really bad stumble when my rig is warming up!! - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today


Reply
 
Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 03-24-2010, 08:39 PM   #1
Jeeper
 
Join Date: Sep 2009
Posts: 29
really bad stumble when my rig is warming up!!

Hello all, I have a 98 tj 6 cylinder stick that has about 120k on the clock. Its a great ride, but has developed a very bad stumble when its warming up. It always happens when the temp is roughly 140, the rpm drops to about 200 and it shakes violently! Is this a common problem with Jeeps and does anyone have a suggestion that might help out? Thanks for any help everyone

slow-s is offline   Quote
Old 03-24-2010, 08:59 PM   #2
IITYWTMWYBMAB

WF Supporting Member
::WF Administrator::
 
4Jeepn's Avatar
 
Join Date: Apr 2005
Location: Florence, KY
Posts: 10,783
Nope not normal. How long does this shaking last? Will it only shake if left to warm up, or does it happen if you get in and drive it to warm it up? And codes or check engine light?

__________________
79.96.85.00.01.97.00.97.93.97.95.94
CJ.XJ.CJ. TJ. TJ.ZJ. TJ.TJ. ZJ.ZJ.YJ. XJ
4Jeepn is offline   Quote
Old 03-24-2010, 09:05 PM   #3
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 36,282
When is the last time you cleaned your throttle body's interior, which really means how long has it been since the IAC (idle air controller) bolted to the throttle body has had any TB cleaner pass through its innards?
Attached Images
 
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote
Old 03-25-2010, 02:29 PM   #4
Jeeper
 
Join Date: Sep 2009
Posts: 29
The shaking last for about 2 minutes. It does it whether I let it warm up itself or I'm driving, it makes no difference other than it warms up a little quicker and gets out of that stumbling range. As far as how long its been since a good cleaning, I would venture to guess a solid 120k!!! I have only had the rig for about 10k and wouldn't bet that the people before me did much of anything. I will clean that out tomorrow. Thanks and please keep the ideas coming
slow-s is offline   Quote
Old 03-28-2010, 07:24 PM   #5
Newb
 
Join Date: Mar 2010
Posts: 1
I have a 1998 Wrangler 4.0 with 193,000 miles doing the same thing. The Jeep starts fine and idles fine. When you initially start to driving it runs perfect and as the engine begins to warm up it begins missing and starts shaking. I have to push in the clutch and keep the RPMS up to stop the shuttering and missing. Once the engine reaches normal operating temp it runs perfect again. No engine codes or check engine light ever turn on. I checked the throttle position sensor and that tests out fine. Ran a can of sea foam through it and no change. Changed plugs, distributor cap and rotor and still no change. Looking for some ideas.
kkots is offline   Quote
Old 05-17-2010, 01:52 PM   #6
Jeeper
 
Join Date: Sep 2009
Posts: 29
Bump for some more ideas. Thanks everyone
slow-s is offline   Quote
Old 10-08-2010, 07:14 PM   #7
Jeeper
 
Join Date: Sep 2009
Posts: 29
I am bringing this thread back to life because i have yet to find a fix for this. Recently my jeep was showing a code/ It was P0118 i believe which was the coolant temp sensor. I changed that and still no improvement. Could it be my O2 sensor? thank you for any help
slow-s is offline   Quote
Old 10-08-2010, 08:02 PM   #8
Jeeper
 
tylerlepage's Avatar
 
Join Date: Feb 2010
Location: Central Maine AND Downeast Maine
Posts: 41
Hey all....This is exactly what has happened to me.... it i believe was my Upstream O2 sensor....Looking under the hood you can see where it connects to the engines wireing harness.. i have unplugged mine and it made this stumbling stop all together... i went and bought a new o2 sensor now it is fine....try unplugging it by the intake manifold ( the plug) and try running it this is how i found out mine was faulty! let us know how this works for you
tylerlepage is offline   Quote
Old 10-11-2010, 12:28 AM   #9
Jeeper
 
Join Date: Sep 2009
Posts: 29
Thanks so much for the advice. I will try it first thing in the morning!
slow-s is offline   Quote
Old 10-11-2010, 07:07 PM   #10
Jeeper
 
Join Date: Sep 2009
Posts: 29
So I think it was the upstream o2 sensor. Does it matter if I drive this without the sensor plugged in? I live in a area that does not have smog laws so I'm not worried about that and I will be replacing it but won't be able to for a couple days. Thanks for the help everyone
slow-s is offline   Quote
Old 10-11-2010, 07:24 PM   #11
Knows a couple things...

WF Supporting Member
 
Jerry Bransford's Avatar
 
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 36,282
No problems driving it without the 02 sensor, though it may eventually cause a Check Engine light which is no big deal.
__________________
When you have a choice, buy American.

Jerry Bransford is offline   Quote
Old 10-14-2010, 09:11 AM   #12
Jeeper
 
tylerlepage's Avatar
 
Join Date: Feb 2010
Location: Central Maine AND Downeast Maine
Posts: 41
mine was ran like this for awhile and never hurt anything when you can get a new one i would go that route possibly get a little bit more MPG. were you throwing any other CEL's that were not O2? if so this could be the cause of the faulty o2 and should be corrected before you replace it and that one goes bad
tylerlepage is offline   Quote
Old 10-14-2010, 09:05 PM   #13
Jeeper
 
bobsalmon's Avatar
 
Join Date: Sep 2010
Location: SE. PA.
Posts: 31
I'm a mechanic and a wrangler owner. The o2 sensor will make it run richer since the sensor isn't switching rich/lean. The computer will run in safe mode to protect the engine. Your next problem is if you run rich for a long time, you can damage the cat. conv. by passing raw gas ( hydrocarbons ) into and thru the cat. Buy the sensor and reset the PCM. Drive it for at least 100 miles to see if it comes back. I still think that it's the ECT, i.e. coolant temp probe. Also, the check eng lamp will go on as soon as the eng temp is up to operating temp, 195deg. The PCM looks for this temp to enable closed-loop mode and then starts listening to the O2 sensors. Plus, O2 sensors are the primary reason for fuel economy. Not that Jeeps ever get good mileage.
bobsalmon is offline   Quote
Old 10-14-2010, 09:07 PM   #14
Jeeper
 
bobsalmon's Avatar
 
Join Date: Sep 2010
Location: SE. PA.
Posts: 31
Oh, forgot to metion. Clean the MAF too. Pecker Boys sells a spray cleaner that is safe to use on it and not damage the active elements.
bobsalmon is offline   Quote
Old 10-14-2010, 09:32 PM   #15
Jeeper
 
aelwero's Avatar
 
Join Date: Jul 2010
Location: Fort Bliss TX
Posts: 1,669
Quote:
Originally Posted by bobsalmon View Post
I'm a mechanic and a wrangler owner.
can you fix my Jeep?
There isn't anything wrong with it yet, but for when it does break?

is admitting to being a mechanic not asking for trouble? I'm not a mechanic (well... I'm actually sort of a radar mechanic) , but seems like 5-6 times a month someone's asking me to come fix their car for em... this past weekend it was a distributor that got replaced and the guy didn't realize that the distributor went in a certain direction or the wires had to go on a certain way...

charged him TWO fifths of kalhua for that one
__________________
'71 DJ-5 (that isn't a typo)
'10 JKU Sport RHD

RHD... it's a jeep thing
aelwero is offline   Quote
Old 10-15-2010, 01:15 AM   #16
Jeeper
 
Join Date: Sep 2010
Posts: 260
It might be the coilrail it just fixed mine And had the same problems

Littleyellow is offline   Quote
Reply

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Stumble at 2000 RPMs jhilts TJ General Discussion Forum 2 05-06-2012 09:52 AM
Reports Global Warming Fake a Tad Premature NeitherFanboy Off-Topic 19 12-22-2009 11:20 AM
Ticking noise while warming up dj_chizzle TJ Tech Forum 3 12-01-2009 06:11 PM
Global warming pics. skeeter Off-Topic 59 02-02-2008 01:26 PM
Is warming up really necessary???? hedonist General Jeep Discussion 14 01-17-2008 11:13 AM



Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 09:35 AM.


User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2015 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC