to understand all this

Sent from my iPhone using JeepForum
INowUnderstand is offline   Reply With Quote Quick reply to this message
Unread 05-04-2013, 04:34 PM   #8
86cj74.2L
Web Wheeler
 
86cj74.2L's Avatar
2004 WJ 
 
Join Date: Jul 2006
Location: Stouchsburg, PA
Posts: 6,989
The carter BBD has its needle assembly inside a vacuum chamber ported to manifold vacuum. As long as proper vacuum is present the vacuum pulls on the barrel the needles are mounted to which compresses a spring and pulls the needles deeper into the main jets.

Loss of vacuum, be it from leaks, poor tuning, or simply getting on the gas will cause the springs to bush back on the needles which raises them around 3/16 inch higher richening up the part throttle fuel metering.

Edit. Holley and motorcraft carbs do the same thing but use a power valve.
86cj74.2L is offline   Reply With Quote Quick reply to this message
Unread 05-04-2013, 05:23 PM   #9
INowUnderstand
Registered User
1986 CJ7 
 
Join Date: Dec 2012
Location: San Angelo, Texas
Posts: 226
ok, so I would guess a leak would make it rich to a point, more serve leak might cause it to start to lean back out?
INowUnderstand is offline   Reply With Quote Quick reply to this message
Unread 05-05-2013, 01:06 PM   #10
FallibleXJ
Registered User
1974 CJ5 
 
Join Date: Apr 2009
Location: NY
Posts: 35
Appears I have a Carter YF, not a BBD.
FallibleXJ is offline   Reply With Quote Quick reply to this message
Unread 05-05-2013, 01:20 PM   #11
John Strenk
Moderator
 
John Strenk's Avatar
1976 CJ5 
 
Join Date: Feb 2005
Location: Shalersville Ohio
Posts: 13,174
The YF operates on the same principle as the BBD. A leak will cause the needle to rise causing it to run rich.

Sent from my iPhone using JeepForum
John Strenk is online now   Reply With Quote Quick reply to this message
Unread 05-05-2013, 04:03 PM   #12
FallibleXJ
Registered User
1974 CJ5 
 
Join Date: Apr 2009
Location: NY
Posts: 35
Quote:
Originally Posted by John Strenk View Post
The YF operates on the same principle as the BBD. A leak will cause the needle to rise causing it to run rich.

Sent from my iPhone using JeepForum
Okay thanks, I just got 'done' fixing the ghetto hoses for those two lines... Decided to swap the grommets while I was at it, one of which broke and fell into the valve cover... which added another hour to my project. But I'll see what it looks like tomorrow once its all set up. Thanks guys
FallibleXJ is offline   Reply With Quote Quick reply to this message
Reply

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user 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 e-mail address for yourself.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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.


Thread Tools






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