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The spark plugs are located under the coils.(front bank) One 10mm bolt holds down the coil, remove it and unplug the coil and the spark plug wire leading to the rear 3 cylinders. Remove the coil by lifting up to reveal the plugs. That is the front 3 cylinders. For the rear 3 cylinders you will probably need to remove the upper intake plenium unless you have super small hands to reach around the back and remove the plug wires and gain access to the plugs. GOOD LUCK !!! I hate doing tune-ups to these engines.

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โˆ™ 2005-02-01 20:06:47
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Q: Where are the spark plugs located on a 2003 Toyota Sienna?
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