EngineDIYCommunity Starter

Need advice: Random misfire code but engine feels fine

OldSchoolCommuterCommunity StarterMay 17, 20262024 Mazda MX-5 Miata ClubSalt Lake City
2024 Mazda MX-5 Miata Club, about 8,200 miles. Scanner showed a cylinder-specific misfire code after one rough start, but the car feels completely normal now. Plugs aren't that old. Would you swap coils to see if the code follows, or just monitor until it happens again? I'd rather test this logically than start replacing parts.
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BatteryPilot38Community StarterCommunity StarterMay 17, 2026permalink
If it were in my driveway, write temp, speed, and in-gear vs coast when the 2024 Mazda MX-5 Miata does it — then decide on parts. If the cheap test changes it, stop and reassess. A shop burned me once by skipping that step. That's my plan before I call anyone.
RustMomCommunity StarterCommunity StarterMay 17, 2026permalink
Ask what changed right before it started. Move a coil or plug on the 2024 Mazda MX-5 Miata if it's cylinder-specific and see whether the code follows. That's the branch I'd chase this week. When does it actually happen? I'm keeping receipts and dates in one folder.
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