7M-GE Air Cleaner Throttle Valve PCV Hose Blow-By Gas Fresh Air 7M-GTE Air Cleaner PCV Hose Throttle Valve EC-5305, EC-33561 To reduce HC emissions, crankcase blow-by gas (HC) is routed to the intake manifold for combustion in the cylinders. 7M-GE 7M-GTE EC2009 EC2366 INSPECTION OF PCV HOSE AND CONNECTIONS 1. VISUALLY INSPECT HOSE AND CONNECTIONS Check for cracks, leaks or damage. 2. CLEAN ORIFICE(S) Clean off any gum deposits in the orifice(s) with solvent and blow out with compressed air. 7M-GE Orifice Air Orifice FI3471 7M-GTE Air Orifice EC2357