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Unread 07-27-2009, 06:38 PM   #1
esad_b
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TJ Stuttering..

Well recently my 97 TJ, 4cyl started stuttering randomly..

I start the jeep up and start driving and its just fine, but then all of a sudden my foot will be on the gas pedal (constant pressure) and the jeep starts to bog down and the speed starts to drop then picks up and drops again all this while my foot is still on the gas pedal with equal pressure.

I have no idea why its doing that, it just happens randomly. Any suggestions?

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Unread 07-27-2009, 06:55 PM   #2
GOLENJEEPTJ
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I would say your upstream 02 sensor?It would be a good idea to use some throttle body cleaner and clean out the throttle body.When was the last tuneup and what was done?
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Unread 07-27-2009, 07:08 PM   #3
esad_b
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Last tune up was 2 years ago, spark plugs, rotor, switch, wires.

Regular oil+filter change.

Hmm i really dont want to use that cleaner stuff i read on 4x4xlpor.com that it seems to mess up at times and not being able to start the jeep.

Any way to tell its the 02 upstream sensor for sure?
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Unread 07-27-2009, 08:39 PM   #4
cfmiller58
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agree with all those comments, mine does the same thing, but when i first get it started in the morning. the fuel pump is getting ready to go in mine. so watch out for that too
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Unread 07-27-2009, 08:52 PM   #5
esad_b
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fuel pump.. sweet..

How big of a job is this? And are they pricey?
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Unread 07-28-2009, 02:49 AM   #6
Jonny Jeep
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I'm in agreement with golenjeeptj over the O2 sensor. Further reading...

http://www.jeepforum.com/forum/f9/97-tj-sputter-stall-o2-sensor-612880/
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Unread 07-28-2009, 06:04 AM   #7
esad_b
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Quote:
Originally Posted by Jonny Jeep View Post
I'm in agreement with golenjeeptj over the O2 sensor. Further reading...

http://www.jeepforum.com/forum/showthread.php?t=612880
Thanks, looks exactly like what im having problems with. Im gonna try and unplug the upstream sensor tonight and run the jeep without it and see what happens.

Hopefully thats the case and not my fuel pump.
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Unread 07-28-2009, 07:58 AM   #8
kehoe
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When my TPS sensor went bad, my jeep had similar symptoms as to what you are describing. Replaced it with one from Advanced Auto for ~$50 (I think, its been a while) and it worked fine ever since
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Unread 07-28-2009, 09:16 PM   #9
esad_b
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Well i unplugged my upstream sensor today and drove around with the jeep did some light offroading also and no issues so far. Im gonna keep it unplugged for a few days to see if it happens if not guess ill be buying a new one.

Is it true that i should get the 02 sensor straight from the dealer or is it o.k to with NAPA, because i heard that if the voltages dont match accordingly it wont register correctly with the ECU. Anyone know about this?
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Unread 07-28-2009, 09:28 PM   #10
TJftw
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this happened to me it was my O2
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Unread 07-28-2009, 11:49 PM   #11
mightydog78
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my started sputtering too, but when i get to high speeds it goes away.

so if I have the same problem what is the cheapest thing to check/replace first?
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Unread 07-29-2009, 02:29 AM   #12
Jonny Jeep
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esad_b - I bought the two replacement sensors I've had in the past from aftermarket suppliers in both cases. No problems with either sensor regarding running or MPG. One was only replaced because the thread got damaged removing it when I had to swap out a shattered cat.

mightydog78 - Cheapest thing to check is the O2 sensor. It's easy to unplug and free. If it runs OK with the )2 sensor disconnected you either have a bad sensor or huge crack in the exhaust manifold.
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Online factory service manuals (FSMs) and parts lists can be viewed at http://www.jeep4x4center.com/knowledge-base/index.htm
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Unread 07-29-2009, 02:53 AM   #13
KKiowaTJ
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Mine also had this symptom when my CPS was dirty. I would drive down the rode and it was like the jeep totally shut down. I tried everything said here but came down to a dirty magnet and the two bolt mounts needed cleaned to get a better connection. So far not a dollar more spent on it except gas and oil. But what lead me to it was ground wires. I have cleaned all mine and relocated some. Good luck
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Unread 07-29-2009, 06:51 PM   #14
mightydog78
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Quote:
Originally Posted by Jonny Jeep View Post
esad_b - I bought the two replacement sensors I've had in the past from aftermarket suppliers in both cases. No problems with either sensor regarding running or MPG. One was only replaced because the thread got damaged removing it when I had to swap out a shattered cat.

mightydog78 - Cheapest thing to check is the O2 sensor. It's easy to unplug and free. If it runs OK with the )2 sensor disconnected you either have a bad sensor or huge crack in the exhaust manifold.
i actually do have a cracked exhaust manifold im hopefully getting fixed soon. so i bet thats my problem.
thanks for the help
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Unread 07-29-2009, 07:20 PM   #15
esad_b
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Well i have 100% concluded it is my upstream sensor. Usually if the jeep sits for long period of time in the parking lot and then i go to start it and start driving the jeep starts to jerk/stutter. Today for the first time that hasnt happened (02 Sensor still unplugged).

So i guess ill be picking up a new one. Is it safe to drive around with the 02 sensor unplugged?
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