FAQs - Spark Plugs
Q: How often should I replace my spark plugs? Q: How do I choose the right spark plug? Q: How do I "read" a spark plug? Q: How much of a performance improvement can I expect from changing plugs? Q: What is a "fouled" spark plug? Q: Do I need to set the "gap" when installing a new set of plugs? Q: Are special plugs always necessary on a modified engine? Q: How do I install spark plugs correctly? Q: When should I use a resistor spark plug? Q: Why are there different heat ranges? Q: What do the numbers and letters in a part number represent? Q: Does humidity affect spark plug temperature? Q: Does ignition timing affect a spark plug's temperature? Q: Does compression ratio affect firing end temperature? Q: Can old spark plugs be cleaned? Q: What is the maximum I can open or close the gap? Q: What is pre-ignition? Q: What is detonation?
