If anyone still needs information on how to change the spark plugs on a 998cc IQ, I’ve provided details below after completing the job this afternoon. It should take about 90 minutes and is pretty straightforward. Tools required: 10mm socket, 10mm spark plug socket and extension, cross head screwdriver, flat head screwdriver, 3 new denso Iridium spark plugs 1. Disconnect the Battery connections 2. Loosen the clamps on the large inlet rubber pipe (cross head screwdRiver or 10mm