2026-10-08 · 5 min read
Mitsubishi Xpander Fuel Injector Malaysia
4A91 uses port injection — injectors spray before the intake valve, so carbon fouling is minimal. Injectors rarely need cleaning or replacement before 120,000 km. Symptoms of a failing injector: rough idle, P030X misfire codes, one cylinder running lean. Injector cleaning at 80,000 km is a precautionary service. RON97 keeps injectors cleaner than RON95 over time.
Xpander Fuel Injectors
- 4A91 port injection — injectors less prone to carbon issues than direct injection
- Injector cleaning spray via intake every 40,000 km as maintenance
- Symptoms of failing injector: rough idle, misfire, increased fuel consumption
- Use reputable fuel brands — contaminated fuel causes injector deposits