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Topic
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The Nissan service manual says the mass airflow reading at 2500RPM on a no load warmed up engine should be approximately 12.2 grams per second.
My scantool shows me at 2500RPM it’s about 10.3-11 grams per second.
Does anyone know if this sounds like a big enough difference to represent a problem? How does a mass airflow sensor account for cold air? Does it use the IAT in any way and would a defective IAT bias the mass airflow sensor? What about the air filter in front of the sensor? Can’t that bias the reading?
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The computer uses the IAT for the air temperature. On some types of MAFs the IAT is integrated with the maf.
A MAF that is not functioning per specifications can cause poor performance and increased fuel usage. It looks as though yours is not functioning to spec.
The air filter can have a restrictive effect, so it could cause an issue. Also oil impregnated air filters are said to have caused issues with MAFs, but I have not personally observed this.
Karl
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