K 2500 Truck 4WD V8-350 5.7L VIN K TBI (1995)
Throttle Body: Description and Operation
TBI Unit
TBI Operation
The TBI unit consists of three assemblies:
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Fuel meter cover with:
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Fuel pressure regulator.
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Fuel meter body with:
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Fuel injectors.
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Throttle body with:
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Idle Air Control (IAC) valve assembly.
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Throttle Position (TP) sensor.
VACUUM PORTS
The throttle body portion of the TBI unit may contain ports located above, or below the throttle valve. These ports generate the vacuum signals for
the Exhaust Gas Recirculation (EGR) valve, MAP sensor, and the EVAP canister purge system.