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Porsche // 356 (1950-1965) // 356A 1955-59
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- Porsche 997 MK1 GT3 / GT3 RS 2007-09
The Genuine Porsche Control Line (Part Number: 99711016194) is an engine control system component associated with Porsche's vacuum-operated control arrangements.
Fits:
- Porsche 997 MK1 GT3 2007-09
Diagram Ref No 10
Porsche uses vacuum control lines in selected high-performance 911 engines to transmit vacuum between control valves, actuators and other components. These systems allow the engine management system to operate functions such as variable intake or exhaust-related mechanisms, depending on the particular engine configuration.
The 997-generation GT3 and GT3 RS engines use a network of control lines, change-over valves, connecting pieces and vacuum actuators. These components work together to operate the relevant engine control systems under different driving conditions.
A correctly functioning control line provides a secure, airtight passage through which vacuum can be transmitted. This allows the associated actuator to respond to the control system as intended.
Over time, engine vacuum lines may deteriorate because of prolonged heat exposure, vibration, ageing or physical damage. Cracked tubing, loose connectors and damaged fittings can cause vacuum leakage or prevent a controlled mechanism from operating correctly.
A damaged control line may contribute to reduced actuator response, inconsistent operation of vacuum-controlled components or engine management faults.
Replacing a defective line with the correct Genuine Porsche component helps restore the intended vacuum circuit, maintain reliable actuator operation and preserve the original engine control arrangement.
This component may be relevant to engine servicing, vacuum leak investigations and specialist Porsche GT engine maintenance.
What This Product Does:
A vacuum control line provides a passage through which vacuum is transmitted between components of an engine control system.
On the Porsche 997 GT3, vacuum-operated systems use change-over valves and actuators to control specific engine functions.
The control valves respond to the engine management system by directing vacuum to the appropriate actuator.
A securely connected control line is necessary for this operation because vacuum leakage can reduce the force available to move the controlled mechanism.
Its main functions include:
- Transmitting vacuum: Provides an airtight passage between connected control components.
- Supporting actuator operation: Allows the relevant vacuum-operated mechanism to respond to control signals.
- Maintaining vacuum integrity: Helps prevent air leakage within the control circuit.
- Supporting change-over valve operation: Works with the relevant control valve to direct vacuum where required.
- Maintaining consistent engine system response: Helps vacuum-controlled components operate according to their intended sequence.
- Supporting performance-related control functions: Contributes to correct operation of the system to which the line is connected.
- Maintaining correct routing: Preserves the specified installation arrangement around the engine.
- Supporting system diagnosis: Provides a defined vacuum connection that can be checked for leaks or restrictions.
- Preserving factory functionality: Maintains the original Porsche vacuum control arrangement.
The control line is a passive component. It does not generate vacuum or electronically control an actuator by itself.
Symptoms Of Wear Or Failure:
Engine vacuum control lines operate in an environment exposed to high temperatures, vibration and repeated heating and cooling cycles.
Over time, the line and its connections may become brittle, loose or damaged.
Common symptoms of a worn or defective control line include:
- Visible cracking: Ageing or excessive heat exposure may cause the line to develop splits.
- Brittle or hardened material: Deterioration may reduce flexibility and increase the likelihood of breakage.
- Vacuum leakage: Cracks or damaged connections may allow air into the vacuum circuit.
- Hissing noises: A significant vacuum leak may produce an audible hissing sound.
- Loose connections: Deteriorated hose ends or fittings may prevent secure attachment.
- Disconnected control line: A detached line may prevent the associated actuator from receiving vacuum.
- Kinked or crushed tubing: Incorrect routing or physical damage may restrict the vacuum passage.
- Damaged connectors: Broken connecting pieces may interrupt vacuum transmission.
- Inconsistent actuator operation: A vacuum-operated mechanism may fail to respond reliably.
- Reduced performance in certain operating conditions: A faulty vacuum-controlled intake or exhaust mechanism may affect the engine's intended operating characteristics.
- Engine management warning lights: Certain vacuum control faults may trigger diagnostic codes, depending on the system.
- Intermittent control system faults: A small leak may cause inconsistent operation under changing conditions.
- Incorrect component positioning: A vacuum actuator may remain in its default position when the required vacuum is unavailable.
- Damage during engine maintenance: Control lines can be cracked, displaced or broken while neighbouring components are removed.
Why Replacement Matters:
Replacing a cracked, leaking or restricted vacuum control line is important for maintaining the correct operation of the associated engine control system.
A defective line can prevent vacuum from reaching the relevant actuator, leaving the controlled mechanism unable to operate as intended.
On a performance-focused Porsche GT engine, correct operation of vacuum-controlled components is important for maintaining the manufacturer's specified engine and exhaust system behaviour.
Installing the correct Genuine Porsche replacement Control Line helps to:
- Restore vacuum integrity: Replace cracked or leaking sections within the control circuit.
- Support reliable actuator operation: Allow the relevant component to receive the necessary vacuum.
- Maintain correct system response: Restore operation of the associated change-over valve and actuator arrangement.
- Reduce intermittent faults: Address inconsistent control caused by confirmed vacuum leakage.
- Prevent further deterioration: Replace ageing or brittle components before complete failure.
- Maintain correct component routing: Preserve the intended Porsche installation arrangement.
- Support engine performance: Help the relevant controlled system operate according to its original design.
- Prevent unwanted air leakage: Restore a secure connection within the vacuum circuit.
- Support fault diagnosis and repair: Replace damaged pipework identified during vacuum testing.
- Preserve vehicle originality: Maintain the factory vacuum control configuration.
- Support specialist engine servicing: Provide replacement line components during GT engine maintenance.
- Maintain Genuine Porsche specifications: Use the correct original equipment reference once fitment has been confirmed.
Replacement is particularly recommended when inspection identifies visible cracking, damaged connectors, loss of vacuum or restricted tubing.
When replacing the line, adjoining hoses, change-over valves and actuators should also be inspected to ensure there are no additional faults.
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
99711016194
The product you are viewing cross references to these numbers
- Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
- Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
- Porsche 356 1950-55
- Porsche 356A 1955-59
- Porsche 356B 1959-63
- Porsche 356C 1963-65
Fits:
Porsche 911 - 1974 to 1989
Porsche 964 - 1989 to 1994
Porsche 993 - 1994 to 1998
Porsche 914 - 1970 to 1976
Porsche 924 - 1980 to 1985
Porsche 944 - 1982 to 1991
Porsche 968 - 1992 to 1995
Porsche 928 - 1978 to 1995
Click 'Zoom in' for large parts diagram.
Diagram ref no 29
Related reference numbers
Related, superseded, cross reference or alternative numbers for comparison.
PCG0235692
The product you are viewing cross references to these numbers