There is a new Haynes manual for the 9th generation Corollas, I recently saw it at Pep Boys or Auto Zone or someplace like that. I didn't buy it.
I have two questions with regard to checking/replacing spark plugs on a 9th gen. Corolla.
1. How do you remove the plastic cover over the engine? I've never done it. The fasteners that are on the corners of the plastic don't react to being manipulated by screwdrivers or pliers, unless a destructive amount of force would be applied. I can't move them. How do they work? I have the CD manual, but it does not address this issue. I need to know the direction they move for removal and replacement, how much force is necessary to move them, and what kind of tool is required. Is this cover necessary to the operation of the engine, or can it be deleted without any ill effects?
2. What is the spark plug gap? How do you gap an Iridium plug? I have no experience with them, and need the Iridium Plug 101. Please explain this to me as if I just came off the space ship from the planet Zlork, where we never heard of Iridium plugs.