2026-07-22 · 5 min read
Mercedes-Benz GLC Coupe Carbon Cleaning Malaysia
Mercedes-Benz GLC Coupe direct injection carbon buildup — walnut blasting at 60,000–80,000 km. Malaysia pricing.
GLC Coupe Carbon Cleaning
- Direct injection M274/M254 — carbon on intake valves at 60,000–80,000 km
- Symptoms: rough idle, misfires, sluggish acceleration
- Walnut blast cleaning for 4-cylinder
Carbon Buildup — Mercedes Direct Injection
Mercedes-Benz M270, M274, M276, and M177 engines use direct injection — intake valve carbon buildup is a known issue, especially in vehicles used predominantly for short urban trips in KL/PJ. Every 3–6 months, take a 30-minute highway run at 3,500+ rpm to burn off soft deposits. An intake carbon cleaning service (walnut blasting or chemical) costs at a specialist workshop and is recommended every 50,000–80,000 km. Signs of significant buildup: rough idle, cold-start misfires, reduced power.