I just tried to change out the sparkplugs in my 91 Civic DX. I replaced the wires at the same time, but when it came to getting the plugs out, no sparkplug wrench I have would go deep enough into the sparkplug wells to engage the nut surfaces on the plugs!

Do I need a special tool for this?

 

There are deep spark plug sockets for that (about 6-8" deep) mine cost $30 from my Matco dealer

 

So, I take it that the usual long ones don't work? I do have a long extension, but it seemed like that the socket I was using was too big around to get deep enough. I will try to dig up an extra deep socket, then.

 

Depending on the spark plug the porcelain end can be too long for the socket itself and the top will hit against the extension so the socket won't go over all the way, which being forced can break the plug. Or the rubber grommet inside the socket could be too tight for the plug, not very likely though. The socket I use it also rather thin walled, but a normal plug socket shouldn't be too wide for the walls...it was kinda made to go in there lol

 

advanced auto sells them like 3-5$ cheapie deep sockets with the rubber boot specifically made for doing spark plugs...