Well, if the problem went away, then all should be fine. It's probably the old plugs misfiring is all. Couldn't explain the loose marble noise. Best wishes.
As far as plug socket goes, it's a 5/8". NGK said so. I posted the following February 21 2009:
Feb 21, 4:02 pm
My preferred spark plug for the Camry would be the NGK Iridium-IX, BKR6EIX-11 (or for a couple bucks more the Laser-Iridium with a platinum ground pad). If you want cheaper plugs, go with G-Power BKR6EGP but I wouldn't go cheaper than that. (For the 7A-FE 1.8L Corolla engine, consider BKR5EIX or BKR5EGP). Check
The fact that the second letter is K (for both plugs) means that it uses a 5/8" construction and you will need a 5/8" spark plug socket, such as:
$3.99 5/8" socket, 3/8" drive (this is what I use):
You need to follow torque specification in the REPAIR MANUAL, not necessarily the generic instruction on the NGK site, which says 18-21 lb/ft. Why? Because these are dry values. The manuals tells you to dab
*a little* spark plug anti-seize (2-3 threads AWAY from the tip end) and torque to 13 lb/ft. Since anti-seize lowers torque required, so 13 lb/ft is what you use, not 18. Otherwise you over torque and may strip the threads in the cylinder head (read: $$$$$).Generic spark plug > =A0 =A0 =A0I replaced the plugs today. I didn't see what I expected to se= e: