> I changed the plugs in my 1999 Sienna last fall. The front three are =
> fairly easy to change, you'll need to remove the coils and plug boots & =
> wires first (it takes some tugging to get he boots off and you want to =
> be careful not to pull on the plug wires. Once they are out of the way =
> you will need a spark plug socket, the type with the rubber insert that =
> grabs onto the plug so you can pull it out, and an 6 "extension as the =
> plugs are in deep within valve covers. Access to the rear plugs is =
> another story. The intake manifold makes access difficult and the =
> aluminum casting has sharp edges. With patience and dexterity it can be =
> done, but after the back strain and several nicks and abrasions on arms =
> and hands, I would recommend taking it to someone else to have it done.=20
I wonder if the back 3 plugs can be easier replaced from underneath?