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Manifold Question by FORMULA_2D_1988
| Started on | : 09-26-2022 12:45 PM |
| Replies | : 11 (339 views) |
| Last post by | : Notorio on 10-08-2022 02:37 PM |
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Sep 26th, 2022
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FORMULA_2D_1988
Junior Member Posts: 1
From: Indiana
Registered: Sep 2022
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Hi everyone, I am new to this forum. I bought a 1988 Fiero Formula V6 and I noticed after I bought it that something is capped off on the manifold, I am wondering what this is, where it should be connected to, and if it is important. Thank you  [This message has been edited by FORMULA_2D_1988 (edited 09-26-2022).]
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12:45 PM
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PFF
System Bot
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Raydar
Member Posts: 41101
From: Carrollton GA. Out in the... country.
Registered: Oct 1999
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Welcome to our obsession! That's the vacuum supply for the EGR, IIRC. The EGR valve should be on the exhaust crossover, close to the coil and distributor, and have a metal flex tube going to the upper intake manifold, downstream from the throttle body. Looks like yours has been deleted. [This message has been edited by Raydar (edited 09-26-2022).]
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03:56 PM
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Patrick
Member Posts: 38324
From: Vancouver, British Columbia, Canada
Registered: Apr 99
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| | | quote | Originally posted by Raydar:
That's the vacuum supply for the EGR, IIRC.
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Raydar, wouldn't the line to the EGR valve be coming from the EGR solenoid?  And I believe the EGR solenoid gets its vacuum from the throttle body? Having said all that, and without looking at my Formula (or googling), I don't know for sure what's supposed to be connected to that port pictured above. Maybe one of the lines that goes to the fuel vapor canister? To the OP.... Take a look at the vacuum hose routing diagram under your rear decklid. [This message has been edited by Patrick (edited 09-26-2022).]
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04:19 PM
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Gall757
Member Posts: 10938
From: Holland, MI
Registered: Jun 2010
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That is the light green line in this diagram. I think it is used for the cruise control.  [This message has been edited by Gall757 (edited 09-26-2022).]
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06:22 PM
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Patrick
Member Posts: 38324
From: Vancouver, British Columbia, Canada
Registered: Apr 99
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| | | quote | Originally posted by Gall757:
That is the light green line in this diagram. I think it is used for the cruise control.
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No cruise control on my Formula, yet I have a vacuum hose on that fitting. I still suspect it's for the fuel vapor canister.  [EDIT] I found a diagram which indicates that the vacuum port in question does connect to the vapor canister.  [This message has been edited by Patrick (edited 09-26-2022).]
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06:42 PM
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Sep 29th, 2022
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Notorio
Member Posts: 3012
From: Temecula, CA
Registered: Oct 2003
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Here's what it looks like on my 88. Per Patrick's diagram, this is one of the plastic tubes that runs under the Upper Intake. It is taking an incredibly circuitous route to get to the Vapor Cannister, which is just a few inches away toward the driver's side. 
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12:12 AM
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Patrick
Member Posts: 38324
From: Vancouver, British Columbia, Canada
Registered: Apr 99
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| | | quote | Originally posted by Notorio:
It is taking an incredibly circuitous route to get to the Vapor Cannister...
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It does indeed! I just finished replacing the alternator on my Formula, and I could see that yes, that is the manifold port which provides vacuum for the fuel vapor canister. [This message has been edited by Patrick (edited 09-29-2022).]
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12:51 AM
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Notorio
Member Posts: 3012
From: Temecula, CA
Registered: Oct 2003
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Since you are new, these light plastic vacuum tubes that run in between the Upper and Middle intakes have cracked or otherwise been found leaking for a number of Fiero owners. Rodney Dickman sells a replacement set of metal tubes.
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11:10 AM
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Patrick
Member Posts: 38324
From: Vancouver, British Columbia, Canada
Registered: Apr 99
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| | | quote | Originally posted by Notorio:
...these light plastic vacuum tubes that run in between the Upper and Middle intakes have cracked or otherwise been found leaking for a number of Fiero owners.
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The rubber elbows and connectors also deteriorate. While I was replacing my alternator, my arm brushed against the side of my EGR solenoid a couple of times. Sure enough, it was enough to flex and break the short rubber connector located inside the circle below. (That particular rubber connector had turned into a sticky crumbly goo.) Fortunately, I had a length of rubber hose the right diameter that I could use a short piece of for a replacement.  [This message has been edited by Patrick (edited 09-29-2022).]
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05:39 PM
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Oct 6th, 2022
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Notorio
Member Posts: 3012
From: Temecula, CA
Registered: Oct 2003
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Patrick, have you found a source for those elbows and other rubber connectors? And just tossing out a rhetorical question here: is this going to be another thread started by a new member who disappears into thin air?? This seems to happen a lot. 
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12:22 AM
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Patrick
Member Posts: 38324
From: Vancouver, British Columbia, Canada
Registered: Apr 99
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| | | quote | Originally posted by Notorio:
Patrick, have you found a source for those elbows and other rubber connectors?
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I've actually never had to replace a rubber elbow or connector before... which was why I was pretty happy that I just happened to have a suitably sized hose in my bag of tricks that I could use a short piece of to replace the connector mentioned above. | | | quote | Originally posted by Notorio:
...is this going to be another thread started by a new member who disappears into thin air??
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01:03 AM
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PFF
System Bot
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Oct 8th, 2022
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Notorio
Member Posts: 3012
From: Temecula, CA
Registered: Oct 2003
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