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Porsche
The Genuine Porsche Vacuum Unit is a replacement air-intake vacuum actuator used within the intake distributor system on selected early Porsche Boxster 987 models.
Fits:
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
Diagram Ref No 9
Mounted to the intake distributor assembly, the unit uses engine vacuum to operate an internal intake-air control mechanism. By moving the associated flap or linkage when commanded, the actuator helps the intake system alter airflow characteristics according to engine speed, throttle position and operating load.
Porsche uses variable intake geometry to improve the way the naturally aspirated flat-six engine breathes across different operating conditions. Correct vacuum-actuator operation helps the intake distributor change configuration when required, supporting smooth torque delivery, throttle response and efficient cylinder filling.
The actuator contains a diaphragm that converts vacuum pressure into mechanical movement. With age, the diaphragm can leak, the housing can crack, the actuator rod can stick or associated vacuum connections can deteriorate.
Replacing a faulty vacuum unit helps restore correct intake-flap operation and ensures the engine-management system can control the intake system as intended.
What This Product Does:
The vacuum unit converts vacuum pressure into mechanical movement.
It is designed to:
- Operate the intake distributor control mechanism.
- Move the associated intake flap or linkage.
- Help alter intake airflow characteristics.
- Support correct variable intake operation.
- Help optimise torque across different engine speeds.
- Support smooth throttle response.
- Maintain correct intake-system operation.
- Respond to vacuum control commands from the engine-management system.
- Replace a leaking, seized or damaged original actuator.
Symptoms Of Wear Or Failure:
Possible symptoms include:
- Reduced low- or mid-range torque.
- Flat spots during acceleration.
- Poorer throttle response.
- Engine feeling less responsive at certain RPM.
- Intake system not changing operating mode correctly.
- Check Engine Light.
- Intake-related diagnostic fault codes.
- Vacuum leak.
- Hissing noise from the intake area.
- Rough or inconsistent idle in some cases.
- Actuator rod failing to move.
- Intake flap remaining stuck in one position.
- Engine performance changing noticeably across the rev range.
- Increased emissions due to incorrect intake control.
- Vacuum actuator failing a hand-vacuum test.
Why Replacement Matters:
Replacing a faulty vacuum unit helps restore:
- Correct intake-flap movement.
- Proper intake-system switching.
- Predictable throttle response.
- More consistent torque delivery.
- Correct intake airflow control.
- Reliable vacuum operation.
- Proper engine-management functionality.
Although the engine may continue running with a failed actuator, performance and drivability may be compromised.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
98711046200
The product you are viewing cross references to these numbers
- Porsche Boxster 987 2.7L 2005-08/08
- Porsche Boxster 987 S 3.2/3.4L 2005-08/08
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Porsche additional air valve exchange surcharge 911110273U, linked to reconditioned valve 911110273X for the listed 1977–80 Porsche 911 applications. It covers the surcharge only; the valve is a separate component.
Fits
Porsche 911 2.7 / 3.0 Carrera / 3.0 SC 1977–80
Check fitment for your specific vehicle (model, year, engine) before ordering.
What This Product Does
This surcharge is associated with the reconditioning exchange arrangement for valve 911110273X. The removed component is returned for inspection to establish its suitability for reconditioning.
The associated valve supplies extra intake air during starting and early engine warm-up in CIS/K-Jetronic applications. That mechanical function belongs to the valve, not to this surcharge.
Functions
- Identifies the surcharge associated with reconditioned valve 911110273X.
- Relates to the removed component’s return and inspection within the exchange arrangement.
Technical Details
- Exchange surcharge reference: 911110273U.
- Related reconditioned valve: 911110273X.
- Associated component: additional air valve, also called an auxiliary air valve.
- Related injection system: CIS/K-Jetronic.
- Exchange unit acceptance is subject to assessment of the returned component.
Symptoms of Fault
The following concerns relate to the associated valve rather than the surcharge: difficulty with cold starting, irregular idle as the engine warms, stalling after starting, or hesitant running before operating temperature is reached. These symptoms alone do not establish that the valve is faulty.
Why Replacement Matters
If the associated valve sticks or becomes restricted, the engine may receive unsuitable airflow during starting and warm-up. Investigate intake leaks and other CIS/K-Jetronic components before deciding to replace it, because similar running problems can have several causes.
This surcharge applies only when the relevant reconditioned exchange unit is ordered.
FAQs
Does this include a replacement valve?
No. It is the surcharge associated with the reconditioned component, not an additional valve.
Which reference identifies each item?
The valve carries reference 911110273X; 911110273U identifies its associated surcharge.
Are returned components automatically accepted?
No. The removed component requires inspection to determine whether reconditioning is appropriate.
What should be checked before ordering?
Compare the original valve’s reference with the associated replacement and verify the vehicle’s model, engine, production year and VIN where needed.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
911110273U
The product you are viewing cross references to these numbers
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12 Month Warranty
Worldwide Delivery
Monday-Friday: 8.30am - 5.30pm (GMT)
Saturday: Closed
Sunday: Closed