2026-10-08 · 5 min read
Mitsubishi Galant Fortis Throttle Body Cleaning Malaysia
Throttle body carbon buildup is a predictable maintenance item on the Galant Fortis at 60,000–80,000 km intervals. Deposits on the throttle plate and bore restrict airflow at small throttle openings, causing hesitation on tip-in, a slightly rough idle, and reduced fuel economy. Cleaning involves removing the throttle body and using a dedicated throttle body cleaner. After cleaning, the car may require an idle relearn procedure. This is a straightforward service with a noticeable improvement in driveability.
Galant Fortis Throttle Body Cleaning
- Clean every 40,000 km — 4B11 PCV system can deposit oil vapour on the throttle butterfly over time
- MIVEC transition at 4,000 rpm: if throttle body is dirty, the power step from MIVEC engagement feels rough instead of smooth
- Idle relearn after throttle cleaning is required — disconnect battery for 10 minutes or use scan tool to complete adaptation