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Old 06-14-2012, 08:40 AM
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another tranny question

What does the vaccum modulator valve do? just curious
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Old 06-14-2012, 09:48 AM
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There is a vacuum modulator and a vacuum control valve, but not a vacuum modulator valve.
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Old 06-14-2012, 01:47 PM
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The vacuum control valve on the IP simulates manifold vacuum as if the engine had an air throttle. It functions as an engine load sensor, more load = less vacuum, but it's more accurately a throttle position sensor. The modulator translates this vacuum signal into plunger motion so shift quality is maintained regardless of engine load.

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