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Old 12-26-2009, 08:15 PM   #11 (permalink)
G37Sam
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Did some researching for you

Quote:
If modifications cause the engine to run moderately lean, there will be a slight increase in fuel economy, sometimes at the expense of increased NOx emissions, much higher exhaust gas temperatures, and sometimes a slight increase in power that can quickly turn into misfires and a drastic loss of power, as well as potential engine damage, at ultra-lean air-to-fuel ratios
Oxygen sensor - Wikipedia, the free encyclopedia
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