Intake Manifolds  You: A Beginner’s Guide To Replacing a Fuel Injected Intake Manifold

Fuel-injected engines use intake manifolds, like the SBC fuel injection intake, to deliver a precise air-fuel combination for optimal combustion and performance. The intake is the transportation route for the air-fuel mixture to each cylinder. The manifold may house other critical engine components, such as the throttle body, sensors, and vacuum ports. 

Ultimately, the intake manifold is crucial to engine power and performance. If the manifold is failing, you may notice several signs, such as power loss, rough idle, hesitation on the gas,  stalling, noises, and fluid leaks. If your vehicle is experiencing any of these issues, you may need to install a new intake manifold.

Choosing Your Intake

When selecting a new intake manifold, you have two options: single-plane or dual-plane. A single-pane intake manifold is best for racing and performance. It maximizes airflow for high-RPM power. The main drawback is that it may feel sluggish at city speeds because it creates less torque at lower speeds.

A dual-plane intake manifold offers less peak power than a single-plane but achieves a smoother ride for everyday performance. The design enhances low-end torque, making it ideal for daily drivers and street cars. Also, dual-plane intakes are more DIYer-friendly, with a more straightforward bolt-on design.

The best intake manifold for you depends on your driving style and expectations. If you are a racer, go with the single-plane. If you are a city driver looking for a comfortable commute, go with the dual-plane.

Installing Your Manifold

For anyone who has installed a camshaft kit, swapping out an intake manifold should be a piece of cake. Before you start, you should gather and organize your tools and supplies. Then, before removing the manifold, disconnect the battery and drain the coolant for safety and easier access. 

Now, detach and label all hoses, sensors, and vacuum lines. Then, carefully remove the manifold bolts. You want to do this slowly to avoid gasket damage. Once the old manifold is removed, clean the mounting surface.

After removal and cleaning, you can install the new gasket and position and secure the new manifold. Tighten the intake manifold bolts evenly and ensure a secure fit. Then, reattach the hoses, sensors, and vacuum lines, confirming you read your labels and follow proper routing. Finally, double-check all connections to provide a secure and tight fit.

With the new intake manifold in place, you can reconnect the battery and refill the coolant. Next, start the engine and let it idle. Check for leaks and ensure the device is running correctly.

Installing an intake manifold is unlike swapping out old tires for drag radials. There is a process you must follow and a certain skill level you should possess. If you are confident in your abilities, feel free to try the installation independently. To protect your investment and safety, it is usually best to work with a licensed mechanic. Contact a local mechanic to schedule the installation. If you insist on trying the installation, contact a local auto parts store to find a proper intake manifold replacement for your vehicle.