1995 Laredo Weird "bucking" issues while driving - JeepForum.com
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Unread 08-06-2006, 04:17 AM   #1
jrsquared
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Join Date: Jul 2006
Location: Bay Area, CA
Posts: 7
1995 Laredo Weird "bucking" issues while driving

Hey,

I have a 1995 Laredo 4x4 sitting at the curb that has weird "bucking" type issues totally randomly while driving, sometimes it will happen, sometimes it won't. I don't really know how to explain it except as a bucking, jerking feeling. When it starts to happen, if I pull over, and rev the engine, it will sputter/buck/jerk as well. It will also stall sometimes at red lights (its an automatic). I don't know if these are all related or are completely different. Any help would be appreciated if anyone even knows what I'm talking about!

Thanks!

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Unread 08-06-2006, 05:00 AM   #2
greasefingers
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1994 ZJ 
 
Join Date: Sep 2003
Location: Northern VA, USA, NJ
Posts: 8,237
Thatís a little unusual. My two guess are: fuel pump or output speed sensor.
Pull the codes
Extracting Fault Codes:
Turn the ignition switch ON, OFF, ON, OFF, ON and observe the CHECK ENGINE LIGHT. The CHECK ENGINE LIGHT should begin to flash a series of codes. The flashes will be separated by short and long pauses. The long pauses separate the "ones" and "tens" positions, and each code from the next. A code 55 will be displayed at the end of the test.
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Cheers Steve

94 Black Laredo 4-Liter with QuadraTrac (42RE trans & NP249 TC) 200,000 + miles purchased new

88 Cherokee 2-door with 5speed manual 139K miles(deceased) purchased new
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Unread 08-06-2006, 04:58 PM   #3
jrsquared
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Join Date: Jul 2006
Location: Bay Area, CA
Posts: 7
I tried checking the codes, no codes... I want to sell it but I want to know if it would be worth it to fix it first. But if the problem is too hard to diagnose, I don't want to spend money replacing parts that arent the issue...
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Unread 07-12-2011, 07:20 AM   #4
fishjeep1
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1998 ZJ 
 
Join Date: Oct 2010
Location: New Orleans
Posts: 14
this is the reply that I got, worked great hope it works for you
"That would most likely be your upstream 02 sensor (closest to the engine)

Unplug it for a few days . You will get a CEL , but , the symptoms should disappear and run fine . Replace sensor ASAP if this is the case . CEL will disappear after the sensor is reconnected ."
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