Discontinued ISCV/IACV Hoses Replacement - Silicone Kit or Auto Parts Store Hoses

Fuel Systembeginner✓ Community Verified

Problem

The OEM rubber hoses connecting the Idle Speed Control Valve (ISCV/IACV) become hard and brittle after 10-15 years of underhood heat exposure, cracking when removed. Toyota has discontinued the replacement hoses (particularly the #2 hose and the 7MGE #1 hose, part number 17347-42010), making OEM replacement impossible.

ISCV hoses hardened like plasticHoses crack or break during removalOEM replacement hoses unavailable from Toyota or other sourcesPotential vacuum leaks and idle problems from cracked hoses

Root Cause

OEM rubber ISCV hoses degrade from prolonged underhood heat exposure (especially on turbocharged 7MGTE engines), becoming brittle and cracking after approximately 10-15 years. Toyota has discontinued the replacement parts.

Confidence

Moderate confidence — Multiple community members agreed on this solution

View Original Thread →Posted April 2023 on SupraForums.com