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Old 03-29-2011, 06:20 PM   #1
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jeep bucking

Hey guys I have a 2001 wrangler, 2.5, 5 speed.

I noticed a slight hesitation that has gradually gotten worse. Yesterday it started bucking really bad. I changed the plugs, rotor, cap, and wires and while it runs a little smoother the hesitation is still there.

-when it bucks/hesitates the tach will jump all over the place
-only seems to do this after the motor has warmed up
-the hesitation is intermittent, sometimes it will go almost the whole day with no problems, other days its there almost all the time
-it also seems to buck/hesitate when I hit bumps in the road.

Im at a loss, the tach makes me think it still has something to do with the ignition. I don't loose any electrical power when it is doing this; Iíve tightened the ground strap and cannot find any loose connections.

Thanks in advance for any help any ideas? ignition coil?

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Old 03-29-2011, 06:27 PM   #2
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Has it thrown any codes? Sounds like what my Ram truck did when the O2 sensor went bad. I unplugged them and it quit. Temporary fix till I could get new ones

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Old 03-29-2011, 09:16 PM   #3
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Check the cam shaft position sensor on the bell housing
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Old 03-29-2011, 09:28 PM   #4
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I made that mistake the other day...the Crank Positioner is on the bell...not the cam Positioner as I was correctly corrected.
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Old 03-29-2011, 11:33 PM   #5
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Quote:
Originally Posted by Orngtruk View Post
Check the cam shaft position sensor on the bell housing
im a noob with jeeps, what am I checking? voltage? position?
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Old 03-30-2011, 03:47 PM   #6
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Yeah the crank position sensor not the cam shaft my bad
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Old 03-30-2011, 08:58 PM   #7
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I don't know if it's right or wrong but I've gone by the code that's thrown and change that part that's called out. I'm sure there's a better way but it's worked.
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Old 03-30-2011, 09:30 PM   #8
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it is throwing a cel, but its had a cel since I purchased the jeep. im going to get it read. parts are starting to get into the more expensive category.
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Old 03-30-2011, 09:44 PM   #9
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May also be related to the TPS...I'd definitely have the CEL codes read first and see if it's throwing one for that problem before you start tossing parts at it.
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Old 03-30-2011, 09:52 PM   #10
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Yeah I would check the TPS/Map sensor!!!!
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Old 03-30-2011, 11:11 PM   #11
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how many mile you got on it, tried cleaning the intake manifold and throttle body with a throttle body cleaner yet?
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Old 03-30-2011, 11:18 PM   #12
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bucking Jeep.
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Old 04-04-2011, 01:56 PM   #13
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sorry for the late reply, I was in training and could not tend to the jeep for a week. I had the codes pulled, two where small EVAP leaks and one was a large EVAP code. The other was the Crank position sensor. I replaced it yesterday and the hesitation/bucking is gone. Thanks for the help

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