2026-09-15
Lexus LS 460 Direct Injection Carbon Buildup – Walnut Blasting Malaysia
The LS 460's 1UR-FSE uses direct injection — significant intake valve carbon accumulates from 80,000 km. Walnut blasting (V8, complex job). Symptoms: rough idle, slightly reduced performance. LS 500h's V35A-FTS uses bi-injection (port + direct) — less severe carbon buildup. Schedule carbon service at 80,000–100,000 km for LS 460.
LS 460 D-4S Carbon Buildup
The LS 460 1UR-FSE uses D-4S dual injection — port + direct injection. Like the IS 250, the port injection component keeps valves cleaner than pure DI, but carbon can accumulate on valve stems by 80,000–100,000 km, especially on a high-mileage flagship that may have seen extended oil intervals. Walnut blasting every 80,000 km is recommended. The LS 500h does not have this issue due to its hybrid drivetrain and more modern injection system.