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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?
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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