Error 43 code on '97 TJ - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > TJ Jeep Wrangler Forum > TJ Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 03-17-2015, 09:50 AM
Thread Starter
Maine Pup's Avatar
Join Date: Oct 2014
Location: Gardiner US
Posts: 41
Error 43 code on '97 TJ

Yesterday the check engine light came on and I am getting an error 43 code. I was on the highway doing about 55 mph, I'm usually just around town so no really fast driving. Could a bad catalytic converter cause it? It is rattling quite a bit. With the code on the jeep was still running as usually, no rough idle or anything. Two other things I've done are when the check engine light came on I was just coming back from having the oil changed. I usually do it myself but didn't want to lay out in the snow. The other thing was I let my wife use and the gas was down to 1/4 full and she use the 91 octane gas. I'm not sure that either of those could have anything to do with it. Thanks for you help and input!

Maine Pup is offline   Quote
Old 03-17-2015, 10:35 AM   #2
Knows a couple things...

WF Supporting Member
Jerry Bransford's Avatar
Join Date: Nov 2005
Location: Escondido, Calif.
Posts: 48,454
I'll write more on this tonight but '43' codes on '97 and early '98 TJ 4.0L engines are very common and are from a bad/weak batch of valve springs. The only real fix is either a new set of valve springs, but more commonly if the problem has been happening long enough to have damaged the valve seats, a valve job.

Tell your wife to only run 87 octane, higher octanes just leave unburned deposits behind and don't perform any better. In fact, higher octanes are harder and slower to ignite.
When you have a choice, buy American.
Jerry Bransford is offline   Quote

Thread Tools

Posting Rules
You may not post new threads
You may not 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 Off
Refbacks are Off

All times are GMT -5. The time now is 07:25 AM.

Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.1
User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.

Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, Gladiator, Mopar and Grand Cherokee are copyrighted and trademarked to FCA US LLC. is not in any way associated with FCA US LLC.