99 wj wont upshift at wot - JeepForum.com
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > 99 wj wont upshift at wot

WIN a Rough Country Forged Track Bar - ExtremeTerrain!FREE, FREE, FREE EVENT!! Save big on Lockers now till ApriJKS Grand Cherokee WJ, Adjustable Front Trackbar 1"-6

Unread 11-26-2013, 12:55 PM   #1
Registered User
Join Date: Nov 2013
Location: ogden, utah
Posts: 1
99 wj wont upshift at wot

I have a 99 grand cherokee with the 4.7 v8 in it. Its runs and shifts fine all the time. But when you go wot it wont shift into the next gear unless you let off. The rpms slow down when it gets higher and you can hear the engine whine. But its not missing and the tranny isn't slipping. When your on the freeway sometimes you can feel it slow real fast for just a quick second.

Tried a new tps that didnt help. Thinking its either one or both of the speed sensors on the tranny. The cat is clogged or the fuel pump isn't putting out enough psi at higher rpms. I had one place say they didnt think it was the cat now another place says it might be. But even when you free rev it the engine makes that sound and struggles at higher rpms. Thats why im leaning towards clogged cat or fuel pump.

Can someone please help. I keep hearing this is common for this jeep but nobody knows what it is!?

jeepmma2006 is offline   Reply With Quote Quick reply to this message

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.

Thread Tools

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.