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I diagnose 1 of my misfire problems. My #5 cylinder spark plug and boot is almost burnt and alot of carbon deposits in the spark plug tube. Has anybody else had this problem? Is there a way to fix this?
 

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They need to be wrenched tight if you don't want them to leak.
 

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All my plugs are hand tight and yes it has a gasket.
only hand tight isnt quite anough. me personally i like to torque my spark plugs when i replace them. most people dont do that though
 

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Trepnician, if you are going to tourque your plugs, you need to share the specs for everyone!! (you post in lb-ft and I'll convert them to N•m for those DI.net members who use them)
 

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ive always followed the rule of hand tight then quarter turn with the wrench hasnt let me down yet
No no no! You tighten 'til it strips, then back off an eighth of a turn.
 

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I saw something about an insert or thread fixer. Can this work for a 3.5?
If the threads are stripped, yes. Helicoil™ is the most well known brand, although there are similar products that should work too. Measures need to be taken to keep the metal chips from falling into the cylinder (like putting grease on the tap), and directions need to be followed precisely.
 
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