Engine crankcase breather hose. Porsche 928 S4/GT/GTS 1987-95  ❭  92811017409

Engine crankcase breather hose, Plenum to MAFS Connector.
OE Match engine crankcase breather hose for Porsche 928 S4, GT, and GTS models from 1987 to 1995. This replacement hose runs from the plenum to the MAFS connector, helping maintain correct crankcase ventilation, intake sealing, and smooth engine operation.

Fits:
Porsche 928 S4 / GT 1987 - 1991
 * Engine code: 2841 / 2842 / 2847

Porsche 928 GTS 1992 - 1995
 * Engine code: 2849 / 2850

Diagram ref no 11

The crankcase breather hose routes crankcase vapours from the engine ventilation system into the intake system for controlled recirculation. A correctly sealed hose helps prevent vacuum leaks, unmetered air entry, oil vapour escape, and poor running caused by damaged or split breather hoses.

Functions
•  Replaces the engine crankcase breather hose
•  Fits from the plenum to the MAFS connector
•  Supports correct crankcase ventilation routing
•  Helps maintain intake system sealing
•  Helps prevent vacuum leaks and unmetered air entry
•  Supports smooth idle, throttle response, and reliable engine running
•  Suitable for intake service, breather system repair, or engine bay restoration
•  OE Match replacement for Porsche 928 S4, GT, and GTS breather system maintenance.

Why Replace This Part?
Crankcase breather hoses can harden, crack, split, collapse, or become oil-soaked due to age, heat, oil vapour exposure, and engine bay conditions. A damaged hose may cause rough idle, hesitation, vacuum leaks, intake air leaks, oil vapour smell, oil mist residue, or incorrect air metering. Replacing the hose helps restore correct breather system function and intake performance.

When to Replace This Part
•   Breather hose is cracked, brittle, split, collapsed, or leaking
•   Rough idle, hesitation, or poor running is present
•   Vacuum leak or unmetered air symptoms are detected
•   Oil vapour smell or oily residue is visible around the hose
•   Plenum, MAFS connector, or intake system service is being carried out
•   Engine crankcase breather system maintenance is in progress
•   Vehicle is undergoing Porsche 928 engine bay restoration or refresh.

Where it fits on the car
This hose fits within the engine intake and crankcase breather system, running from the plenum to the MAFS connector on Porsche 928 S4, GT, and GTS models.

Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.

92811017409

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