Q: What is the role of a spark plug, and how do you choose the right one for different driving conditions on Honda CRX?
A: The spark plug ignites the air/fuel mixture in the cylinder, forcing the piston downward and turning the crankshaft, which in turn moves the vehicle. Choosing the right spark plug depends on driving conditions; a long insulator nose retains heat to burn off deposits under light loads, while a short-nosed plug dissipates heat quickly to prevent pre-ignition and detonation under heavy loads. For normal driving, a standard plug suffices. Spark plug life varies with operating conditions, so inspecting them every 10,000-15,000 miles is essential for peak performance, and worn plugs should be replaced immediately. Checking for deposits and electrode wear can indicate engine issues, warranting further investigation. To replace spark plugs, label each wire with masking tape, remove the wires by twisting the rubber boot, loosen the plugs with a socket, and clean the area around the holes. After inspecting and cleaning the plugs, check the gap with a feeler gauge, oil the threads, and hand-tighten them into the cylinder head, torquing to 13 lbs. Connect the wires securely in the correct order. Ensure the electrode ends are not worn or damaged and that the insulators are intact; otherwise, replace the plug. Reusable plugs can be cleaned with a file or wire brush, and the gap should be adjusted as needed using a spark plug gap tool.