Air filter box info and mod
05-27-2007, 06:40 PM
#24
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Not quite: I removed the butterfly to improve flow & trick the ECU into thinking things are OK
The selenoid (and butterfly) is normally closed, so if you remove the vacuum line, the valve stays closed.
05-28-2007, 07:01 AM
#29
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as i've come to find out
vacuum operated, when vacuum pressure is high enough(high engine speeds) the solenoid and valve open.
makes me wonder how the ECU supposedly figures in.
remember the air cleaners on top of carbureted engines which had a butterfly valve which was vacuum operated monitoring air flow, especially during cold engine operation? they wouldn't open fully until engine was warm, thus providing a richer mixture for warmup. this is obviously a different animal and different purpose.
makes me wonder how the ECU supposedly figures in.
remember the air cleaners on top of carbureted engines which had a butterfly valve which was vacuum operated monitoring air flow, especially during cold engine operation? they wouldn't open fully until engine was warm, thus providing a richer mixture for warmup. this is obviously a different animal and different purpose.
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