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Unread 07-01-2013, 09:47 AM   #1
PFISH1986
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1984 CJ7 
 
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Location: Fairbanks, Alaska
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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!!

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Unread 07-01-2013, 09:56 AM   #2
yahwhy
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Fuel filter/ bad gas /dirty fuel tank , vapor lock ,fuel pump would be some things to eliminate before throwing more money at it.
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Unread 07-01-2013, 10:08 AM   #3
wm69
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Sounds like a bad out of adjustment carb/ sticking choke to me. What carb do you have?
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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
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Unread 07-01-2013, 10:22 AM   #4
LumpyGrits
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See'n the Op's AO. I would say water in the gas. Very common issue in AK.
BTDT,
LG
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Unread 07-01-2013, 01:19 PM   #5
PFISH1986
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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.
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Unread 07-01-2013, 02:09 PM   #6
LumpyGrits
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A copy of the Factory Service Manual(FSM)is a MUST have.
Sounds like the carb's float isn't set 'rite'.
LG
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Unread 07-01-2013, 02:35 PM   #7
PFISH1986
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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?
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Unread 07-01-2013, 02:40 PM   #8
LumpyGrits
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Not a clue as we can't run'em on smogged Jeeps in Ca.
Nut'n wrong with the Carter.
LG
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Unread 07-01-2013, 02:57 PM   #9
wellmax
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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.
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Unread 07-01-2013, 03:05 PM   #10
PFISH1986
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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?
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Unread 07-01-2013, 05:12 PM   #11
Bubba Ray
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Have you done the nutter bypass?
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Unread 07-01-2013, 08:38 PM   #12
PFISH1986
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no what is the nutter bypass?
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Unread 07-01-2013, 08:43 PM   #13
keith460
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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.
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Unread 07-02-2013, 11:11 AM   #14
83vert
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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?
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