Still Stumbling! Need Help! - JeepForum.com
 
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post #1 of 14 Old 10-14-2008, 03:42 AM Thread Starter
kongpheng
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2001 XJ Cherokee 
 
Join Date: Jun 2008
Location: sacramento
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Still Stumbling! Need Help!

Just last week I helped my brother with his 99 XJ.

His problem:

Hesitation / stumble / studder, whatever you want to call it. OBD code P0300which means -multiple cylinder misfire. This only happens from idle. While in Park and the pedal is pressed, it revs fine. When in drive and at a stop, it will hesitate / stumble / studder.... whatever you wanna call it.

So we changed out the spark plugs, wires, rotor cap and distributer rotor.

All the old parts we took out looked good except for the rotor cap and distributer rotor. they were Fudged UP! distributer rotor was messed up and looked like the culprit.

The Jeep started up perfectly with no problem. *** Jeep started fine before we did tune up too! ***

This week, it happened again. we took everything out. everything looks like how it did when we bought them from the LPS. We're stumped.


MY next thought would be....... the whole distributer system.

What do you think? Any advice would be great. Thanks.


2001 Cherokee XJ Sport 4.0L
3" Rough Country Lift w/ Daystar 1.25" TC Drop Kit
Flowmaster Delta 40 Series
K&N Drop in Air Filter & Procomp 10" E-Fan
AirRaid TB spacer w/ 62mm Bored TB
BFG All-Terrain K.O. on Black ProComp 87's
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post #2 of 14 Old 10-14-2008, 11:58 AM
Rtbeebe
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1997 XJ Cherokee 
 
Join Date: Mar 2008
Location: Kentucky
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Take off the distributer cap and see if there is any play in the distributer. If there is thats your problem. The firing is out of time and throwing a misfire code. If thats not it then check your coil pack. Upon giving gas the coil might be heating up and breaking down. Double check to make sure you got all the plug wires seated securely to the cap and plugs too.

97 Cherokee sport 4WD w/ 4.0
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post #3 of 14 Old 10-14-2008, 12:23 PM
CJ7-Tim
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Location: out in the garage - Minneapolis
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What brand and type of spark plugs. Most Cherokees do not run well on SplitFire type or Platinum type plugs. They seem to run best on plain old Champion Truck Plugs.

Test the Throttle Position Sensor. Consider replacing the Coolant Temp Sensor on the thermostat housing.

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post #4 of 14 Old 10-14-2008, 01:56 PM Thread Starter
kongpheng
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2001 XJ Cherokee 
 
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Location: sacramento
Posts: 217
Quote:
Originally Posted by CJ7-Tim View Post
What brand and type of spark plugs. Most Cherokees do not run well on SplitFire type or Platinum type plugs. They seem to run best on plain old Champion Truck Plugs.

Test the Throttle Position Sensor. Consider replacing the Coolant Temp Sensor on the thermostat housing.

We installed the Champion Truck Plugs.

2001 Cherokee XJ Sport 4.0L
3" Rough Country Lift w/ Daystar 1.25" TC Drop Kit
Flowmaster Delta 40 Series
K&N Drop in Air Filter & Procomp 10" E-Fan
AirRaid TB spacer w/ 62mm Bored TB
BFG All-Terrain K.O. on Black ProComp 87's
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post #5 of 14 Old 10-14-2008, 02:15 PM
carmannj
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2007 JK Wrangler 
 
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Quote:
Originally Posted by CJ7-Tim View Post
Test the Throttle Position Sensor.
X2 I had the same problem. It is a good thing to check when a XJ starts running like that. Alot of the computer's timing and fuel mapping is based on it.

2007 Rubicon Unlimited

2005 TJ Rubicon
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post #6 of 14 Old 10-14-2008, 05:00 PM Thread Starter
kongpheng
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2001 XJ Cherokee 
 
Join Date: Jun 2008
Location: sacramento
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Good thinking! I completely forgot about the CPS. My brothers XJ could be suffering from the CPS. I'll jump on this one and get back.

2001 Cherokee XJ Sport 4.0L
3" Rough Country Lift w/ Daystar 1.25" TC Drop Kit
Flowmaster Delta 40 Series
K&N Drop in Air Filter & Procomp 10" E-Fan
AirRaid TB spacer w/ 62mm Bored TB
BFG All-Terrain K.O. on Black ProComp 87's
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post #7 of 14 Old 10-14-2008, 08:10 PM
xjfever
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1995 XJ Cherokee 
 
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Location: north Ga.
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Not the cps, the tps= throttle position sensor.

  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
5. '08 BMW X3, Mods in progress.
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post #8 of 14 Old 10-15-2008, 07:08 AM
tjwalker
It's the crank sensor!
 
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Another vote for throttle position sensor testing....

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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post #9 of 14 Old 10-15-2008, 08:40 AM
ernesttbass35
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stuttering jeep

Take the computer out of that Jeep, pull one of the torx head screws at a time, cut it in half (they are 1/2 inch long), and replace it then do the other one. These screws are too long and iterfere with the operations of the main brain over time. I haven't had a problem since, and it's been 6 mos. or more. I had previously replaced everything in the electrical system before this, and things would straighten out for a week or two... now it is all set!!!
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post #10 of 14 Old 10-18-2008, 11:58 AM Thread Starter
kongpheng
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Join Date: Jun 2008
Location: sacramento
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Alright, CPS didnt work! Its been 4 days since we replaced it. P.O.S.!! Anyway, TPS will be the next thing to be replaced.

2001 Cherokee XJ Sport 4.0L
3" Rough Country Lift w/ Daystar 1.25" TC Drop Kit
Flowmaster Delta 40 Series
K&N Drop in Air Filter & Procomp 10" E-Fan
AirRaid TB spacer w/ 62mm Bored TB
BFG All-Terrain K.O. on Black ProComp 87's
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post #11 of 14 Old 10-18-2008, 01:52 PM
mctwin2kman
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1999 WJ 
 
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Location: York, PA
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I had a mild stumble I was getting. Did a full tune-up and found my Coolant Temp Sensor bad as well, replaced and still had it but not as bad. Replaced the O2 today and all is well now. So check you Temp Sensors, air and coolant, and O2.
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post #12 of 14 Old 11-03-2008, 03:12 PM Thread Starter
kongpheng
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2001 XJ Cherokee 
 
Join Date: Jun 2008
Location: sacramento
Posts: 217
Quote:
Originally Posted by mctwin2kman View Post
I had a mild stumble I was getting. Did a full tune-up and found my Coolant Temp Sensor bad as well, replaced and still had it but not as bad. Replaced the O2 today and all is well now. So check you Temp Sensors, air and coolant, and O2.
Thanks for the reply. Im not so sure the sensors have anything to do with My topic. My brother and I are just so friggin confused.

BTW, TPS has not been changed. Dont want to spend anymore money on this thing. I need a 100% suggestion.

2001 Cherokee XJ Sport 4.0L
3" Rough Country Lift w/ Daystar 1.25" TC Drop Kit
Flowmaster Delta 40 Series
K&N Drop in Air Filter & Procomp 10" E-Fan
AirRaid TB spacer w/ 62mm Bored TB
BFG All-Terrain K.O. on Black ProComp 87's
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post #13 of 14 Old 11-03-2008, 03:16 PM
xjfever
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I still say it's the TPS, which would have been the first thing that I replaced, but if you choose to do it last, then that's your call.

  1. '95 XJ country edition, 4" coils/3/4" spacers, HD leafs with extra main added in, Ironman adjustable control arms, rough country shackles, aussie locker, JK rubicon shocks, 35" mudder's, soft 8's, cobra cb
  2. Sold'99 WJ limited, 4.7L, 3" IRO lift. Bilstein shocks, JK rubicon wheels, 255/70/17's, carolina driveshaft, IRO adjustable control arms, IRO adjustable A-arm
  3. Sold '00 TJ, 4" lift, rusty's adjustable control arms, skyjacker shocks, rock krawler adj. trac-bar,rugged ridge SYE and RE driveshaft, soft 8's, 35" mud king xt's,XJ HP D30 w/aussie locker, 4:88 yukon gears, hella 500's, rock crusher diff covers
4. 04 Dodge ram 1500 quadcab, yes, it has a hemi.
5. '08 BMW X3, Mods in progress.
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post #14 of 14 Old 11-03-2008, 06:09 PM
tjwalker
It's the crank sensor!
 
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I think you need a change in strategy. I would recommend getting a good service manual and start "testing" parts. It is a much cheaper and more efficient way of isolating root cause than throwing parts at the problem. And in the process, you learn a tremendous amount about your vehicle. The TPS can be easily checked with a digital meter.

99 Cherokee, 4.0 AW4, NP242
Past Jeeps: 49 Willys, 81 Scrambler, 88 Comanche
Without "data", all you have is an opinion!
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