Astro Van L AWD V6-262 4.3L VIN Z (1994)
Throttle Body: Service and Repair
Throttle Body Unit
TBI Mounting
REMOVAL
1.
Remove air cleaner assembly and discard gasket.
2.
Disconnect electrical connectors from idle air control valve (IAC), throttle position sensor (TPS), and fuel injectors (squeeze plastic tabs on
injector connector and pull straight up).
3.
Remove grommet with injector wires and lay aside.
4.
Disconnect throttle linkage, return spring(s), transmission control cable, and cruise control (wherever applicable).
5.
Disconnect vacuum hoses, noting position of hoses.
6.
Disconnect inlet and outlet fuel lines.
NOTE: Relieve fuel pressure before disconnecting fuel lines and use a back-up wrench on inlet and outlet nuts.
7.
Remove fuel line O-rings from fuel nuts and discard.
8.
Remove TBI unit mounting hardware.
9.
Remove TBI unit.
NOTE: To prevent damage to the throttle valve, it is essential that the unit be placed on a holding fixture, before performing service.
10. Remove TBI flange (manifold mounting) gasket.
NOTE: Before removing old gasket from surface of intake manifold, stuff the manifold opening with a clean rag to prevent material from
entering the engine.
INSPECT
^ Manifold bore for loose parts and foreign material.
^ Intake manifold sealing surface for cleanliness.
INSTALLATION
1.
Install new TBI flange (manifold mounting) gasket.
2.
Install TBI unit with mounting hardware. Tighten to 16.0 Nm (12.0 lb.ft.)
3.
Install new O-rings on fuel line nuts and coat with new engine oil. Use a back-up wrench and tighten to 26.0 Nm (20.0 lb.ft.).
4.
Connect vacuum hoses.
5.
Connect throttle linkage, return spring(s), transmission control cable, and cruise control (wherever applicable).
6.
Install grommet, with injector harness, to throttle body.
7.
Connect electrical connectors. Ensure connectors are fully seated and latched.
8.
Check to see if accelerator pedal is free, by depressing pedal to the floor and releasing, while engine is "OFF".
9.
Check for fuel leaks around fuel line nuts. Apply fuel pressure by turning ignition "ON" with engine "OFF".
10. Install air cleaner assembly with new gasket.
NOTE: Ensure injectors wires are not pinched between TBI and air cleaner assembly.
11. Start engine check again for fuel leaks.
