Originally Posted by
Civic2Scooby
hmm why did I think it was the other way around.
If you vent to atmosphere then the MAF would read less air and subsequently reduce fuel injected. It wouldn't still inject a a certain fuel amount when reading a low MAF reading.
MAF reads high air, adds fuel, BOV lets off the read air before it reaches the engine.
it's a lot like a rollercoaster, the BOV causes a huge drop in pressure that wasn't along the path that the computer and MAF figured it would be on.