Join Date: Nov 2010
2007 Elantra-- 2006 Santa Fe 3.5 GLS,2005 Elantra hatch,2009 F150
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Its best if the engine is stone cold before you start ; its what they recommend normally.
Just check the gap ; out of the box they are almost always alright . If you have a proper set of plug gages you could drop it down to .040. Most sets won't have a .041 feeler gage to work with.
I like to put die-electric grease on the inside of the plug boots, prevents corrosion and makes them easier to get off the next time. Theoretical life of wires is around 150k kilometers or 5 years ; but some people push it farther.
Oh year the plastic covers have to come off to get at the plugs and wires. Torque wrench is a good idea for installation, especially if you haven't changed plugs before. The old ones will take quite a bit to get moving , but they should come out fine. Some people put a few drops of oil on the threads of the new plugs, its not very critical in my opinion. Always start the plugs by hand for the first few threads ; making sure to not cross thread them. Good luck.