🟡 Mazda CX-5 SkyActiv-G 2.0 GDI intake valve carbon deposit

Rough idle, hesitation on acceleration, and occasional misfire on the Mazda CX-5 2.0 SkyActiv-G petrol engine after 80,000-100,000 km. As a direct injection engine, the intake valves are not washed by fuel and accumulate carbon deposits from crankcase blow-by gases. An intake cleaning service using chemical induction cleaner or walnut blasting restores smooth running. Mazda recommends using premium grade fuel to reduce deposit formation.