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Unread 03-22-2007, 06:32 PM   #1
Hydro
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Engine misfire?

I have a problem with my jeep,the check engine light came on,so we pulled some codes and it say cylinder #6 misfire,so i tried new plugs and it's still running rough,i'm kinda stumped on this one,i don't know if it could be a dirty injector or what.still pondering any tips? Thanks.

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Unread 03-22-2007, 08:03 PM   #2
Hydro
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I forgot to add,it's a 2000 sport with the 4.0,thanks.
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Unread 03-22-2007, 08:17 PM   #3
Ronron2112
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Try swapping your injectors with a different cylinder, if the cylinder with the old #6 injector is missfiring, then you have either a bad injector or a dirty one. If it's still #6, then it could be a spark issue (check your coil pack) or faulty wiring on the injector (use a noid light to check this) Good luck!

(i have a 2000 XJ Sport with a dreaded #3 missfire...)

-Ron
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Unread 03-22-2007, 08:23 PM   #4
TXjeepTJ
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sea foam, it fixes anything! (give it a try)
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Unread 03-23-2007, 03:37 PM   #5
Hydro
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I tried the seafoam, didnt work. I'm getting ready to change out the injectors here in a few mins. If that doesnt work I dunno what to do next.

-Mike
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Unread 03-23-2007, 09:50 PM   #6
Ronron2112
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If the injector swap is still miss firing on #6, Se sure to use a noid light to check for power to the injector itself. If it has power, then it's gotta be some sort of spark issue. Since you've replaced the plugs, the leading factor has gotta be that $130 coil rail. double check all the connectors too, anything you could do for free beats replacing that coil rail.

But in my young life I've seen a CKP/CMP sensor on the fritz give a random missfire here and there. Good luck!

-Ron
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Unread 03-24-2007, 10:02 AM   #7
Hydro
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Thaks for the help guys. I changed out the entire fuel injector rail from another 4.0 I have at the house and it fixed everything.

-Mike
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