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The Toyota V-6 in the Sienna has a plastic cover over the top of the engine which is held on with 2 Allen bolts. Loosen the Allen bolts and the back side of the cover pops off. On the front of the engine, on the cam cover, you can see that the V-6 has the coils on top of the front 3 plugs, one on each. Each of these coils plugs directly onto the front spark plugs, and also has a plug wire that leads to one of the back side plugs, so there are only 3 plug wires. They lead from a snap on connector on each coil, go around the (left as you stand facing the engine) side through a plastic cover, to the rear cylinder bank (way under the intake manifold) where the plug cap end pokes deep into the cam cover to snap onto the plug end. You remove them by reaching around and twisting and pulling straight out to pop the caps off the plugs deep inside the cam cover. It feels almost impossible as you can't reach them very well and you have almost no leverage. I got 2 reaching around the right side (right hand) and 1 reaching around from the left (left hand). This was for a well-needed spark plug change at 153k miles on my 1998 Sienna.
I haven't changed the wires myself, so I'm not sure exactly how the plastic wire cover comes off.
Working on the back 3 cylinders of a V-6 makes you appreciate a good 4-cylinder engine!
A good place to learn more about working on a Sienna is at:
www.siennaclub.org
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∙ 12y ago
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