How Fuel Injectors Work

Discussion in '2003 - 2008 Toyota Corolla' started by speedkar9, Jun 5, 2018.

  1. speedkar9

    speedkar9 New Member

    I took apart the fuel injection system on my Corolla to see what's inside and how it works. I made a short video explaining what's inside a port injected fuel injector:

    Here's a brief explanation:

    The fuel injectors are located on the fuel rail on the intake side of the engine:

    This is the fuel rail removed:

    One of the benefits of port injection is the valves are cleaned by the gasoline as the engine runs, you can clearly see where the carbon deposit ends:

    Injector removed:

    I hooked it up to a washer tank to see what the spray is like:

    Inside is a coil that controls a small pintle valve. The valve opens and closes the sprayer, and that's what controls the flow of fuel:


    Here's a cross-section of what's going on inside:

    Other engines have direct injection, where the injector is situated inside the combustion chamber. This is better for fuel economy and power, but it doesn't keep the valves clean and can cause carbon buildup:

    beach bum likes this.
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  3. 3ddie @rana

    3ddie @rana New Member

    Awesome !

    3ddie @
  4. Rinconrolla

    Rinconrolla New Member

    Nice video !!!

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