Quote:
Originally Posted by Bearleener
My 1996 VW Golf has a similar system built into the airbox, which when cold pulls the air in from a baffle over the exhaust manifold (through tube 2 in picture below). When the intake air is warm enough (switch takes place between 35 and 45 degrees C) the little door moves to open up the cold air tube (4). It's activated by a thermostatically controlled vacuum switch (3) at the throttle body header operating a vacuum actuator (1), which moves the little door. Maybe you could use that for switching.
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I couldn't help but notice: why do vehicles have these devices??? Is there something to intake air temps after all?
I had a '99 Acura TL that had an odd device. It ran coolant to small radiator-like device in the airbox. A door opened under certain conditions to warm the incoming air. I forced it open, but the 02 sensor was going bad so I can't couldn't conclude much. It knocked a lot...that's about it...
Anyhoo, is it emissions on startup? Fuel Economy?
RH77