Air intake boot air flow meter. Porsche 911 1984-89  ›  93011035602

Air Intake Boot Air Flow Meter.

The OE Match Air Intake Boot is a replacement flexible intake duct for the Porsche 911 Carrera 3.2L from 1984–1989.

Fits:

• Porsche 911 Carrera 3.2L 1984-89

Diagram Ref No 21

Located between the engine's air flow meter and throttle body, the boot carries measured intake air towards the engine while maintaining an airtight connection between the two components.

This is an important part of the Carrera 3.2 engine-management system because the air passing through the boot has already been measured by the air flow meter. Any crack, split or loose connection in the boot can therefore allow additional air into the engine without that air being correctly accounted for by the engine-management system.

Over time, exposure to engine heat, ozone, oil vapour and repeated thermal cycling can cause the original rubber boot to harden and become brittle. Cracks can then develop, particularly around folds, hose connections and clamping areas.

Replacing a deteriorated boot helps restore a sealed intake tract, correct air metering, smooth idle quality and predictable engine response.

What This Product Does:
The Air Intake Boot provides the flexible connection between the air flow meter and throttle body.

Its main functions are to:

• Carry measured intake air towards the throttle body.
• Maintain an airtight intake path.
• Prevent unmetered air entering downstream of the air flow meter.
• Accommodate normal engine movement and vibration.
• Isolate the rigid intake components from excessive mechanical stress.
• Help maintain correct air/fuel mixture control.
• Support smooth idle and throttle response.
• Prevent dirt and contamination entering through damaged intake connections.

Symptoms Of Wear Or Failure:
Common symptoms can include:

• Rough idle.
• Unstable or hunting idle.
• High idle speed.
• Engine hesitation.
• Poor throttle response.
• Stalling at idle.
• Difficult starting.
• Reduced engine performance.
• Lean-running symptoms.
• Intake hissing noises.
• Visible cracks in the rubber.
• Splits around the folds.
• Cracks around hose connections.
• Loose fit around the air flow meter.
• Loose fit around the throttle body.
• Hardened or brittle rubber.
• Engine behaviour changing when the boot is moved during diagnosis.

Why Replacement Matters:
Replacing a cracked, hardened or leaking intake boot helps restore:

• Airtight intake sealing.
• Correct airflow measurement.
• Stable idle.
• Consistent throttle response.
• Predictable air/fuel mixture control.
• Smooth engine operation.
• Proper connection between the air flow meter and throttle body.

A new boot can also eliminate a difficult-to-diagnose source of false air on an ageing Carrera 3.2.

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

93011035602

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