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 opens the cold start injector. As the engine coolant warms up, the switch will close the injector.
See Figures 1 and 2
- Disconnect the cold start injector wiring.
- Using an ohmmeter, check the resistance of the injector; the reading should be 2-4 ohms.
- If the reading does not come within specifications, replace the cold start injector.
- Attach the cold start injector wiring.
REMOVAL & INSTALLATION
See Figure 3
- Disconnect the negative battery cable.
- Safely relieve the fuel pressure. Remove the cold start injector union bolt(s) on the delivery pipe. Before removing the union bolt, place a suitable container and shop towel under it to catch any escaping fuel.
- Disconnect the wiring at the injector.
- Unscrew the mounting bolts and then remove the cold start injector from the air intake chamber.
- Using a new gasket, install the cold start injector into the intake chamber. Tighten the mounting bolts to between 48-69 inch lbs. (5-8 Nm).
- Connect the wiring to the injector.
- Attach the delivery pipe to the injector.
- Connect the negative battery cable.
Always use a new gasket when reinstalling the injector.
- Start the engine and check for any leaks.