0302 misfire still! - JeepForum.com
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 JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > WJ Grand Cherokee Forum > 0302 misfire still!

Introducing MONSTALINER™ UV Permanent DIY Roll On Bed LineRubicon Express Suspensions from CCOR 706-207-4140Smittybilt Hard Tops @ Oconee Off-Road! 706-534-9955

Unread 06-22-2010, 09:57 AM   #1
Registered User
2000 XJ Cherokee 
Join Date: Apr 2010
Location: richfield
Posts: 3
0302 misfire still!

2000 grand cherokee laredo 4.0. 0302 code still.
I have searched this site. Nothing found that is like this.
When i bought the trk, the coil pack was damaged over #2 cylinder. My friend who worked on it for the people i bought it from said that he changed it last year for the same reason.
I changed plugs( correct ones )New coil pack. Performed decarbonization of engine as per Dodge bulletin. Cleared engine fault codes. Ran good for 180 miles and light is back on and noticable rough idle again. CEL is lit but hasn't flashed with active misfire on the road. At road speed it runs smooth.
I have a feeling that the damaged coil pack is associated with the issue at hand but i dont want to throw parts at it. So if anyone has a good idea, let me know.

pintowagonbob is offline   Reply With Quote
Unread 06-22-2010, 11:28 AM   #2
Web Wheeler
rm2001wj's Avatar
2001 WJ 
Join Date: Aug 2005
Location: Memphis, TN
Posts: 3,100
Code P0302 means more misfires in cylinder #2 than there should be. Yes, it could be due to the coil pack (which you've replaced), but it could also be due to a bad plug (which you've also replaced), or a malfunctioning fuel injector. You could try swapping #2 fuel injector with #1 or #3. Always disconnect the negative battery cable when doing electrical work, and that usually erases the code also. Check to see if the code moves to the new cylinder where the previous #2 injector is now located.
2001 WJ Limited with Quadra-Drive, Kenne Bell Supercharger, 3-inch Kolak exhaust, Stillen rotors (F/R) and MM pads, Addco sway bars (F/R).
rm2001wj 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. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.