AUTOOL HTS558 is a de-carbon device for intake valve cleaning, whose working principle is to blast the walnut media into the intake valve through high-pressure airflow. The carbon deposits on the valve and cylinder wall impacted down. The walnut media and carbon deposit mixture can be recycled through special joints. It can deeply remove the sticky carbon deposits on the intake manifold, intake valve and exhaust valve. Effectively solve the problems of unstable idling, insufficient air intake, i