Sunday, August 17, 2008

Fun with the Scangauge

I successfully added short term fuel trim, long term fuel trim, and lambda from the O2 sensor to the Scangauge.

I also added the second O2 sensor (after the cat), horsepower, torque, and air fuel ratio, but I didn't get to test them to see if they work.

Long term fuel trim is 12, whatever that means. Short term fuel trim was 0 or 1.

Could it be that 12 means 12%, and the injectors are 12% over their normal duty? Makes sense to me. That would be about right for 30% ethanol.

4 comments:

zenbeer said...

Fuel Trim explained.

zenbeer said...
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zenbeer said...
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zenbeer said...

"Negative trim values indicate that the engine is running too rich and oxygen sensor control is therefore making it more lean by reducing the amount of time that the injectors are open. Positive trim values indicate that the engine is running too lean and oxygen sensor control is therefore making it richer by increasing the amount of time that the injectors are open."