2026-08-20 · 5 min read
Audi A7 Carbon Cleaning Malaysia
A7 4G 3.0T supercharged: port injection — NO carbon concern. A7 4K 3.0T turbo EA839: direct injection — carbon buildup at 60,000–80,000 km. Walnut blast for 6-cylinder V6: more complex than 4-cylinder — RM 1,100–1,800. Symptoms: rough idle from cold, hesitation above 4,000 RPM. 4K: VCDS lambda adaptation as secondary indicator.
A7 4G 3.0T supercharged: port injection — NO carbon concern. A7 4K 3.0T turbo EA839: direct injection — carbon buildup at 60,000–80,000 km. Walnut blast for 6-cylinder V6: more complex than 4-cylinder — RM 1,100–1,800. Symptoms: rough idle from cold, hesitation above 4,000 RPM. 4K: VCDS lambda adaptation as secondary indicator.