2004 Hyundai Accent Owner's Manual - Page 157

6 DO-IT-YOURSELF MAINTENANCE 8 REPLACING THE SPARK PLUGS G060B01A-AAT ! Recommended Spark Plugs: CHAMPION : RC10YC4 NGK : BKR5ES-11 G060C01S-GAT WARNING: The cooling fan is controlled by engine coolant temperature and may sometimes operate even when the engine is not running. Use extreme caution when working near the blades of the cooling fan so that you are not injured by a rotating fan blade. As the engine coolant temperature decreases, the fan will automatically shut off. This is a normal condition. Changing the Spark Plugs 0.039 ~ 0.043 in. (1.0 ~ 1.1 mm ) You will find it easier to change spark plugs if the engine is cold. Always change one spark plug at a time. This helps avoid getting the wires mixed up. G060A01L The spark plugs should be changed at the intervals specified in the vehicle maintenance schedule in section 5, or whenever engine performance indicates they should be changed. Symptoms that suggest poor spark plug performance include engine misfiring under load, loss of fuel economy, poor acceleration, etc. When spark plugs are replaced, always use spark plugs recommended by Hyundai. The use of other spark plugs can result in loss of performance, radio interference or engine damage. G060C01A-D NOTE: When replacing the spark plugs, genuine Hyundai replacement parts are recommended. 1. Remove the center cover on the engine rocker cover. 2. Using a clean cloth, remove any dirt that has accumulated around the base of the spark plug so it cannot fall into the cylinder when the spark plug is removed.