Help, error code 300 -
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post #1 of 2 Old 08-20-2006, 01:42 PM Thread Starter
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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?

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post #2 of 2 Old 08-20-2006, 01:48 PM
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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!
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