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Electronic Fuel Control Computer Test

  1. Connect a tachometer and set parking brake. Start engine and warm to normal operating temperature. Maintain engine speed of 2000 RPM. DO NOT ground carburetor switch. Connect a voltmeter to duty cycle solenoid output wire going to carburetor (Green wire).
  2. Disconnect electrical connector at oxygen sensor. DO NOT separate connector from wiring harness. Connect jumper wire between oxygen sensor harness end and good ground. Engine speed should increase at least 50 RPM and voltmeter should indicate more than 10 volts.
  3. Hold jumper wire with one hand and with the other hand, touch the battery positive terminal with jumper wire. Engine speed should decrease at least 50 RPM and voltmeter should indicate less than 5 volts. If computer fails both tests, replace it. Reconnect oxygen sensor.
CAUTION: Before performing the next test, the fuel control computer must be operating properly.
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