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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 connector from the wiring harness.
  2. Disconnect electrical connector at oxygen sensor and connect a jumper wire to the harness end. Connect the other end of the 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 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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