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Electronic Fuel Control Computer Test

  1. Connect a tachometer and set parking brake. Start engine, warm to normal operating temperature and maintain engine speed of 1500 RPM. DO NOT  ground carburetor switch. Connect a voltmeter to duty cycle solenoid output wire going to carburetor (Green wire).
    NOTE: DO NOT  separate the solenoid connector from the wiring harness.
  2. Disconnect electrical connector at oxygen sensor and connect a jumper to a good ground. Engine speed should increase at least 50 RPM and voltmeter should indicate more than 9 volts.
  3. Hold the jumper wire with 1 hand and with the other hand, touch the battery positive terminal with hand (using your body as resistor) not the jumper wire. Engine speed should decrease at least 50 RPM and voltmeter should indicate less than 3 volts. If computer fails both tests, replace it. Reconnect oxygen sensor harness.
CAUTION: Before performing the next test, the fuel control computer must be operating properly.
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