Mass Air Flow Meter - working at 100% ?

[leithcm 0]

Hi Guys, Have been told that while a scan will tell you the MAF is working, it will not tell you if it is working 100% of what it is supposed to be doing, or perhaps if it is working only at 10%. Is this right? If so, how does one tell how well the MAF is doing it's job? I asked my informant how, and his reply was "Compare it to a new one."

Thanks very much.

[*Glenn* 854]

That is correct...however there are some guidlines depending on engine capacity

Idle range 12-18 Kg of air

Full WO throttle under load 450-600 Kg

Edited February 14, 2011 by *Glenn*

[leithcm 0]

That is correct...however there are some guidlines depending on engine capacity

Idle range 12-18 Kg of air

Full WO throttle under load 450-600 Kg

Thank you, Glenn. Specifically, for my car - E36 323i M52B25 mfd 01-1996 - would that tighten the boundaries you have given?

[*Glenn* 854]

10-15 idle and a minimum of 500 at WO throttle under load

There is no real way of guaging in between, you could compare new & used on a dyno if it was done the same day under exactly the same condition. For road use it's probably not that critical

[polley 916]

Glenn, is that figure KG of air per minute or hour or what?

Just interested.

[leithcm 0]

10-15 idle and a minimum of 500 at WO throttle under load

There is no real way of guaging in between, you could compare new & used on a dyno if it was done the same day under exactly the same condition. For road use it's probably not that critical

Thanks Glenn, appreciate your help.