2003 Hyundai Elantra Owner's Manual - Page 144

DO-IT-YOURSELF MAINTENANCE G060C01S-AAT Changing the Spark Plugs HGK257 HGK258 HGK256 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. 5. To remove the spark plug, turn the wrench handle in a counterclockwise direction. 6. To replace the new spark plug, guide the socket down over the spark plug, being careful not to damage the ceramic insulator. NOTE: Spark plugs should be tightened firmly. Overtightening can damage the threads in the aluminum cylinder head. Leaving them too loose can cause the spark plugs to get very hot and possibly result in damage to the engine. 7. Replace the cable by pushing the insulated connector directly down onto the electrode. Check to be sure it has snapped into place and can't fall off. 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. 1. Remove the center cover on the engine rocker cover. 2. Using a clean cloth, remove any dirt that has accumulated around the spark plug so it cannot fall into the cylinder when the spark plug is removed. 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. 6-8