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99 Miata vacuum lines

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Old 11-17-2016, 08:49 PM
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Default 99 Miata vacuum lines

Can anyone help me identify what these lines connect too? Second photo is a close up of the line on the left in pic 1.


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Old 11-18-2016, 08:07 AM
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There should be a vacuum hose routing sticker under the hood.
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Old 11-18-2016, 09:29 AM
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one of the two parallel hoses goes here
the one going to the sensor at a 90° angle goes here
They are both going to the intake manifold though so it probably doesn't matter which one goes where
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Old 11-18-2016, 12:11 PM
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Originally Posted by rigidbigelsworth
one of the two parallel hoses goes here
the one going to the sensor at a 90° angle goes here
They are both going to the intake manifold though so it probably doesn't matter which one goes where
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Old 11-18-2016, 01:33 PM
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Originally Posted by rigidbigelsworth
They are both going to the intake manifold though so it probably doesn't matter which one goes where
Be careful with this -- there are a couple ports on the VICS manifold that are special. There's a vacuum reservoir for the VICS solenoid that's built-in to the manifold, it's basically just a second cavity that's not attached to the plenum with 2 vacuum ports on it. One of them is fed by the line that runs under the fuel injectors (with the one-way valve in it), the other connects directly to the VICS solenoid. If you hook it up wrong then the VICS butterflies won't operate properly at WOT because there won't be any vacuum in there.

I don't remember which port the solenoid is supposed to use.

--Ian
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Old 11-18-2016, 02:21 PM
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Good point Codrus, I hadn't thought about the impact of the VICS

just ignore my comment about it not mattering where each one goes. Copy my comments under each pic about which one is which and you should be fine.
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