89 4.2 problem. Won't go over 50 mph. - JeepForum.com
LinkBack Thread Tools
post #1 of 3 Old 09-12-2013, 07:14 PM Thread Starter
Registered User
1997 TJ Wrangler 
Join Date: Jul 2008
Location: NY
Posts: 117
89 4.2 problem. Won't go over 50 mph.

My brother has a bit of a dilemma with his 89 4.2 YJ. Motor ran good. He had an occasional chattering sound which turned out to be the timing chain hitting the cover from time to time. Without any warning, the Jeep just died when he went to pull away from a light. Figured it was an ignition system problem, swapped modules, coils, etc.. Turned out to be the timing chain was so stretched he was able to lift it right off the sprockets, so it probably jumped a tooth (or two).

Changed the timing set, cap, cap base, rotor, plugs, wires, fuel filter. Got it all back together, took some time to get it tuned but eventually got it running smooth again. The coil wire was arcing, but that was fixed with the new wires.

It starts up, idles, drives just as it did before this problem, until you reach 50mph. It runs normal from 0-50, once it hits 51 it falls on its face. He can wind out 1st-3rd like usual. It's like it has a governor on it. Throttle linkage all good, carb is clean. Cat isn't clogged.

He has a Weber 32/36, nuttered, Team Rush mod with MSD 6AL, Ford coil, the plugs and wires are ones recommended in a thread by JEEPHAMMER.

Anybody have any ideas?

TJQ is offline  
Sponsored Links
post #2 of 3 Old 09-12-2013, 09:32 PM
Registered User
1989 YJ Wrangler 
Join Date: Sep 2012
Posts: 37

Check out this link. I had similar problems.
Bergy1 is offline  
post #3 of 3 Old 09-15-2013, 05:48 PM Thread Starter
Registered User
1997 TJ Wrangler 
Join Date: Jul 2008
Location: NY
Posts: 117
Thanks for the info. He had to order the distributor so hopefully he will have time to mess with it tomorrow evening.
TJQ 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

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