Check to see if these wires have 12 volts at the mass air flow sensor using a multimeter. This voltage will only be applied for approximately 5 to 30 seconds after the engine has been shut off ...

This was the case for [Rob] and his Porsche 944, which had relied on an old-fashioned mechanical air flow meter (AFM). He decided to replace this with a modern mass air flow (MAF) sensor instead ...

This sensor type is based on the principle that if a mass is maintained at a constant temperature (above ambient air temp), the thermal loss is proportional to the flow of air over that mass.

Modern fuel metering systems are designed to reduce fuel consumption and exhaust gas emissions in internal combustion engines to meet future emission legislation limits. The first step to achieve this ...