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what the heck is the Ported Vacuum Switch 4?

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Old 01-19-2010, 09:53 PM
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Car: 87 Trans Am
Engine: 350
Transmission: 700r
Axle/Gears: ones that turn
what the heck is the Ported Vacuum Switch 4?
I have a Ported Vacuum Switch coming out my thermostat houseing next to the temp sender. what is that Ported Vacuum Switch for?
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Old 01-19-2010, 09:54 PM
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Car: '87 IROC
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Re: what the heck is the Ported Vacuum Switch 4?
Probably for the EGR.
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Old 01-19-2010, 09:57 PM
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Engine: 350
Transmission: 700r
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Re: what the heck is the Ported Vacuum Switch 4?
I dont have egr anymore so away it goes lol. getting a new housing with no holes in it and going off the intake for water temp sender.
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