2026-07-22 · 5 min read
Mercedes-Benz GLA — 积碳清洗
GDI intake valve carbon buildup — identical situation to A-Class and CLA. By 60,000–80,000 km the buildup causes rough idle and reduced throttle response. Walnut shell blasting is the correct method (). Inspect at 60,000 km; clean as needed.
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.