2003 Hyundai Accent Owner's Manual - Page 144

6- 8 DO-IT-YOURSELF MAINTENANCE G060B01A-AAT REPLACING THE SPARK PLUGS Recommended Spark Plugs: CHAMPION : RC10YC4 NGK : BKR5ES-11 3. To remove the spark plug cable, pull straight up on the insulated connector, not the cable. Pulling on the cable may damage the carbon core conductor. G060C01S-GAT 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. ! WARNING: It is recommended that the engine be cool or cold when changing the spark plugs. If the engine is hot, you could burn yourself on the insulated connector, the spark plug or the engine itself. 4. When preparing to remove the old spark plug, guide the socket down over the spark plug, being careful not to damage the ceramic insulator. 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. G060C02A-D