use the spark plug wrench and use used mirror to find the rear spark plug, you need to two person to do this, then fell the spark plug rear with your hands then apply the spark wrench to remove the old spark plug.
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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How do you change spark plugs in a 6 cly Toyota Camry?
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.