Help, error code 300 -
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 > Models > Jeep Wrangler Forums > TJ Wrangler Technical Forum > Help, error code 300

Zone Offroad Body and Suspension Lift Kits, Brackets, DiscBilstein Shock Upgrade Kits, Jeep JK TJ XJ Wranglers and CStainless Steel Door Hinge Pins

Unread 08-20-2006, 01:42 PM   #1
Registered User
2007 JK Wrangler 
Join Date: May 2006
Posts: 333
Help, error code 300

Every once in a while I get the "check engine" light during a long trip or wheeling, it normally goes away after a few days.
I got it today again, did the whole diagnostics thing and it came up with 2 error codes:

300: Misfire detected in multiple cylinders, and
304: Misfire detected in cylinder #4

What could cause these misfires? Is it a major concern?

There are two types of pedestrians, the quick and the dead.
Existence is offline   Reply With Quote
Unread 08-20-2006, 01:48 PM   #2
Registered User
Join Date: Nov 2005
Location: Colorado Springs
Posts: 471
I had the same problem for over a year while I was running 32" tires with 3:07 gears. The problem hasn't re-occurred since I regeared.

I think constantly lugging the engine fouled the plugs.

My .02
'01 TJ. 4"Full Traction. 1" BL/MML. 35" BFG Muds. ARB's front & Rear. Full skids. Warn Winch. Lots of other crap!
ocezam is offline   Reply With Quote
Thread Tools

Suggested Threads

Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. is not in any way associated with Jeep or the Chrysler Corp.