OK, I ventured under my hood to attempt more than just check the fluids, and help jump a friends car... I wanted to replace my plugs, and possibly wires. I have noticed a little lag in performance lately, and believe it or not, I have 80K miles on my Corolla already! So I thought it was time to maybe replace these things.
I pulled off the plastic cover on top of the engine, and see these large squarish plug like things right on top, held down with a single bolt. I take the bolt off of one of these, and the it loosened up whatever it was holding down, but it wouldn't come out. I assumed this square thing was covering the top of a spark plug, but I could not get the thing off. I bolted it back down, and put the plastic cover back on. Verified I hadn't screwed up anything, and went to the internet to find an engine diagram for my year Corolla. Could't find one, so now I'm asking all of you great people.
What was the thing I was trying to remove. Was it plug related?
I just need some help.