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Unread 08-05-2010, 05:37 AM   #1
Odiwh
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98 Tj surging when cold

Hey guys I have a 98 Tj 4.0 with an automatic transmission. About a month ago it starting surging while I drive when the vehicle is cold. I will have the pedal pressed and rpm's at about 3000 and it will suddenly drop to 1000 then pick back up and drop again. It does this for about 15-20 seconds then usually stops. It also will stall at a stop light or stop sign every so often. Once warmed up it seems to run fine. I have replaced plugs,cap,wires,router, IAC and throttle body position sensor and it's still doing it. Does anyone have any idea what this could be? Has anyone seen this before?

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Unread 08-05-2010, 07:32 AM   #2
Odiwh
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Also, when the rpm's fluxuate there is a clicking noise coming from the front axle is sounds like, not sure if this is related to the problem
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Unread 08-05-2010, 03:00 PM   #3
Odiwh
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Bump
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Unread 08-05-2010, 03:23 PM   #4
AlphaTJ
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Check the upstream O2 sensor.

http://www.jeepforum.com/forum/f9/cu...bad-o2-723569/

Also for good measure, clean the battery posts and terminals. That corrosion created some weird gremlins with my 98.
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Unread 08-05-2010, 05:12 PM   #5
SnatchBlock
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Just had the exact same symtoms from my 99tj. Replaced the up stream o2 sensor and it is fine now.
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Unread 08-06-2010, 05:35 AM   #6
Odiwh
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The thread Alphatj directed me 2, the guy said he notices it's worse after the jeeps warm and he has to restart it. Once my tj warms up I never have a problem till it sits and gets cold again. Also it kinda feels like a misfire or it's have trouble getting fuel. I will try upstream o2 sensor though.
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Unread 08-06-2010, 11:56 AM   #7
AlphaTJ
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Quote:
Originally Posted by Odiwh View Post
The thread Alphatj directed me 2, the guy said he notices it's worse after the jeeps warm and he has to restart it. Once my tj warms up I never have a problem till it sits and gets cold again. Also it kinda feels like a misfire or it's have trouble getting fuel. I will try upstream o2 sensor though.
I included that link because Jonny Jeep gives a way to check the sensor, didn't clarify that in the original post. If you have replaced all of that other stuff, it could be worth checking out.
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Unread 11-10-2012, 03:26 PM   #8
PAFirefighter11
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Quote:
Originally Posted by Odiwh View Post
The thread Alphatj directed me 2, the guy said he notices it's worse after the jeeps warm and he has to restart it. Once my tj warms up I never have a problem till it sits and gets cold again. Also it kinda feels like a misfire or it's have trouble getting fuel. I will try upstream o2 sensor though.
Did you replace your upstream o2?
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Unread 11-11-2012, 09:08 AM   #9
Halverson
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Might seem obvious but check the tranny fluid. Lurching when cold happens on my TJ when its low.
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