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fuel-injector-cutaway.jpg | Hits: 11453 | Posted on: 3/19/05 | View original size (85.63 KB)

Fuel Injector Cutaway

The fuel injector nozzles are electro-mechanical devices which both meter and atomize fuel delivered to the engine. The injectors are mounted in the lower intake manifold and are positioned so that their tips direct fuel just ahead of the engine intake valves. The injector bodies consist of a solenoid, needle and valve assembly and a director/metering plate. An electrical control signal from the Electronic Engine Control unit activates the injector solenoid, allowing fuel to flow. Since the injector flow orifice is fixed and the fuel pressure drop across the injector tip is constant, fuel flow to the engine is regulated by how long the solenoid is energized. Atomization is obtained at the director/metering plate.
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Any single injector (MAF or bench) should measure 13-15 Ohms; a bank of 3 (6-cyl MAP) should measure 4-5 Ohms; a bank of 4 (V8 MAP) should measure 3-3.5 Ohms.

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