Hesitation - JeepForum.com
 
LinkBack Thread Tools
post #1 of 1 Old 02-17-2020, 04:14 PM Thread Starter
mickmeister
Registered User
1997 TJ Wrangler 
 
Join Date: Sep 2008
Location: Nashville
Posts: 283
Hesitation

In the last three years, my 1997 TJ 4.0 has hesitated at specific road locations, which was very weird. Some hesitations were on hills while others were on flat ground, and they were always at the same places. I started replacing all of the pertinent sensors, including the upstream and downstream O2, Cam Shaft, crankshaft, and MAP. I then cleaned the throttle body, replaced the fuel injectors, changed the plugs, plug wires, ignition coil pack, distributor cap, and distributor. Next, I replaced the muffler and catalytic converter with no luck. It was an annoyance, but not a big issue until last month when it got way worse. It would idle so bad that it sounded like it was going to stall. It did this for about ten minutes upon the first startup of the day. What was even weirder was that once it stopped hesitating from the first startup of the day, it was fine until the next morning. I could drive it into the office, sit for eight hours, and it started right up that evening with no hesitation. After replacing the distributor, the only thing left was the ECM. I ordered a new one from Flagship One in NYC. They are SLOW but good. It took three weeks until I got the new ECM. Don't waste your money on two-day shipping that costs $35, or one-day at the cost of $70. Finally, we replaced the ECM last week, and it now runs great.


NRA Life Member
mickmeister is offline  
Reply

Quick Reply
Message:
Options

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

Password:


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



Email Address:
OR

Log-in











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



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