Check your owner's manual. The Iridium tipped plugs used in most late model engines don't need changing for 100 thousand miles. That's a good thing since (on the V-6 anyway) the rear plugs are a little tough to reach.
If yours is the V-6 here's something to consider. The cam drive belt is scheduled for a change at 90 thousand miles. Since so many items are removed for that service anyway it makes sense to change the plugs and water pump at that point.
Cheers
every 200,000 miles
To change the spark plugs on a 2004 Toyota Solara, first, ensure the engine is cool and disconnect the negative battery terminal. Remove the ignition coil cover if applicable, then carefully disconnect the ignition coils and remove them. Use a socket wrench to unscrew the old spark plugs, then install the new ones, torquing them to the manufacturer’s specifications. Finally, reconnect the ignition coils and battery terminal, ensuring everything is secure before starting the engine.
100-120K miles.
Every 100K or when necessary.
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To change the spark plugs on a 2006 Toyota Solara SLE with a 3.3-liter engine, first, ensure the engine is cool, then disconnect the negative battery terminal. Remove the engine cover if applicable, and locate the spark plug wires or ignition coils; carefully disconnect them. Use a spark plug socket and ratchet to remove the old spark plugs, then install the new plugs, ensuring they are properly gapped. Reconnect the ignition components and the battery terminal, then start the engine to check for proper operation.
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To change the spark plugs on a 2006 Toyota Solara V6, start by disconnecting the negative battery terminal for safety. Remove the engine cover if necessary, then unplug the ignition coil connectors and unbolt the coils to access the spark plugs. Use a spark plug socket to carefully remove the old plugs, and replace them with new ones, ensuring they are gapped correctly. Finally, reassemble the ignition coils, reconnect the battery, and start the engine to check for proper operation.
On a 2005 Toyota Solara SLE, the spark plugs are located on the engine's cylinder head. For the V6 engine, you will find them under the ignition coils, which need to be removed first to access the spark plugs. If the vehicle has a 4-cylinder engine, the spark plugs are directly accessible on the top of the engine. Always consult the vehicle's service manual for specific instructions and safety precautions.
Change the plugs and wires at 100,000 miles unless you experience poor performance or a drop in MPG. In that case change them sooner.