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95 G30 5.7 TBI what is this round thing?! #752988
October 03rd 2019 8:57 pm
October 03rd 2019 8:57 pm
Joined: Sep 2019
Posts: 8
Portland, OR
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OrionRaphael Offline OP
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OrionRaphael  Offline OP
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Portland, OR
Sooo been trying to figure out what this black plastic orb is and what it used to connect to. Can't find reference to it in either the Chilton or Haynes manual.

5/32 vacuum hose comes off it, connects to a Y adapter with a single wire sensor of some kind, goes to another Y adapter that's plugged on the extra port, goes to a 5/32 -> 7/32 adapter.... and that hose has completely degraded.

I'm assume it connects to this small hose that one of the previous owners plugged with a bolt on the intake manifold just in front of the distributor.

Am I correct that this is where this hose used to connect? Does anyone know what system this is or why it might be plugged like this?
I'm guessing in some sort of environmental control system a previous owner decided was undesirable to have connected. Vehicle runs great, doesn't smoke or idle weird, has plenty of power, getting decent (10-13) mileage.

Attached Files 1003191708_HDR.jpg1003191707_HDR.jpg
Re: 95 G30 5.7 TBI what is this round thing?! [Re: OrionRaphael] #753006
October 04th 2019 11:53 am
October 04th 2019 11:53 am
Joined: Aug 2002
Posts: 14,271
Lake City Florida, United Stat...
lukester Offline
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lukester  Offline
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Lake City Florida, United Stat...

It is just a vacuum reserve tank. So that when the vacuum in the engine goes up and down, there is enough volume to run things during the low times.


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Re: 95 G30 5.7 TBI what is this round thing?! [Re: lukester] #753025
October 04th 2019 3:13 pm
October 04th 2019 3:13 pm
Joined: Sep 2019
Posts: 8
Portland, OR
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OrionRaphael Offline OP
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OrionRaphael  Offline OP
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Originally Posted by lukester

It is just a vacuum reserve tank. So that when the vacuum in the engine goes up and down, there is enough volume to run things during the low times.


Thank you! That makes sense that it would plug into the IM. Really wonder why someone would plug that up. I'll see how it runs with that hose replaced.


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