To replace the rear plugs: 1) Lay your chest on the the motor and reach around the intake manifold with both hands and remove the spark plug boots from the plugs. They should just require a good tug. You won't be able to see but you can do it by feel. Also, you may need to pull the PVC valve out of it's hole to access the right rear plug. Just remember to plug it back in later. 2) Use a 4 or 5 inch 3/8 drive extender and a standard 5/8 plug socket and carefully finagle the extender and socket into the plug well. There are obstructions back there, but it is possible to get this tool into each well and then put a short ratchet on extenter and turn it. A flex head ratchet helps. 3) Put some anti-sieze on the plug threads and install the new plugs 4) Reinstall the plug boots. 5) Reinstall the PVC valve.
The 2001 Toyota Sienna spark plug gap is .023. Most spark plugs will be pre-gapped by the manufacture of the spark plug.
Toyota says to change at 30,000 mile intervals in order to maintain Emissions warranty.
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The spark plugs on the 2nd bank are behind the engine under the crow bar. They can only be felt with hands follow the spark plug wires. Change the spark plugs are very easy but needs the proper spark plug socket and the wrench extension.
Good and tight, but don't break the thing.
To change spark plugs on a 1994 Toyota Camry, remove the black shafts. The spark plugs are down the four holes. Use a socket set with extension to reach the spark plugs. Replace old spark plugs with new ones.
Same relative position as the front plugs. They are just a lot harder to reach.
There is an article with video on how to change spark plugs at ; http://www.carbasics.co.uk Look in their 'how to' section.