4.0L Hesitation/ Stumble on acceleration - 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 > General Technical Discussions > Engines & Drivetrain > 4.0L Hesitation/ Stumble on acceleration

You Pick the Size and Style of Lift Kit. We will Find you Jeep Wrangler Complete Gear Upgrade Kits with Installs andJeep Wrangler Bushwacker Flat Fender Flare Sale at Baselin

Unread 07-29-2002, 05:32 PM   #1
Registered User
Join Date: Jul 2002
Posts: 41
4.0L Hesitation/ Stumble on acceleration

Hello, I have a 1990 Cherokee with high mileage (179k) on an original engine. The truck idles and runs fine, but when the throttle is just barely cracked off idle it stalls, nearly dying if held in that position. While driving, it produces a short hesitation just off idle while accelerating, then smoothes out and runs fine. I have attached a vacuum gauge to the intake, vac. normal at idle, cracking the throttle and holding it just barely open drops vacuum to almost nothing, engine runs rough and stumbles around, eventually smoothes out and runs fine at same throttle position.

I have replaced the oxygen sensor and cleaned the throttle plate and body, with no change. Would a worn timing chain produce these symptoms? Any help/ suggestions/ comments? Thanks! Regan

Woodtroll 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.
Note: All free e-mails have been banned due to mis-use. (Yahoo, Gmail, Hotmail, etc.)
Don't have a non-free e-mail address? Click here for a solution: Manual Account Creation
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

Suggested Threads

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.