How toreplace fuel injector chevy astro 1999

Removal & Installation

1. Before servicing the vehicle, refer to the Precautions Section.
2. Relieve the fuel system pressure. Refer to the fuel system relief procedure in this section.
3. Remove engine cover.
4. Disconnect negative battery cable.
5. Remove upper manifold assembly.
6. Disconnect fuel meter body electrical connection and the fuel feed and return hoses from the engine fuel pipes.
7. Remove poppet nozzle out of the casting socket by squeezing the nozzle locking tabs together.
8. Remove fuel meter body by releasing the locktabs.
   NOTE Each injector is calibrated. When replacing the fuel injectors, be sure to replace it with the correct injector.
   
9. Remove lower hold-down plate and nuts.
10. While pulling the poppet nozzle tube downward, push with a small prytool down between the injector terminals and remove the injectors.
    
    Fig. Exploded view of the fuel meter assembly, including the injectors
    

1. Lubricate the new injector O-ring seats with engine oil.
2. Install o-rings on the injector.
3. Install fuel injector into the fuel meter body injector socket.
4. Install lower hold-down plate and nuts. Torque the nuts to 27 inch lbs. (3 Nm).
5. Install fuel meter body assembly into the intake manifold. Torque the fuel meter bracket retainer bolts to 88 inch. lbs. (10 Nm).
   CAUTION To reduce the risk of fire or injury ensure that the poppet nozzles are properly seated and locked in their casting sockets.
   
6. Install fuel meter body into the bracket and lock all the tabs in place.
7. Install poppet nozzles into the casting sockets.
8. Engage electrical connections.
9. Install new o-ring seals on the fuel return and feed hoses.
10. Connect fuel feed and return hoses and tighten the fuel pipe nuts to 22 ft. lbs. (30 Nm).
11. Connect negative battery cable.
12. Turn the ignition ON for 2 seconds and then turn it OFF for 10 seconds. Again turn the ignition ON and check for leaks.
13. Install the engine cover.