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My theory on how the MAF sensor cleaning cures the code 1128 & 1130 is pretty simple.. the element,( the paper clip lookin' thingy..), sits in the intake air flow..
the MAF sensor is an accurate current source device in its simplist terms.. the sensor sends a current through the element which generates heat.. now as air flows over the element, it removes heat from the element which causes an increase in current to maintain the element temperature.. more air = more current..
The ECM uses the current measurement to calculate the air flow into the engine.
What I think happens to the MAF is it gets a coating of dirt, the contaminate acts as an insulator.. once it gets thick enough, it skews the airflow measurement, in other words, the element does not see all the airflow.. the result is a reading of lower airflow reaching the ECM, which injects a less fuel than actually needed.. thus runs lean...
just an engineering guess....
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