Throttle Body Unit

REMOVE or DISCONNECT

1. Relieve fuel system pressure.
2. Negative battery terminal
3. THERMAC hose from engine
4. Air cleaner, adapter and gaskets. Discard gasket.
5. Electrical connectors to TPS sensor, IAC valve, Injector(s).
6. Gromet with wires from throttle body.
7. Throttle linkage, return springs, transmission control cable and cruise control cable when applicable.
8. Vacuum hoses, noting positions of hoses.
9. Inlet and outlet fuel line nuts.
10. Fuel line O-rings and discard.
11. TBI mounting hardware.
12. TBI unit from intake manifold.
13. Reverse procedure to install using new O-rings and gasket.



*** THIS PROCEDURE HAS BEEN UPDATED BY TSB # 89-34-6E, dated 11/88

On vehicles using the model 700 TBI, when reinstalling the TBI unit, tighten the attaching bolts/studs to 17.0 Nm (13.0 ft lbs).

Anytime the TBI attaching bolts/studs to the intake manifold are installed or retightened, the fuel meter body attaching screws should also be retightened. Tightening the TBI attaching bolts may cause the fuel meter body gasket to compress and allow the fuel meter body attaching screw to loosen.

Tighten fuel meter body attaching screws to 6.0 Nm (53 in lbs).

If the fuel meter body is removed from the TBI unit, be sure to apply threadlocking compound to the fuel meter body attaching screws. Most GM TBI repair kits include a small vial of threadlocking compound. If this is not available, use Loctite 262 or equivalent. It is not necessary to apply threadlocking compound to the fuel meter body attaching screws if they are being retightened only, and the TBI attaching bolts/studs have already been tightened to the proper torque.