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-   -   CYL#4 misfire (http://www.jeepgarage.org/f203/cyl-4-misfire-15677.html)

violant00 11-30-2010 02:29 AM

CYL#4 misfire
 
Well i'm bored at work and i'm still wondering about the misfire code im getting for cyl#4 I checked the spark plugs everything looks fine no burn or any wierd stuff i'm just wondering about gapping should it be .30 or .35? not really sure.:confused: btw 2000 WJ 4.0 I6

mrjaydeeone 11-30-2010 02:45 AM

Re: CYL#4 misfire
 
gap for I6 is 0.035. Same as I got in mine.

violant00 11-30-2010 05:22 AM

Re: CYL#4 misfire
 
Did you gap it yourself? and when you gapped it was the front or the rear of the sparkplug at .0035?

Quote:

Originally Posted by mrjaydeeone (Post 309388)
gap for I6 is 0.035. Same as I got in mine.


Frango100 11-30-2010 06:40 PM

Re: CYL#4 misfire
 
Besides other things, the misfire can be caused by a dirty/clogged or not well functioning fuel injector. You could swap it with an other cylinder to see if the fault follows.

mrjaydeeone 11-30-2010 07:16 PM

Re: CYL#4 misfire
 
Quote:

Originally Posted by violant00 (Post 309401)
Did you gap it yourself? and when you gapped it was the front or the rear of the sparkplug at .0035?

they came pregapped I just doublechecked and made sure they were right

dirtrider 12-06-2010 12:10 PM

Re: CYL#4 misfire
 
I had a similar situation with a cylinder misfire code on my 4.7. I did some research and found out it could just be clogged/carbon build up within the injector. I ran a can of seafoam through the brake booster per the instructions and the code vanished. that was about 10k miles ago and it hasn't reappeared. Might be worth trying since a can of seafoam is only a few bucks.


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