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Old 04-13-2021, 02:33 PM   #2
hiperfauto
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Join Date: Nov 2011
Location: So Cal
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Disconnect the single black wire on the O2 sensor from the harness and connect a volt meter set on the lowest DC voltage range. The sensor will output a voltage of ~0-1 volt depending on the mixture once the sensor is warm if it's working correctly. A reading closer to 0 volts indicates it's running lean, closer to .9 volts indicates rich. Somewhere around .7 volts is normal with the sensor disconnected. With the sensor connected the reading should fluctuate regularly above and below .5 volts. The sensor may have failed sending incorrect info to the ECU.

It's also possible that you're fuel pressure regulator is failing. Do you have a way of testing fuel pressure?

AMM failures are also common, especially if the air box thermostat has failed. Hot air from the exhaust manifold will eventually cook the AMM.
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