Hard starting CJ7 - JeepForum.com
LinkBack Thread Tools
post #1 of 7 Old 11-07-2007, 03:10 PM Thread Starter
Registered User
Join Date: Aug 2007
Location: Maryland
Posts: 80
Hard starting CJ7

Hey guys,

I have a stock 86 CJ7 with the 4.2 litre engine along with the weber carb conversion. It's my toy and only gets driven every couple of weeks in the winter. After it has been sitting for that length of time it's hard to start. I never have an issue in the summer or if I started it everyday. But in the winter I have to pump the gas so much to get it to start. What can I do. The engine runs great and is tuned perfectly. Thanks


dhood is offline  
Sponsored Links
post #2 of 7 Old 11-07-2007, 03:16 PM
Registered User
1986 CJ7 
Join Date: Oct 2005
Location: Louisville, KY
Posts: 415
sounds like you need to adjust the carb for the colder climate. Or it could be a problem with your choke.

1986 CJ-7 w/ 4.0HO FI, 4" lift, 1" body lift on 35" Super Swampers, AX-15, and a girly sounding horn =(
ttrem is offline  
post #3 of 7 Old 11-07-2007, 03:39 PM
Bubba Ray
Registered User
1984 CJ7 
Join Date: Dec 2005
Location: SC
Posts: 1,696
Have you done the computer bypass?
Bubba Ray is offline  
post #4 of 7 Old 11-07-2007, 04:23 PM
Mike Romain
Registered User
1986 CJ7 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant
Posts: 18,083
That sounds to me like your gas line is air locking over time.

On the stock setup, the gas filter has two outlets. The center one goes to the carb and the top one goes to the return line. If the return line isn't up top, the gas will syphon back over time, usually overnight though.

The gas pump also has an anti drain back valve that could be getting leaky.

One other thing that can air lock the line is a pinhole leak on the suction side of the pump. The rubber lines can crack or the steel line leak and just leave a stain. When sitting, it can let air in.

86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos:
To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
(10 new albums added Sept 16/10)
Mike Romain is offline  
post #5 of 7 Old 11-07-2007, 08:03 PM
Registered User
1986 CJ7 
Join Date: Dec 2006
Location: Tampa, FL
Posts: 2,287
Is your choke working? I have the Weber 34/34 and it was the same way before I plugged in the electric choke. You'd have to pump it forever to get it cranked, and then it ran like poop for about 5 minutes. With the choke it cranks right up without any pumping, and will drive smooth as normal right after cranking...

1986 Jeep CJ7 4.2L I6 T176 (restoration in progress)
1961 Willys 4x4 Wagon L-226 I6 T90 (restoration also in progress)
SuB8HaVeN is offline  
post #6 of 7 Old 11-08-2007, 09:02 AM
Registered User
1980 CJ7 
Join Date: Jun 2006
Location: Pleasant Hill, CA
Posts: 608
Mine had the exact same problem and was very hard to start, but ran very well...

I am not 100% sure, but this is the only thing I have changed and it is starting much better recently... I cut the rough, corroded ends of my battery cables at the battery and solenoid, cleaned the cable and connections and reinstalled them.

I think the cleaner connections made a huge difference.
Blue83CJ7 is offline  
post #7 of 7 Old 11-08-2007, 09:48 AM
Registered User
Join Date: May 2007
Location: Oxford, MD
Posts: 54
I have the same problem. My electric choke is working, but i have to crank for awhile before it will start. The longer it sits, without running, the more I have to crank. It seems as though the carb is "drying-out" and the manual fuel pump has to work for awhile to fill up the carb again. My in-line fuel filter has only one inlet and outlet. Could this be my problem?
shelldrake is offline  

Quick Reply

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:
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

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Hard starting Problem....need help scanos Jeep CJ Forum 0 03-01-2009 07:05 PM
4.2L hard starting Jeepguy91 Jeep CJ Forum 4 12-01-2008 09:34 AM
Hard starting question Prospect62 Jeep CJ Forum 2 04-05-2006 02:22 PM
Very hard starting CJ7 258 leisyg Jeep CJ Forum 10 12-29-2005 08:52 AM
Hard starting medunwoody Jeep CJ Forum 2 12-04-2005 11:06 AM

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