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Unread 09-16-2013, 07:31 PM   #1
kharney
Registered User
2003 WJ 
 
Join Date: Jun 2011
Location: milton, ny
Posts: 75
help jeep misfiring!

So my jeep was running rough, 03 4.7 130 k on it and I was thinking maybe it was just a bad batch of gas because I just filled up this morning then it got worse and now I'm throwing a p0302 cylinder 2 misfire idk what to do my plugs are recent maybe 10 k ago replaces with champion platinum I believe.. And advice? Do you think that it could be a bad tank of gas?

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2003 4.7 quadratrac II 120k bone stock for now :)
Dana 30/186MM Front Axle
3.73 Rear Axle Ratio
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Unread 09-17-2013, 12:46 AM   #2
doorjamm
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2000 WJ 
 
Join Date: Sep 2012
Location: Granite Bay, California
Posts: 646
Clean your iac. Plenty of threads on that. Also YouTube videos. See if that helps.

There might be a way to do a homemade smoke test to check for a vacuum leak.

Could be a lot of things though, search function on the forum is a huge help in these cases.
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Unread 09-17-2013, 01:58 AM   #3
perfeng702
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1999 WJ 
 
Join Date: Jul 2011
Location: Las Vegas, NV
Posts: 132
Double check your plug to make sure it's not fouled. Swap the #2 coil with a coil from another cylinder. Clear your codes. If the code jumps to the cylinder you swapped coils with, your coil could be bad.
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1999 WJ 4.7, 242HD, IRO 4" Long Arm, IRO Adj Track Bar, JKS BPE, JKS Quick Disco, 15" Cragar D-Window, 32" BFG KM2, V3 Projectors, DDM Tuning 55w 5k HIDs
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Unread 09-17-2013, 08:06 AM   #4
oldfamilyguy
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Join Date: Dec 2008
Location: oakville, canada
Posts: 791
have you ever overheated? If its not a spark or fuel issue it can be a loose valve seat, when it happens usually on #2 cylinder
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