Quote:
Originally Posted by IMADreamer
Well there is a little more to it rather then just having a map sensor but the basics of it are that if your computer bases it's fuel, VE, and other tables off a MAP sensor then you don't need to recirculate and account for the air so the blow off valve just vents to the atmosphere. With a MAS sensor, which is what almost every modern car has, the air that goes into the engine has to be accounted for at all times. So on these cars you use a by pass valve that allows the air that has passed through the sensor but not used in the engine to be recirculated so the computer can accurately monitor what's going on in the system.
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Thanks for clearing that up. I had to think about it for a minute but it makes sense.