TP-6903 5/16a Fuel System Overview 13
1.2. Air-Fuel Mixer
Figure 1-3 Air-Fuel Mixer
The air-fuel mixer is an air-fuel metering device and is
completely self-contained. The mixer is an air valve
design, utilizing a relatively constant pressure drop to
draw fuel into the mixer from cranking to full load. The
mixer is mounted in the air stream ahead of the throttle
control device.
When the engine begins to crank it draws in air with the
air valve covering the inlet, and negative pressure
begins to build. This negative pressure signal is
communicated to the top of the air valve chamber
through vacuum ports in the air valve assembly.
The mixer is equipped with a low speed mixture
adjustment which is retained in a tamper proof housing.
The mixer has been preset at the factory and should
not be adjusted.
Important: The air-fuel mixer has been calibrated for
the engine’s emissions requirements and should never
be disassembled or rebuilt. If the air-fuel mixer is not
functioning correctly, order a replacement part. See the
engine parts catalog.
1.3. Charge Air Cooler
(KG2204T only)
Figure 1-4 Charge Air Cooler
The charge air cooler cools the compressed air/fuel
mixture before it enters the intake manifold. The cooler
intake manifold charge helps maintain emissions at the
high power level of the turbocharged engine.
1.4. Coolant Temperature Sensor
Figure 1-5 Coolant Temperature Sensor
The coolant temperature (CT) sensor is a temperature
sensitive variable resistance thermistor located in the
engine coolant passage directly underneath the air-fuel
mixer. The ECM monitors the change in resistance to
calculate engine airflow, to enrich the fuel for cold
starts, and to enable other temperature dependent
features.
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