post #1 of Old 08-14-2013, 02:58 PM Thread Starter
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Join Date: Oct 2011
Posts: 294
misfire on cylinder 8

I have a 99 gc with the 4.7 keeps getting misfire code I've replaced the coil and plugs any ideas

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post #2 of Old 08-14-2013, 03:24 PM
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1999 WJ 
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Location: Lenoir
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Mine did the same thing. I ended up having to change the fuel injector and its been fine for the past year now.

1999 WJ Limited 4.7 4x4 - 15x8 pro comp soft 8's - 2.5" bb- 31x10.50x15 General grabber at2
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post #3 of Old 08-14-2013, 07:57 PM
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2004 WJ 
Join Date: Feb 2009
Location: Grand Rapids MI
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I just went through this with cylinder 1. Swap the injector with another cylinder. Make sure you don't **** up the rubber seals. If you're lucky you won't be paying $8k to have the stealership put a long block in like I am.
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post #4 of Old 08-14-2013, 08:23 PM
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2004 WJ 
Join Date: Jul 2013
Location: bakersfield
Posts: 1,016
Test the injector with a ohmmeter. If reading is 12 ohm (+/-), injector is good. Report back.
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post #5 of Old 08-15-2013, 01:43 AM
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2006 XK Commander 
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Location: Wilmington, NC
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Been there, done that. Mine on the WJ started in #4. After I put a new injector in #4, then #8 started. I took the fuel rail off again and did #8 and #2 for good measure while I was in there. That was five years ago. I have not had a misfire since then.

'06 XK Limited, 5.7L, QD II, Black, 150K
'02 WJ Overland, 4.7L HO, QD, Inferno Red, 115K
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post #6 of Old 08-20-2013, 11:51 PM Thread Starter
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Ok thanks I'll try swapping injectors and cleaning fuel rail I did notice the spark plug gets pretty gunked up kinda looks like oil had it checked out they said to change o2 sensors but I don't think that's it
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