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Intake Manifold


Intake Manifold

The intake manifold distributes air entering the engine, houses the fuel injectors or carburetor and delivers the air-fuel mixture to each cylinder. Some intake manifolds also contain coolant passages, providing a route for coolant to reach all parts of the engine.

What is an Intake Manifold and how does it work

How Does it Work?

  • The intake manifold distributes air from a single entry point (the throttle body) to each cylinder
  • As the intake valve for each respective cylinder opens, air is pulled in through the intake runner and the corresponding fuel injector sprays fuel along the path, creating an air-fuel mixture that is supplied to each cylinder

How is it Made?

  • Molded plastic or cast aluminum (modern)
  • Cast iron (older models)
  • Made to match precise specifi cations

Why Does it Fail?

  • Cracking, warping or leaking
  • Wear and tear
  • Overheated engine
  • Poorly tuned engine
  • Improper or old coolant mixture

What are the Symptoms of Failure?

  • Internal or external leaks
  • Erratic or high idle
  • Poor performance
  • Hesitation and bucking
  • Check engine light may turn on
  • Visible coolant or residue on the intake

What are the Implications of Failure?

  • Reduced vehicle performance
  • Additional damage to engine
  • Decreases functionality of cooling system
  • Overheating
  • Damaged oxygen sensors and catalytic converters

How Difficult is the Install?

Difficulty Rating:

Note: Installation difficulty varies by vehicle.

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