How to change rear spark plugs
Replacing the back "bank" of spark plugs will require that you remove the Intake Manifold/plenum. Some have got to them without it, but a little more worth and swival/extensions.
I replaced my 2005 Sienna rear plugs without removing the Manifold by removing the Windshield Wiper Housing (5 Minute job). It gave you 6 inches of room to get your fingers in there. Trying to remove the left rear without removing the wiper housing is near impossible.
These are the steps: 1 - Remove the wiper bolt and wiper. Then Pop out the plastic cover. It is just held by plastic "V" inserts. 2 - Unscrew the bolts in the metal bottom and pop out the bottom. All easy 5 minute job. 3- You can easily see the Plugs and the bolts to remove. there are few things with sharp edges. Use tape or something to cover them if you don't want to get cuts. 4 - Rest is simple plug removal. I tried to remove the left rear plug previously for hours without removing the wiper cover and could not do it. It took me less than 10 minutes with the wiper cover off.
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