Cadillac 17112407 Fuel Meter Body

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The TBI unit is attached to the top of the intake manifold by several bolts. These fasteners can sometimes work loose from vibration and temperature changes during normal engine operation and cause a vacuum leak. If you suspect that a vacuum leak exists at the bottom of the throttle body, obtain a length of hose. Start the engine and place one end of the hose next to your ear as you probe around the base with the other end. You will hear a hissing sound if a leak exists, but be careful of hot or moving engine components. Remove the air cleaner assembly, tagging each hose to be disconnected with a piece of numbered tape to make reassembly easier. Locate the mounting bolts at the top of the throttle body. Decide what special tools or adapters will be necessary, if any, to tighten the fasteners. Tighten the bolts to the torque, but don't overtighten them, as the threads could strip. If, after the bolts are properly tightened, a vacuum leak still exists, the throttle body must be removed and a new gasket installed. After tightening the fasteners, reinstall the air cleaner and return all hoses to their original positions.

To maintain the Tube Module Assembly, you should remove the tube module assembly attaching screws, discard the old gasket, and clean any residual gasket material from the throttle body. Then, install a new tube module gasket and the tube module.

Fuel pressure regulator (CSFI) replacement involves specific steps, including O-ring replacement.

During this maintenance, you should check for leaks after installing the fuel meter body assembly, fuel inlet and outlet nuts with new gaskets, and fuel inlet and return line threaded fittings with new O-rings.

After installation, the fuel lines and fuel meter body should be checked for fuel leakage.

The upper intake manifold and fuel meter body can be removed by taking out the ignition coil/module assembly and EVAP purge valve, and then carefully removing the upper intake manifold.

Special tools or adapters may be necessary to tighten the mounting bolts properly.