Toyota Repair: change back rows of spark plug on sienna 98, plenum chamber, wire connectors

Question
Hi,
It is easy to change the front 3 spark plugs.  Where are the back row of spark plugs and how do I go about changing them?

Thanks


Answer
They are very hard to get to, first the plug wire connectors have to be pulled off, you can reach the two on the right through the opening below the plenum chamber the one on the left can be reached from the left side, once the connectors are removed and out of the way you will need a few different length extensions and a swivel extension and from there it's basically trial and error what combination of them will come up just high enough behind the intake chamber so you get a ratchet on them to break them lose, not a fun job even if you can get an air ratchet in there.