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post #1 of (permalink) Old 11-29-2002, 03:25 PM
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Runs rough on acceleration

Hi
I have a 83 cj7 with a 258/carter bbd, automatic.I got the cj FREE but in a box.I have it all together,fires right up and idols really good! BUT when I go down the road and accelerate it sputters alot and (yes theres more)when I go up hill it will stall out.Put it in park and it starts backup,but keeps sputtering and stalling untill I'm on flat ground and can let off the gas.I tried a search but didn't find anything.
Thanks for any help
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post #2 of (permalink) Old 11-29-2002, 03:35 PM
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Re: Runs rough on acceleration

I'd check the fuel filter, fuel lines and float level.
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post #3 of (permalink) Old 11-29-2002, 04:30 PM
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Re: Runs rough on acceleration

Thanks Raduckal,
I did check all that and seems fine.
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post #4 of (permalink) Old 11-29-2002, 05:54 PM
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Re: Runs rough on acceleration

Replace the fuel filter, get some SeaFoam from Carquest... run it in a tank, Check the Plugs for Oil on them, Check Plug Wires, check the rotor/cap... look under the cap for any grime. How long has it been doing this? [img]images/graemlins/smirk.gif[/img]
post #5 of (permalink) Old 11-29-2002, 08:27 PM
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Re: Runs rough on acceleration

Sounds to me like ignition. Since it's happening on more
than one cylinder I'd look at the coil wire (easy to just
swap in one from another car to try it.)

Could be coil, or low voltage to it.

Check the spark out of the coil wire while cranking
- should be a thin bright blue spark.
Fat red one means low voltage.
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post #6 of (permalink) Old 11-30-2002, 02:40 PM
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Re: Runs rough on acceleration

Thanks RRich,
I changed my fuel filter,wires,cap,rotor,coil,and the plugs all today.The plugs seemed all sooty,I figured it to be running to rich. I leaned it out to the point it would run rough at idel;took for a ride and about 3 miles down the road it started running rough again.It did pull a hill better but nothing like it should(from 35mph to 20mph at the top).When I got home I pulled a plug and it was all soot again.??? [img]images/graemlins/crazy.gif[/img] [img]images/graemlins/crazy.gif[/img]
post #7 of (permalink) Old 11-30-2002, 04:36 PM
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Re: Runs rough on acceleration

The black soot indicates really rich now, as long as you used
the right heat range plugs.

Make sure all the tiny little holes in top of the carb venturi
are clean, not plugged.
Spray some carb cleaner down those little holes. Those holes
are the bleed vents. Mixture is determined by the ratio of
the bleed vent size vs the jet size. Dirt sometimes get
stuck in there.

Make sure the return line from the fuel pump is not plugged
- plugging it will get the fuel pressure too high.

Try a Mexican tune up - rev it up to about 3000, hold your
hand tightly over the carb to cut off all the air until it
dies. It'll be hard to restart, flooded, but the high vacuum
created by your hand choking it off often sucks all the
crud/water out of the tiny passages, if that's what was wrong.

Check the carb's float level, it may be too high.


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post #8 of (permalink) Old 12-04-2002, 02:48 PM
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Re: Runs rough on acceleration

Thanks RRich,
I tryed to respond earler but my computer has been acting up.
Anyway....There is no return line anywhere on the cj so I didn't think it needed one. [img]images/graemlins/blush.gif[/img]
I got a new sending unit and plan to install it and a return line this weekend.After you said about the return line it all made sence..running too rich and all.I was going to do it outside this week but it was -8deg. this morning,so I think I'll wait till I can use a garage this sat.I'll check the float level too. Thanks again and I'll let you know how it worked out. [img]images/graemlins/smile.gif[/img]
post #9 of (permalink) Old 12-28-2002, 07:16 AM
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Re: Runs rough on acceleration

Well its been awhile but I got the new return line in and adjusted the carb(it was high).It made a big diference!!!It idels fine and runs down the road ok.
But...on any large hill it will slowly lose power untill it wont go any more,like it doesn't have enough power to make it up the hill(doesn't stall out just wont go up the hill).Seems to me maybe the transmission(auto).It has been sitting for about 3 years,has new filter and fluid.
Or do I have the carb set too low, I set it to the specs .25inch.
Maybe I'll have to move to the flatlands? Around here your allways going up hill!! [img]images/graemlins/crazy.gif[/img]
post #10 of (permalink) Old 12-28-2002, 08:15 AM
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Re: Runs rough on acceleration

hey check the choke operation. your problems sound similar to mine when i first got my jeep and it took me awhile to figure out. turns out my oil pressure sender was blown, which operates the electric choke.

</font><blockquote><font class="small">In reply to:</font><hr />
I got the cj FREE but in a box.

[/ QUOTE ]

so the rumor or the jeep-in-a-crate IS true!!!!!!!
I always knew it!!!!! [img]images/graemlins/grin.gif[/img]
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