S10/T10 Blazer 2WD V6-262 4.3L VIN Z (1994)
Throttle Body: Service and Repair
Throttle Body Unit
REMOVE/DISCONNECT
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Air cleaner assembly and discard gasket.
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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).
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Grommet with injector wires and lay aside.
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Throttle linkage, return spring(s), transmission control cable, and cruise control (wherever applicable).
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Cable support bracket attaching screws and bracket.
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Vacuum hoses, noting position of hoses.
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Inlet and outlet fuel lines.
NOTE Relieve fuel pressure before disconnecting fuel lines and use a back-up wrench on inlet and outlet nuts.
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Fuel line O-rings from fuel nuts and discard.
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TBI unit mounting hardware.
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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.
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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
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Manifold bore for loose parts and foreign material.
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Intake manifold sealing surface for cleanliness.
INSTALL/CONNECT
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New TBI flange (manifold mounting) gasket.
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TBI unit with mounting hardware. Tighten to 25.0 Nm (18.0 lb.ft.)
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New O-rings on fuel line nuts and coat with new engine oil. Use a back-up wrench and tighten to 27.0 Nm (20 lb.ft.).
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Vacuum hoses.
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Cable support bracket attaching screws and bracket. Tighten to 10.0 Nm (88 lb.in.)
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Throttle linkage, return spring(s), transmission control cable, and cruise control (wherever applicable).
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Grommet, with injector harness, to throttle body.
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Electrical connectors. Ensure connectors are fully seated and latched.
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Check to see if accelerator pedal is free, by depressing pedal to the floor and releasing, while engine is "OFF".
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Check for fuel leaks around fuel line nuts. Apply fuel pressure by turning ignition "ON" with engine "OFF".
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Air cleaner assembly with new gasket.
NOTE: Ensure injectors wires are not pinched between TBI and air cleaner assembly.
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Start engine check again for fuel leaks.