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Oxygen Sensor Test

  1. Set parking brake and connect tachometer. Run engine at 2000 RPM and connect voltmeter to carburetor-to-computer output wire (Green). DO NOT ground carburetor switch. Hold choke blade closed. During the next 10 seconds, the voltage should decrease to 5 volts or less and maintain that level. If engine does not respond, proceed to step 2).
  2. Disconnect PCV system. During the next 10 seconds, voltage should increase to 10 volts or greater and maintain that level until vacuum hose is reconnected. If sensor fails both tests, replace it. Reconnect all hoses and wires.
NOTE: This test should not be performed for more than 90 seconds. Be sure basic timing and hot curb idle speed are set to specifications before performing these tests.
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