2G Unknown hose (maybe vacuum hose)

[Ezylpro]

Hey! I have this unplugged hose on my engine, that I think should be plugged in.

The issue is that if I plug it in, the RPM instantly drops, almost if it was "killing" it. I know the point in the engine "sucks" air, so that's why I thought it could be a vacuum line or something. If I put my finger in the point in the engine, the same thing happens, seems like the engine is "dying", so maybe the other end of the hose is not connected, or blocked?

Not sure what this hose does, and where its connected to. I tried following it but it goes under the engine and I couldn't really take a look at it.

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[Mello]

It's for your fuel pressure regulator. OEM has a solenoid in between on the driver side firewall to help with startup. Hose connects to the manifold nipple next to your shown in your picture. When working car should idle normal around 750rpms. If the idle is not 750 you have some troubleshooting to do. You can bypass the solenoid & connect the hose directly from the regulator to the manfold for testing also.

 

[19Eclipse90]

And the vacuum diagram, for reference.

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[Ezylpro]

Got it! Thank you guys so much for your replies!

Not entirely sure how to bypass the solenoid & connect the hose directly from the regulator to the manifold, but I will search how to. Now, the one I circled blue, doesn't have anything connected to it (but it seems to have threads inside it). Should it have something connected? I also don't know what that is

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[steve]

Not entirely sure how to bypass the solenoid & connect the hose directly from the regulator to the manifold

To bypass the fuel pressure solenoid you run a vacuum line from the manifold nipple to the nipple on the Fuel Pressure Regulator like the yellow line shows.

Once you seal up all the vacuum leaks you'll have to readjust the BISS on the throttle to set the idle speed and also make sure your ISC is functioning.

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