Jeep sputtering when cold -
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post #1 of 3 Old 02-05-2002, 03:01 PM Thread Starter
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Jeep sputtering when cold

Hello all,
My 88 Wrangler 4.2 has a problem. When engine is cold, I get really bad sputtering at about 2k rpm, and black smoke coming out of the exhaust.

When engine warms up, problem goes away, and engine runs fine.

I figured this is carb related, but could it be the O2 sensor also? The carb is brand new, but could something be holding the choke in the wrong position? I just finished giving the engine a full tune-up.


88 Wrangler 4.2 5spd
33X11.50's, 3" lift.
Many exterior mods..
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post #2 of 3 Old 02-05-2002, 04:26 PM
Bob K
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Location: New Bedford, MA
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Yes, sounds like the choke is running too rich during warm-up. If the coil spring is not adjustable you might be able to adjust it by bending the arm. I recommend the JuiceBox ignition system to anyone with a pre-'91 YJ or CJ. Best $130 you could ever spend on your Jeep.

'87 Wrangler YJ 4.2 I6 (sorry, sold)
JuiceBox ignition
2 1/2" ProComp Lift
31" BFG A/T's
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Rear Track Bar in the shed
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'99 Grand Cherokee 4.7 V8
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post #3 of 3 Old 02-05-2002, 10:49 PM
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I have the same problem with MY 89 YJ. I was thinking about the juicebox. Do you happen to have a picture of it? Are there different models that i should be aware of?? Any advice would be great.
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