TRQ Ignition Coil SET of 6 for 04-10 V6 3.3L ES330 RX330 Camry Solara Highlander. Ignition Coil Features & Benefits. The ignition coil is a crucial part of your ignition system. It's function is to convert the 12 volt power of your vehicle's electrical system in to 35,000 or more volts. This produces a high intensity spark at the spark plug which then ignites the fuel in the cylinder. Coils in general will wear out over time. This will cause a misfire condition. Brand New Ignition Coil Set. Built to strict quality control standard. Our electrical and electronic parts are subject to ...