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Discussion Starter · #1 ·
My 2000 Frontier needs new plugs I went and pick them up and want to intall them myself, I put one in but when I went to put another one in the second cylinder on the passenger side it was very hard to unscrew i only unscrewed it half way....I think it is seized or cross threaded.....can any body offer help how to remove it without damaging the thread.

hank you
 

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With engine cold, try spraying in PB Blaster, Liquid Wrench, or similar and allow to sit a while. Get hold of a spark plug thread chaser tool in case you need it. Try to unscrew the plug. If it does happen that the threads strip out of the head and a thread chaser doesn't help, you can install a solid thread repair insert without disassembling the engine
(or use a Heli-coil). I currently have one solid thread repair insert on my VW engine.
 
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