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7MGTE Head Gasket Reassembly - Identifying Mystery Wires, Dashpot Hose, and Cold Start Injector Plug

EngineintermediateOP Confirmed
Problem

During reassembly after a head gasket replacement on an 88 turbo manual, the owner found several disconnected wires and hoses they could not identify, including a brown wire near the knock sensor area, a small hose on the dashpot, and an electrical plug with no obvious connection point.

Unidentified brown wire found during head gasket reassemblyUnknown vacuum/hose connection on the dashpotDisconnected electrical plug with no obvious destination
Root Cause

Unfamiliarity with 7MGTE engine components during reassembly: the brown wire was an old knock sensor wire left in place when a knock sensor was previously replaced, the dashpot hose is not a vacuum line but terminates in a felt filter, and the loose electrical plug was the cold start injector connector that routes under the intake manifold.

Confidence

Low confidence — Original poster confirmed this resolved the issue

View Original ThreadPosted September 2022 on SupraForums.com