2026-10-08 · 5 min read
Mitsubishi Galant Fortis Spark Plugs Malaysia
The 4B11 engine uses 4 iridium spark plugs, with a replacement interval of every 60,000 km. NGK or Denso iridium plugs are the recommended equivalents. Given that most Galant Fortis units on Malaysian roads in 2025 are well over 100,000 km, check your service history — if spark plugs were never replaced or replaced with standard plugs, they are likely overdue. Worn plugs on a high-mileage MIVEC engine can cause misfires, rough idle, and increased fuel consumption.
The 4B11 engine uses 4 iridium spark plugs, with a replacement interval of every 60,000 km. NGK or Denso iridium plugs are the recommended equivalents. Given that most Galant Fortis units on Malaysian roads in 2025 are well over 100,000 km, check your service history — if spark plugs were never replaced or replaced with standard plugs, they are likely overdue. Worn plugs on a high-mileage MIVEC engine can cause misfires, rough idle, and increased fuel consumption.