See Figure 1
During cold engine starting, the cold start injector is used to supply additional fuel to the intake manifold to aid in initial start-up. The opening and closing of the injector is determined by the Start Injector Time Switch. when the engine coolant temperature falls below a certain point, the switch is tripped, then opens the cold start injector. As the engine coolant warms up, the switch will eventually close the injector.
REMOVAL & INSTALLATION
- Disconnect the negative battery cable.
- Remove the cold start injector union bolt(s) on the delivery pipe.
Before removing the union bolt, place a suitable container under it to catch any escaping fuel.
- Disconnect the wiring connector at the injector.
- Unscrew the two mounting bolts, then remove the cold start injector from the air intake chamber.
- Installation is in the reverse order of removal.
Always use a new gasket when reinstalling the injector.
- Start the engine and check for any leaks.
See Figures 2, 3, 4 and 5
- Drain the cooling system.
- Remove the air intake connector at the throttle body.
- Tag and disconnect all hoses from the air intake chamber, and all hoses from the throttle body which may interfere in intake chamber removal.
- Tag and disconnect the accelerator linkage and cable from the throttle body.
- Tag and disconnect the cold start injector wire, throttle position sensor wire, and the two wiring connectors near the distributor.
- Remove the air intake chamber stay and the vacuum pipe sub-assembly.
- Loosen the EGR pipe connecting nut. Disconnect the cold start fuel hose from the delivery pipe.
- Remove the air intake chamber from the cylinder head, and remove the cold start injector from the intake chamber.
- Installation is in the reverse order of removal. Always use new gaskets under the cold start injector.
- Start the engine and check for leaks.
- Unplug the wiring connector and remove the cold start injector from the air intake chamber.
Do not disconnect the fuel line.
- Using Special Tool 09843-30011, connect one end to the injector and the other to the battery.
- Remove the rubber cap from the Fuel Pump Check terminal and short both terminals with a wire.
- Hold the injector over a suitable container, then turn the ignition switch to the ON position. Do not start the engine.
- Check that the fuel splash pattern is even and V-shaped.
- Disconnect the test probes from the battery and check that the fuel does not leak from the injector tip any more than one drop per minute.
- Remove the Special Tool and reinstall the cold start injector.
- Check the resistance of the injector. It should be 3-5 ohms.
- If the cold start injector did not operate properly in any of these tests, it will require replacement.