Cold Start Injector: Testing and Inspection

CHECKING NORMAL COLD START OPERATION

1. With the engine cold (coolant temperature below approx. 68°F/20°C), disable ignition coil by disconnecting electrical connector from power output stage. If engine is already warm, remove coolant temperature sensor and immerse sensor tip in ice water until sensor is sufficiently cooled, or disconnect sensor and bridge terminals of sensor harness connector with a 1/4 watt 5K ohm resistor to simulate approx. 32°F/0°C.

2. Remove cold start valve from intake manifold, leaving fuel hose and electrical connector attached, and place valve in suitable container to catch fuel.

Cold Start Injector:

3. Turn ignition switch to "start" position and crank engine for 10 seconds while observing spray from cold start valve.

^ Cold start valve should spray a uniform cone shaped mist of fuel for the period of time shown in the diagram, depending on the temperature of the coolant temperature sensor (or if 5K resistor is used in place of the temp sensor, valve should spray for approx. 3 seconds).

4. When valve stops spraying, dry off tip, disconnect electrical connector, crank engine for 10 seconds to operate the fuel pump and check for fuel leakage. Tip of cold start valve should remain dry. If not, replace valve.

Testing Cold Start Injector:

If valve did not spray, energize valve manually by momentarily applying 12V and ground using jumper wires. Valve should spray fuel while energized. If not, replace cold start valve.

WARNING: Fire hazard! Use appropriate connectors and long jumper wires so as not to create any sparks near the valve while testing. The mist of fuel can ignite very easily.

NOTE: If valve operates when energized using jumper wires, but did not operate while cranking engine, there is a problem in the electrical wiring or the ECU. Refer to COMPUTERIZED ENGINE CONTROLS.