84 cj7 4.2l help!! - JeepForum.com

 
LinkBack Thread Tools
post #1 of 14 Old 07-01-2013, 09:47 AM Thread Starter
PFISH1986
Registered User
1984 CJ7 
 
Join Date: Jul 2013
Location: Fairbanks
Posts: 25
84 cj7 4.2l help!!

I have a completely stock 4.2L CJ and It was running perfect until I got about 10 miles then it would choke and sputter and I had to keep on the throttle to keep it running. I replaced the spark plugs that were black, wires and the coil. Cleaned the Carb by pulling out the jets and the venturi and cleaning the needles and the ports. Put everything back together and it fired up and idled just fine for about 1 minute then died. Tried to start it back up and had to press the gas to fire up then it would barely run and shoot black smoke!! I fixed all the vacuum leaks that I found. Any ideas would be much appreciated!!

PFISH1986 is offline  
Sponsored Links
Advertisement
 
post #2 of 14 Old 07-01-2013, 09:56 AM
yahwhy
Registered User
1982 CJ7 
 
Join Date: Jun 2010
Location: ofallon missouri
Posts: 551
Fuel filter/ bad gas /dirty fuel tank , vapor lock ,fuel pump would be some things to eliminate before throwing more money at it.
yahwhy is offline  
post #3 of 14 Old 07-01-2013, 10:08 AM
wm69
Registered User
1985 CJ7 
 
Join Date: Jun 2003
Posts: 3,993
Sounds like a bad out of adjustment carb/ sticking choke to me. What carb do you have?

85 CJ7 258, borla header, Team Rush, MC2100 ,optima batt, Warn 8274, agr super box 2 & pump, T5 w/ B&M shifter, centerforce 2, superior 1 piece axles, warn hubs 2.5 in lift, 31" BFG MT

85 CJ7 258, A/C, T176, MC2100, Team Rush, Warn XD8000i, superwinch hubs, 3in lift 31" BFG AT/KO
wm69 is offline  
post #4 of 14 Old 07-01-2013, 10:22 AM
LumpyGrits
Registered User
1985 CJ7 
 
Join Date: Jul 2010
Location: The Mojave Desert - Palmdale, Ca. U.S.A.
Posts: 6,248
See'n the Op's AO. I would say water in the gas. Very common issue in AK.
BTDT,
LG
LumpyGrits is offline  
post #5 of 14 Old 07-01-2013, 01:19 PM Thread Starter
PFISH1986
Registered User
1984 CJ7 
 
Join Date: Jul 2013
Location: Fairbanks
Posts: 25
I have the Carter carb I believe, I have cleaned everything in the carb what kind of adjustment would you recommend? I have seen the posts about putting a different carb on but i'm pretty new to the whole CJ seen and haven't looked into what can fit what would be the best recommendation for swapping a carb and best place? Also I still have all the emissions crap still all hooked up is it best to get rid of all that? what would be the best place to look at to find out how to eliminate that?

I just filled the gas tank completely up and the fuel pump is working just fine, its almost like its getting to much fuel for some reason. It really bogs down and I really have to keep on the gas to keep it running and black smoke just blows out.

Thanks for all the help.
PFISH1986 is offline  
post #6 of 14 Old 07-01-2013, 02:09 PM
LumpyGrits
Registered User
1985 CJ7 
 
Join Date: Jul 2010
Location: The Mojave Desert - Palmdale, Ca. U.S.A.
Posts: 6,248
A copy of the Factory Service Manual(FSM)is a MUST have.
Sounds like the carb's float isn't set 'rite'.
LG
LumpyGrits is offline  
post #7 of 14 Old 07-01-2013, 02:35 PM Thread Starter
PFISH1986
Registered User
1984 CJ7 
 
Join Date: Jul 2013
Location: Fairbanks
Posts: 25
I will adjust the floats when I get home I appreciate it! I looked into the weber carbs are they worth it to switch to?
PFISH1986 is offline  
post #8 of 14 Old 07-01-2013, 02:40 PM
LumpyGrits
Registered User
1985 CJ7 
 
Join Date: Jul 2010
Location: The Mojave Desert - Palmdale, Ca. U.S.A.
Posts: 6,248
Not a clue as we can't run'em on smogged Jeeps in Ca.
Nut'n wrong with the Carter.
LG
LumpyGrits is offline  
post #9 of 14 Old 07-01-2013, 02:57 PM
wellmax
Registered User
1984 CJ7 
 
Join Date: Nov 2008
Location: Hazel, KY
Posts: 1,250
I have a weber, it was a pain to get right, but runs good now.

lot of money to spent if your will run right sometimes.

if you are sure all other tune-up items are correct

I would spend some money on a good carb rebuild tech, let him try to get yours running first before you go the weber route.

have read many times that a good rebuild kit solved a jeep carb problem.

with all the laws in various states I did not throw away my old carb, I kept it in case someday it has to go back on for the jeep to run on the highway.

but in ky, so far we are good,

by the time you have a weber up and running you are going to have a chunk of change invested.
wellmax is offline  
post #10 of 14 Old 07-01-2013, 03:05 PM Thread Starter
PFISH1986
Registered User
1984 CJ7 
 
Join Date: Jul 2013
Location: Fairbanks
Posts: 25
I will try to adjust the floats first, every other post that I have read said that the carter is junk. I have a stepper motor on mine what are the symptoms if that messes up and what exactly does it do?
PFISH1986 is offline  
post #11 of 14 Old 07-01-2013, 05:12 PM
Bubba Ray
Registered User
1984 CJ7 
 
Join Date: Dec 2005
Location: SC
Posts: 1,696
Have you done the nutter bypass?
Bubba Ray is offline  
post #12 of 14 Old 07-01-2013, 08:38 PM Thread Starter
PFISH1986
Registered User
1984 CJ7 
 
Join Date: Jul 2013
Location: Fairbanks
Posts: 25
no what is the nutter bypass?
PFISH1986 is offline  
post #13 of 14 Old 07-01-2013, 08:43 PM
keith460
Jeep. There's Only One
 
keith460's Avatar
1984 CJ7 
 
Join Date: Jan 2007
Location: Doylestown, PA
Posts: 6,397
Carter BBD's are known for clogged idle tubes because of the Stepper Motor type carb that you have on your 84' model. Clean the idle tubes and there are websites about enlarging the orifice size on them slightly also. Clogged idle tubes cause poor idling and stumbling and is hard to keep running without feathering the throttle.

.
1984 CJ-7 Renegade
__________________

Restoration Thread:http://www.jeepsunlimited.com/forums...d.php?t=434226
keith460 is online now  
post #14 of 14 Old 07-02-2013, 11:11 AM
83vert
Registered User
1982 CJ7 
 
Join Date: Aug 2010
Location: New York
Posts: 957
Quote:
Originally Posted by keith460
Carter BBD's are known for clogged idle tubes because of the Stepper Motor type carb that you have on your 84' model. Clean the idle tubes and there are websites about enlarging the orifice size on them slightly also. Clogged idle tubes cause poor idling and stumbling and is hard to keep running without feathering the throttle.
Are the idle tubes different between the stepper carb and non stepper? Not to hijack but I have a almost brand new stepper carb and on my jeep now is a non stepper which runs ok but I was thinking of swapping to see if there is a difference?

I am in deep
http://www.jeepforum.com/forum/f8/how-did-happen-rebuild-1113470/
83vert is offline  
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.



Email Address:
OR

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.




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