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Home >> GMC >> 1990 >> Forward Control 4.3 Z, Standard >> Repair and Diagnosis >> Engine Performance >> Remove, Overhaul & Install >> Engine Controls - Remove/Install/Overhaul >> Fuel System (Gasoline) >> Throttle Body >> Removal

Throttle Body: Removal

  1. Disconnect air cleaner (THERMAC) hose from engine fitting (if equipped). Remove air cleaner, adapter, and gasket. Disconnect electrical leads at IAC valve, throttle position sensor, and fuel injector(s).
  2. Relieve fuel pressure as previously described. Disconnect fuel lines from throttle body. Discard fuel line "O" rings. Disconnect grommet with wires from throttle body.
    NOTE: On model 220 TBI units, squeeze plastic tabs on injectors and pull connector straight up.
  3. Disconnect throttle linkage, return spring and cruise control linkage (if equipped). Label and disconnect all vacuum hoses from throttle body. Remove throttle body mount bolts/nut. Remove throttle body.
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