they are under a panel by the fuel rails. they are very hard to get to.
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Changing spark plugs is relatively easy. Disconnect the batter and spark plug cables, and remove the old spark plugs. Next replace the spark plugs with new ones, reconnect the spark plug cables and battery.
The same way you gap spark plugs for any car that uses spark plugs.
The 2000 Toyota Avalon spark plugs can be located on each side of the engine. The spark plugs will be near the bottom of the engine. There are three spark plugs on each side.
To change the spark plugs in a 1997 astro van do I have to change the spark plugs from the bottom of the engine/
Obviously- the spark plugs were not the issue :)