change spark plugs on 2002 Toyota Camry

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How do you change spark plugs
(1) Answer
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Disconnect the electrical connection at each ignition coil, remove the 10mm bolt securing the ignition coil to the valve cover. Withdraw the ignition coils from the valve cover. The spark plugs are down in a recess in the center of the valve cover (one per cylinder) You will need a 9 inch 3/8 drive extension a 5/8 plug socket and a 3/8 ratchet.
Changing the front 3 is easy, but the back 3 are really hard. I heard that everyone having
problem with the back3 plug, sometimes take them average 1 to 2 hours to do this job.
Any ideas for easy way to take the back 3 plugs out and install new one in. Please help.