White Smoke from Exhaust on a 2018 JK? - Jeep Wrangler Forum
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > JK Jeep Wrangler Forum > JK Tech Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on WranglerForum.com
Old 11-15-2019, 12:29 AM
Thread Starter
Join Date: Nov 2019
Posts: 1
White Smoke from Exhaust on a 2018 JK?

Hey all,

First time posting here, I'm hopefully a soon to be JK owner, While looking over a 2018 Wrangler Unlimited Sport S at a dealership today, as soon we turned the engine on, what appears to be white smoke came from the exhaust.

Here's a short video of it: http://https://youtu.be/Sso4xDkrpyI

It doesn't appear blue at all and I didn't pick up any particular odor.
It was somewhat cold out, around 40-50 degrees.
I checked a second Wrangler out only a few hours later to compare and there was no smoke whatsoever.

Here's the video: http://https://youtu.be/I9ssav9hgZk

So I thought I would see if the much more knowledgeable people here could shed some light on what the most probable cause of this issue is? And if something like this should dissuade me from buying it?
It does come with a warranty.

This might be unrelated but the only other issue was a ODB2 code B2390, Mist Switch Circuit Low. When checking under the hood, the windshield washer fluid reservoir cap was missing and hardly any fluid was left. It seems like it might have spilled or leaked out because lots of fluid was dripping from the front.

Hopefully this isn't the wrong place to post this. Thanks!

Attached Thumbnails
Click image for larger version

Name:	IMG_0183.jpg
Views:	10
Size:	107.7 KB
ID:	4185825  
JonathanBBlaze is offline   Quote
Old 11-15-2019, 06:29 AM   #2
MoabCarl's Avatar
Join Date: Jan 2019
Location: Metro Detroit MI
Posts: 604
White exhaust "smoke" after warm up is usually caused by coolant entering the combustion chamber and being vaporized. Causes - head gasket leak, cracked head, cracked block.

I'd stay away from any used vehicle that puffs out white exhaust.

Red Rock 4-Wheelers EJS Trail Gunner
2001 TJ 4.0 Auto
2007 JKU LS3, PR60s, too much to list....
2012 JKUR bone stock
2018 Tacoma TRD Off-Road
MoabCarl is offline   Quote

exhaust , white smoke

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 10:52 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.
Wranglerforum.com is not in any way associated with FCA US LLC.