#4 Spark Plug Fouling... pic included - JeepForum.com

 
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post #1 of 8 Old 11-17-2013, 03:01 PM Thread Starter
chickenone
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Wj #4 Spark Plug Fouling... pic included

Hey Guys...
I'm having just one plug that keeps fouling... i took a pic of it.. any suggestions??
its just one.. #4

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post #2 of 8 Old 11-17-2013, 03:41 PM
MuddyWJ
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That looks like coolant is getting to it to me but don't know if that's possible. But NONE of your other plugs have corrosion right?
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post #3 of 8 Old 11-17-2013, 03:53 PM
Upside
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If it's an early '02 or pre-'02 4.0 you might have a cracked head. If it's cracked in between the water jacket and the intake valve side of the head it can do this. Usually between cylinders 3 & 4. Are you losing coolant?
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post #4 of 8 Old 11-17-2013, 04:32 PM
99_wj_QD
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that does not look like coolant, at all...coolant in the combustion chamber will leave a spark plug very clean, almost looking steam cleaned or brand new.

that plug is oil fouled, were you getting a misfire?? If the plug is fouling without a misfire condition then it is more than likely a leaking valve seal, no way to determine which valve seal is leaking (intake or exhaust) either way unless you are determined to fix the issue I would just leave it alone and check that plug condition every so often.

to replace a valve seal you must remove the valve cover to access the cylinder head components, then remove the valve springs on each valve, then the seals then install new seals and reverse the procedure...kinda lengthy and somewhat technical, very easy to screw things up with that valve cover off
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post #5 of 8 Old 11-17-2013, 04:39 PM Thread Starter
chickenone
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Its a 4.7 ...
its only Plug #4 and will miss fire
put in new plug runs like a champ for a month then have to put in new plug
losing coolant due to Heatercore leak ha
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post #6 of 8 Old 11-17-2013, 04:45 PM
99_wj_QD
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yeah well at this point im gonna say you should just leave it, a new plug every month is what, 2 bucks?? haha

that heater core leak can become a quite inconvenient issue tho, best of luck on staying warm this winter out there in cali lol

but if you would like to fix those seals I would be cool with helping you to get that done, just PM me if you would like some factory service info
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post #7 of 8 Old 11-17-2013, 05:16 PM Thread Starter
chickenone
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Quote:
Originally Posted by 99_wj_QD View Post
yeah well at this point im gonna say you should just leave it, a new plug every month is what, 2 bucks?? haha

that heater core leak can become a quite inconvenient issue tho, best of luck on staying warm this winter out there in cali lol

but if you would like to fix those seals I would be cool with helping you to get that done, just PM me if you would like some factory service info
oh thank you
heater works... just smells like pancakes
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post #8 of 8 Old 11-18-2013, 02:11 PM
Jeeples
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I'd say you've got an issue with a cylinder running lean, the third to last photo in this sequence looks pretty similar to your plug:



Any trouble codes or CEL present (aside, I'm assuming from a misfire from when the plug fails)?

His: '00 WJ 4.7 Limited- Some stuff

Hers: '03 WJ 4.7 Laredo- Some more stuff

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Quote:
Originally Posted by wjjeep19 View Post
It is what Jeeples has *PARTIALLY* stated.
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