Actuator valve. Porsche 996 / 997.1 / 987.1 Cayman

Variable Valve Timing Solenoid (VVT) - Sold each, 2 required per car
The Variable Valve Timing (VVT) Solenoid is a high-precision engine control component designed to manage oil flow to the camshaft system, optimizing valve timing based on engine load, RPM, and driving conditions.
By constantly adjusting the camshaft position, this advanced solenoid improves engine efficiency, performance, and emissions.
It ensures that your Porsche engine — or equivalent high-performance system — delivers maximum torque, smoother idling, and improved fuel economy under all conditions. Engineered to meet exacting performance standards, this solenoid guarantees long-term reliability and a precise fit for seamless integration into your engine’s variable valve timing system

Fits:
Porsche 996 C2 3.6L 09/01-2005 (for engine code M96.03)
Porsche 996 C4 3.6L 09/01-2005  (for engine code M96.03)
Porsche 996 C4S 3.6L 09/01-2005  (for engine code M96.03)

Porsche 997 MK1 Carrera 2 3.6L 2005 (up to engine number 695 08637)
Porsche 997 MK1 Carrera 2S 3.8L 2005 (up to engine number 685 11779)
Porsche 997 MK1 Carrera 4 3.6L 2005 (up to engine number 695 08637)
Porsche 997 MK1 Carrera 4S 3.8L 2005   (up to engine number 685 11779)
Porsche 997 MK1 TURBO 2007-09
Porsche 997 MKII GT2 RS 2011-13

Diagram Ref No 40

What It Does
The VVT solenoid (also called a camshaft adjustment valve or oil control solenoid) plays a vital role in modern engine performance and efficiency.

Core Functions:

• Regulates the flow of pressurized oil to the camshaft phaser or actuator.
  
• Adjusts valve timing dynamically to match engine speed, load, and throttle input.
  
• Optimizes power delivery, fuel consumption, and emission control.
  
• Ensures smooth idle and responsive acceleration.
  
• Helps reduce exhaust emissions and improve combustion stability.

When working correctly, it keeps the engine running at peak precision, balancing performance and efficiency seamlessly.

Why VVT Solenoids Fail
Over time, the variable valve timing solenoid can degrade due to contamination, wear, or electrical faults.

Common causes include:

• Oil contamination or sludge buildup blocking the internal oil control passages.
  
• Low oil quality or irregular oil changes, which reduce hydraulic efficiency.
  
• Electrical faults within the solenoid connector or wiring harness.
  
• Mechanical sticking of the plunger or valve spool, preventing proper timing adjustment.
  
• Prolonged engine overheating causing internal seal failure.

Failure Symptoms:
Check Engine Light (CEL) or camshaft timing fault codes. Rough idle or engine stalling. Reduced power, sluggish acceleration, or poor fuel economy. Rattling noise from the timing area. Higher emissions or failed MOT/inspection.

Why It Should Be Replaced
Replacing a worn or faulty VVT solenoid restores your engine’s optimal performance and efficiency.

Key Benefits of Replacement:

• Restores precise valve timing for consistent torque and smooth power delivery.
  
• Improves fuel economy by optimizing combustion under all loads.
  
• Eliminates rough idle and hesitation during acceleration.
  
• Prevents costly engine damage caused by improper timing or lubrication.
  
• Reduces emissions and ensures compliance with modern environmental standards.
  
• Ensures long-term reliability and consistency under demanding driving conditions.

A fresh VVT solenoid returns your vehicle to the refined performance level it was designed to deliver, ensuring precision control and reliability mile after mile.

Advantages at a Glance

• Precision oil flow control for accurate camshaft timing
• Improved engine performance and throttle response
• Smoother idle and reduced vibration
• Enhanced fuel efficiency and reduced emissions
• Durable construction with long lifespan
• Plug-and-play compatibility for quick installation
• Developed to deliver original-quality performance at excellent value       

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

99610530105

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