GM 19110532 Throttle Body Fuel Injector

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The CMFI or CSFI unit precisely controls fuel delivery to the engine, located centrally in the lower intake manifold. Key differences include the CMFI system with an adjustable aluminum air intake plenum and a single non-serviceable fuel injector unit, while the CSFI system has a non-adjustable air intake plenum, six individually controlled fuel injectors, and incorporates a Mass Air Flow sensor. The PCM monitors various engine parameters via sensors and energizes the fuel pump briefly upon ignition. Fuel is supplied by a high-pressure electric pump in the fuel tank, regulated by a fuel pressure regulator. The throttle valve controls air flow, with additional air regulated by the Idle Air Control valve. Fuel is supplied to cylinders through tubes with poppet nozzles. Upper intake manifold removal involves multiple steps, including disconnecting the battery, relieving fuel pressure, removing components, and disconnecting various connectors and hoses. Installation is the reverse of removal. The CMFI and CSFI fuel injection units are removed following a similar process, involving battery disconnection, fuel pressure relief, and removal of related components. Fuel injectors are checked and replaced if needed. The Idle Air Control (IAC) valve controls idle speed and is checked for resistance and operation. Removal and installation steps are provided, including resetting the IAC valve. The intake manifold tuning valve (CMFI) is checked and replaced as needed. Fuel injector replacement (CSFI) includes removing and reinstalling the fuel meter body. The fuel pressure regulator (CSFI) is replaced following specific steps, including O-ring replacement. Throttle body removal and installation (CSFI) involves disconnecting various components and ensuring proper cable operation. Throttle Position Sensor (TPS) checks are detailed, and replacement steps include backprobing, mounting screw removal, and proper alignment during installation.

To maintain the IAC valve, you should unplug its electrical connector, remove the valve, discard the old IAC valve gasket, clean the throttle body surface, and check the pintle dimensions.

Yes, you need to remove the air cleaner housing assembly, adapter, and gaskets.

For a non-adjustable TPS output check, connect a digital voltmeter from center terminal "8" to outside terminal "A" of the TPS connector. With the ignition on and the engine off, the TPS voltage should be less than 1.25 volts. If the voltage exceeds specifications, replace the TPS.

To replace the throttle body, first, remove the air inlet duct and disconnect the wiring connectors from the Idle Air Control (IAC) valve and Throttle Position Sensor (TPS).

All open fittings, lines, and holes must be capped or plugged to prevent dirt from entering the system when any components are removed. Additionally, when replacing components of the fuel rail and injector assembly, fuel injectors are calibrated with different flow rates and must not be interchanged with injectors from a different application.