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Old 08-09-2008, 10:49 AM   #1 (permalink)
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Oxygen sensor gauge reading at wider throttle openings

I have one of those O2 sensor gauges. It displays a light show of LEDs bouncing back and forth when the engine is running.
Well, at wider throttle openings and low vacuum, the gauge just goes out. At that point I notice a lack of power. In this vehicle it's typically when I'm trying to maintain speed on a hill. Easing off the throttle results in the power coming back and the LEDs come back on.
I guess the ECU is going into open-loop and using a lean fuel map (or something) but why would the O2 sensor appear to stop working?
Vehicle is a Nissan with the GA15DE engine by the way.

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