TOYOTA 90109-08188 Intake Manifold Stud

This genuine TOYOTA (part number: 90109-08188) intake manifold stud is an OEM-quality fastener engineered specifically for the secure and stable attachment of the engine intake system. The primary function of intake manifold studs is to maintain a constant and uniform clamping force between the intake manifold and the cylinder head, ensuring proper gasket sealing and preventing unmetered intake air leaks.

Technical Features and Specifications:

• Manufacturer: TOYOTA (Genuine OEM part)
• Part Type: Intake manifold stud / mounting bolt
• Material Composition: High-tensile, premium steel alloy engineered to withstand high operating temperatures and engine vibrations.
• Surface Treatment: Specialized anti-corrosion coating to protect against environmental factors and rust formation.
• Thread Design: Precision-machined threading for accurate and safe torque tightening.

Role and Importance of the Intake Manifold Stud:

Secure fastening of the intake manifold is critical for maintaining an optimal air-fuel mixture. If a stud stretches, shears, or loosens, air leaks can occur past the intake manifold gasket. This can cause rough idling, loss of engine power, increased fuel consumption, and trigger engine control unit (ECU) fault codes.

Common Symptoms of Failure or Wear:

• Thread Damage: Frequently caused by improper torque application (overtightening).
• Mechanical Damage or Breakage: Due to thermal expansion cycles and metal fatigue, aged fasteners can become brittle and fracture.
• Severe Corrosion: Complicates removal and can lead to structural weakness.

When removing the intake manifold or replacing the gasket, manufacturers strongly recommend replacing the mounting bolts and studs to guarantee accurate tightening torque and a leak-free seal.