A new virtual fuel sensor reduces the cost and complexity of adding E85 capability to the fuel system. The ECM samples the exhaust at the oxygen sensor, and an algorithm determines whether E85 is used, as well as its mixture percentage with gasoline. It’s a much simpler, less costly system than previous systems that relied on fuel composition sensors. In fact, the entire system on the engine is simple: only the fuel rail and fuel injectors are different between E85 versions and non-E85 versions.
Did ya get that? The only difference between a flex fuel vehicle and a non flex fuel one is basically the fuel injectors. They probably flow a little more than the non-flex fuel ones.
I'm looking into the availability of higher flow injectors for the Saab.