Air inlet ducts on most fuel injected engines carry air from the air cleaner to the throttle body. Sometimes, the air flow sensor is mounted in this duct. The duct is usually made of plastic to reduce weight.Clamps at duct fittings prevent leakage and keep airborne dirt out of the engine. Where ducts are placed between the air flow sensor and the intake manifold leakage could upset the air-fuel ratio. Fig.3.25 also shows where to look for components just discussed in the chapter. Note the locations of the fuel pressure regulator, fuel rail or manifold, throttle cable, throttle body, air bypass valve, cold start valve, and air flow sensor.
This air intake uses flexible duct to move air from air cleaner into intake manifold. Note location of air flow sensor, Leaks in duct could upset air-fuel ratio. (Fiat)
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