text.skipToContent text.skipToNavigation


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.



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 specifications

Why Does It Fail?

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

What are 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 Consequences of Failure?

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

If you have questions or concerns about intake manifolds or any of your vehicle’s components, come into your local Pep Boys where we can answer any question, help you find any part, or perform any vehicle service you might need.