Newbie Vacuum Problems -
LinkBack Thread Tools
post #1 of 2 Old 01-07-2014, 07:28 PM Thread Starter
Registered User
1981 CJ7 
Join Date: Oct 2013
Location: Chicago
Posts: 16
Newbie Vacuum Problems

Hi everyone,

First post here, been on a few other boards as well.


Im having some serious frustrations with figuring out a rough idling / stalling problem.

Im running a 151 Iron Duke with a 2 barrel Rochester carb (e2se). I fired the engine up for the first time in a few months and it runs rough very rough and if I dont continually give it gas it will stall. I contacted the PO who informed me that after he had the carb rebuilt and installed it had vacuum problems but hes not a mechanic and his friend knew enough to plug a few lines to get it to start. He never drove it after the carb was installed and I bought it shortly thereafter.

I'm (very) new to working on these things and seeing SheetRock screws plugging some lines makes me uneasy, as does the charcoal canister not being hooked up.

So Ive decided to run the current setup by you guys and see if you can help me out. If possible Id like to hook the charcoal canister back up.

I labeled the picture here with some letters and numbers I hope you can follow:

In summary:
A is plugged
B comes from the fuel pump
C is plugged
I labeled the spindle looking thing X because I have no idea what it is. It has 4 hose outlets 2 on the top, 1 towards the front of the vehicle and 1 towards the rear of the vehicle. The 1s are connected to each other and the 2s are connected to each other.
Not sure what 3 is but the 3s are connected
D goes to something off of the distributor cap:

On the opposite side (the driver side) of the carb theres a rigid hose that goes to the valve cover. The PCV valve on the valve cover is connected to the air cleaner assembly.

I pulled the charcoal canister and after some scrubbing found the 3 ports are labeled (from L to R) PCV, Fuel Tank, Carb Bowl.

Sowhat do you think goes where? And what should I do with the PCV port on the charcoal canister if the line is going to the air cleaner assembly?

Also heres a picture looking down on the carb, taken from leaning over the passenger wheel:

Anything look fishy? I know its a bit of a long shot diagnosing these things virtually but any help is appreciated. If it would also help I can post the video of it starting up so you can hear what Im talking about.

Or...if anyone is running the same setup and could snap some pictures of the hoses that'd be greatly appreciated as well. Thanks!

truk820 is offline  
Sponsored Links
post #2 of 2 Old 01-12-2014, 11:00 AM
Registered User
1984 CJ7 
Join Date: Dec 2013
Location: floresville
Posts: 23
My 84 cj had all the lines hooked up except the most important one! And it would run only if I stayed in the throttle just like you have to. After really looking around I found out that there is a huge vacuum line hole at the base of the carb. It was not hooked up. I plugged it and it was like I instantly installed a new motor! You can also try that sniffer spray stuff that you spray around your lines to see if you have a vacuum leak. Slowly but surely I want to get rid of all the useless vacuum lines. I ended up installing a new Weber carb that doesn't use any vacuum lines or that electrical plug in. Increased my power and got rid of about 5 vacuum lines.
brandonbb is offline  

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.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

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 Off
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome