[OT] Boom boom sound

[Wes Branchflower]

Look i'm young, don't have a degree in anything :) hell i carn't even drive 
car yet, but i was just thinking, does this popping usually happen in manual 
cars?
I thought it happened when the engine was been over-spun by the gears in a 
manual transmission? Sort of like when you use engine brakeing.

I've heard it happen in a lot of carburettor application, with the throttle 
plate closed, and still a stong vacuum from the wheels spinning the engine 
fast, it would suck in more petrol than it could burn and run rich? Combine 
that with a free, open exhaust, and you've got enough air to burn that 
richness?

In an EFi application, would the EFI computer get confused from the amount 
of air being 'sucked in' Vs. the throttle position (closed) during engine 
braking?

(more air is sucked in during engine brakeing with closed throttle, because 
the engine is spinning faster powered by the momentum of the car?)

It would see more air than it should getting into the engine, with a closed 
throttle plate, and in a MAP system, would this create a really stong 
vacuum, and it would mis-calculate the engine and somehow make it run rich?

Thanks for reading, sorry if I just wasted your time with stuff you already 
know.

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