Question about 1995 Nissan Quest
I'm going to guess at this but odds are I'm right...The light is connected to the vacuum at the intake manifold. When vacuum is high, it can be considered that engine is working in the most ECOnomical setting. If you mash down on the gas, or go uphill with some additional throttle application, vacuum drops because the engine is working harder (less economical) then, the light will go out, 'till conditions have changed (like going downhill). If you were to put a vacuum gauge on the engine you would be able to see the correlation. On or off, the light isn't telling you that there is anything wrong with the engine (unless it fails to come on ever, in which case you may have a vacuum hose disconnected on the engine somewhere)
Good luck with your truck!!
Posted on Jul 12, 2009
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Posted on Jan 02, 2017
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