Some update of idle, aaceleration, stall problem I have yesterday. And questions -
LinkBack Thread Tools
post #1 of 4 Old 04-02-2012, 06:59 AM Thread Starter
Registered User
Join Date: Sep 2011
Location: Columbia
Posts: 61
Some update of idle, aaceleration, stall problem I have yesterday. And questions

Below was my problem yesterday, and after I cleaned the throttle plate and TB, everything went back to normal.

But I do have a question to ask: if the rough idle, poor aceleration and stall are all caused by a dirty TB, that means not enough air got into the engine and mix with gas, so the exhaust should have more unburnt gas in it, and there should be CEL.....but there was no code, make me confused....

In contrast, if fuel system is clogged ( less gas and more air), the symptom should have no code....

Am I right in the above analysis? Anybody?

And is there anyone have ever seen a clogged fuel injector, do they really get clogged or die because of electrical failure?

Hey guys, I need your suggestion(s) here.....

Jeep: 2002 Grand Cherokee wj laredo sport, I6 4.0L

Problem: The problems happened after a 3-4 mile hill climbing with avg. speed around 20mph.

When the jeep was idling, the rpm dropped to ~500 or even lower, but it can be rescued (the rpm surged to 1500 then back to normal for a while, and then repeat the above again)

The jeep can still run, and when she was running, you hit the gas peddle, the rpm won't go above 1k rpm, and the jeep had a hard time to move forward...
The speed can increase by the surge of the rpm. If you keep the rpm stay above 1.5k rpm, she ran well, but when I came to a stop, sometimes she would stall(the rpm drop to zero with no rescue surge at all)

1. There is no code coming out, and there is no irregular smell in the exhaust.
2. The first thing I was thinking about is the TPS, I changed the current TPS 1.5 years ago.
3. The second thing I was thinking about is the camshaft position sensor, but there is no code....
4. The mechanic from O'reilly recommend sea-foam/fuel injector cleaner.

What do you think guys? Other than those, the only thing I can think about is I caught a turtle in the middle of the road....(set him/her free eventually in a lake)

Thanks~ Look forward to your suggestions.

lucer105 is offline  
Sponsored Links
post #2 of 4 Old 07-06-2013, 03:30 PM
Registered User
1999 WJ 
Join Date: Jan 2013
Location: Fargo
Posts: 967
I know this is an old thread but did anyone ever figure out what caused it? I have the same problem now

,,,soooo I graduated in 2013...
Highschool_WJ is offline  
post #3 of 4 Old 07-06-2013, 04:38 PM
Registered User
2003 WJ 
Join Date: Jan 2013
Location: Cincinnati
Posts: 3,152
Run some throttle body cleaner through it, clean the TPS. Does your exhaust seem to be coming out freely, or is your catalytic converter getting really hot? Could be that, too.

Sent from my iPad using Forum Runner
rdkendrick is offline  
post #4 of 4 Old 07-06-2013, 07:23 PM
narnwv's Avatar
2000 WJ 
Join Date: Sep 2009
Location: Cross Lanes
Posts: 6,417
FWIW, injectors can get clogged, and they can have electrical failure. I faced alot of the OP's symptoms, until two injectors finally died. I replaced all 8 and the Jeep has never run better.


To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
narnwv is offline  

Quick Reply

Register Now

In order to be able to post messages on the forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Jeep grand cherokee 1999 problem update ALEXANDER666 WJ Grand Cherokee Forum 4 09-21-2015 04:11 AM
02 WJ laredo Rough idle and sometimes stall problem lucer105 WJ Grand Cherokee Forum 11 08-03-2014 07:37 AM
99 Grand Cherokee Stall Problem RickIac WJ Grand Cherokee Forum 5 03-06-2012 02:03 PM
Stall Problem cfricker WJ Grand Cherokee Forum 14 02-05-2012 07:01 PM
WJ Stall at Idle & Rich Fuel Burn nuthinBUTjeep WJ Grand Cherokee Forum 0 09-27-2011 09:11 PM

Posting Rules  
You may post new threads
You may 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 On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome