RPM surge at 70 - JeepForum.com

LinkBack Thread Tools
post #1 of 4 Old 09-15-2009, 04:26 PM Thread Starter
Registered User
2003 WJ 
Join Date: Sep 2009
Location: Bartlett, IL
Posts: 12
RPM surge at 70

Got a 03 WJ 4.7 and have an issue on long trips with the RPMs jumping 200-400 rpms at 70mph. Seems like it is going in and out of OD. It only does this when i take her on long trips 3+ hours. Anybody got an idea?

Ziesemer is offline  
Sponsored Links
post #2 of 4 Old 09-15-2009, 05:31 PM
Registered User
2008 JK Wrangler 
Join Date: Aug 2008
Location: Torrington WYO
Posts: 390
Had the same thing going wrong with my 04 wj. Its the torque converter locking and un locking. I was told that this was just an annoyance problem and nothing that bad. I replaced my TPS (throttle posistioning sensor) but before that I found that if I would push the pedal to the floor once or twice it would cure that problem as if something was just sticky and it would unstick...Ive also heard that a switch in the brake system can cause thisandcan be tracked down by trying to lift up on the brake pedal with your foot while driving.

~RIP Tory Edwards "bigbluezj94"~

Silver Jeep Club Member #4

2008 JK
Black Diamond 3in
315/75R16 KM2s
Smittybuilt XRC Stinger
Flat fenders

silver_laredoSE is offline  
post #3 of 4 Old 09-15-2009, 05:52 PM Thread Starter
Registered User
2003 WJ 
Join Date: Sep 2009
Location: Bartlett, IL
Posts: 12
Thanks...I had a tran pan leak and got that replaced. Maybe i was low on tranny fluid that caused the converter to act funny. I haven't been on a long trip since. I'm going this weekend...cross the fingers. I am also experiencing a low idle issue where the rpms drop from 600 to 400 at idle. When in park or N or the AC is on it idles fine. It only drops when in gear and the AC is not on. I order a Delphi IAC valve...maybe those two issues are tied together???
Ziesemer is offline  
post #4 of 4 Old 09-15-2009, 07:35 PM
Registered User
2000 WJ 
Join Date: Oct 2008
Location: New York
Posts: 655
The next time your driving, while you have your foot on the gas, use your right foot and tap the break just enough for your brake lights to come on. See if that is what your feeling.

If it is, then it's usually the TPS, at least that's what happened to me.

WJ. 4.Slow I6. The Underdog
2" Teraflex BB, 265/70R16 BFGoodrich TA KO's, JKS Adjustable Track Bar, JKS HD Tie Rod, Rusty's Tow Hooks, Block Heater, CB

New York City EMS

Originally Posted by LoneJeeper View Post
I came into this world via broken rubber, i'm not going out the same way.
flyboy14295 is offline  

Quick Reply

Register Now

In order to be able to post messages on the JeepForum.com 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
98 GC Limited 5.2L rpm surge raleighjeep06 ZJ Grand Cherokee Forum 9 11-30-2010 06:48 AM
Subtle HEMI Surge? tlkemp WK Grand Cherokee & XK Commander Forum 20 10-12-2010 01:50 PM
Engine Surge davejohnson ZJ Grand Cherokee Forum 3 09-01-2008 11:55 AM
99 WJ Limited 4.7 idle surge dacecil ZJ Grand Cherokee Forum 1 11-25-2007 01:37 PM
Idle Surge??? 2k4silverubi ZJ Grand Cherokee Forum 4 05-15-2007 12:35 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