Caprice Wagon V8-350 5.7L (1994)
second of the test. The voltage reading should be within range (see example). The voltage reading may increase throughout the test as the injector
windings warm and the resistance changes. An erratic voltage reading (one that jumps up and down) indicates an intermittent connection within the
fuel injector.
4. To check the mechanical (fuel delivery) portion of the fuel injector, perform an injector balance test.
CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. The first second of the voltage reading may be inaccurate due to initial current surge, therefore, record the lowest voltage displayed after the first
second of the test. The voltage reading may increase throughout the test as the injector windings warm and the resistance changes. An erratic
voltage reading (one that jumps up and down) indicates an intermittent connection within the fuel injector.
2. From recorded voltages (see example), identify the highest voltage reading recorded (other than those above 9.5 volts). Subtract all other voltages
from the highest voltage recorded The subtracted value for any injector must not exceed 0.6 volt
3. To check the mechanical (fuel delivery) portion of the fuel injector, perform an injector balance test.
CHART TEST DESCRIPTION
Number(s) below refer to circled number(s) on the diagnostic chart.
1. Engine cool down period (10 minutes) is necessary to avoid irregular fuel pressure readings due to "Hot Soak" fuel boiling.
2. Energize tester one time and record pressure drop at the lowest point (Disregard any slight pressure variations).
3. If the pressure drop of all injectors is within 10 kPa (1.5 psi) of the average fuel pressure drop, the injectors are flowing properly. The actual
amount of pressure drop is calculated by subtracting the second pressure reading from the first pressure reading.
