How to Test if MAF is working correctly

[socratic]

How does a car with a bad MAF run? Idles poorly? Less power?

Does it come on gradually or will it suddenly go bad one day?

[MNBoxster]

Originally Posted by socratic

How does a car with a bad MAF run? Idles poorly? Less power?

Does it come on gradually or will it suddenly go bad one day?

Hi,

It runs poorly. The ECU (DME in Porsche Parlance) cannot get an accurate signal indicating the Mass of air entering the Intake, therefore, it cannot select the appropriate Fuel/Timing MAP to maintain a stoichiometric mixture (14.7:1 for 92 Octane Gasoline). Then the O2 sensors give it even more confusing or non-corroborating information. Eventually, the DME will select a default MAP often referred to as Limp mode. Starting, Performance, Idle, and Range (MPG) can suffer. It can degrade progressively, or suddenly. Hope this helps...

Happy Motoring!... Jim'99

[JFERR]

I'm thinking about installing an EVO cold air intake in my 02 Boxster S. Is there anything I need to be concerned with regarding the MAF?

Thanks,

[CJ_Boxster]

Originally Posted by JFERR

I'm thinking about installing an EVO cold air intake in my 02 Boxster S. Is there anything I need to be concerned with regarding the MAF?

Thanks,

I remember hearing from 2 members that after they installed the evo cold air intake, they received MAF codes and only went away after going back to stock intake... also, they were not satisfied with the power gains of the new evo intake.