Spark plugs are the unsung heroes igniting your engine’s air-fuel mix. Worn plugs lead to misfires, rough idling, and fuel waste .
Modern engines usually call for iridium or platinum plugs, rated for 60,000–100,000 miles. Copper plugs, while cheap, barely last 30,000 miles .
Warning flashers:
- Rough idle or hesitation under acceleration
- Dropped fuel economy—monitor MPG over weeks
- Check-Engine light for misfire codes P0300–P0312
Gap and heat range matter—always follow your owner’s manual or parts-finder guide . And before removing old plugs, spray the boot and threads with some penetrating oil to avoid a stuck-in-hell hex .
A proper torque wrench and anti-seize compound will keep your new plugs snug without over-tightening. Expect smoother starts, reduced emissions, and a happier wallet at the pump.
