I am trying to find where a vacuum tube connects. It is one of the small plastic ones that comes out from under the plenum at the front of the engine. About 3 inches of the end I see curves in a half circle. I checked the diagram on the deck lid, and see no tube like it. All other tubes are in place. Any ideas?

quote Originally posted by john carter: I am trying to find where a vacuum tube connects. It is one of the small plastic ones that comes out from under the plenum at the front of the engine. About 3 inches of the end I see curves in a half circle. I checked the diagram on the deck lid, and see no tube like it. All other tubes are in place. Any ideas?

Can you take a picture with your phone and post it here?


Thanks!

Dude,

year/engine would help. As far as the diagram it's not going to show sizes. As T/A stated a picture would help.

Let us know,

Thanks

john carter - 87 GT

Here is a photo of the V6 Vaccum Plastic Lines


V6 Vacuum Line Diagram

------------------
Original Owner of a Silver '88 GT
Under 'Production Refurbishment' @ 136k Miles

[This message has been edited by Vintage-Nut (edited 02-17-2024).]

quote Originally posted by Vintage-Nut: john carter - 87 GT Here is a photo of the V6 Vaccum Plastic Lines V6 Vacuum Line Diagram

I'm stealing both of these pictures!!!

I think PFF is about sharing information......

[img]htt[img] <A Class="HTMLBodyLink" HREF="https://images.fiero.nl/userimages/john%2520carter/DSCN6263%5B1%5D.JPG[/img]ps://images.fiero.nl/userimages/john%2520carter/DSCN6262%5B1%5D.JPG[/img][img]https://images. fiero." TARGET=_
blank>https://images.fiero.nl/use...ttps://images.fiero.</A> nl/userimages/john%2520carter/DSCN6264%5B1%5D.JPG[/img]

[This message has been edited by john carter (edited 02-17-2024).]

That looks like it might go to the pcv valve, I'm assuming the engine runs fine? Mine is a Duke so a little different setup but same in principle. If you got a mirror I think you might be able to get a glimpse of what it was connected to.

I think 'this' is the smaller throttle body vacuum line which has been 'cut'....

IF it is true; connect it at the bottom of the EGR Solenoid

[This message has been edited by Vintage-Nut (edited 02-17-2024).]

Hey John,
I hope you know now that this 'vacuum tube mystery' is one of the original plastic vacuum lines that has been cut/shorten and 'repaired' using rubber vacuum hose. The key is which vacuum line?

I'm guessing it's the smaller throttle body vacuum line and the rubber vacuum hose in your hand shown is going to the bottom port of the EGR Solenoid.

BTW - The original plastic vacuum lines under the plenum are flexible when disassembling or assembling parts; however, they can get brittle and break from age and/or heat.

Both Rodney Dickman and The Fiero Store offers V6 Vacuum Line Replacements:

Rodney's V6 Stainless Steel Vacuum Lines
https://rodneydickman.com/p...o.php?products_id=86

TFS Black Powder Coat Finish V6 Vacuum Line Set
https://www.fierostore.com/.../Detail.aspx?s=52389

However, these rigid steel lines have no "give" and are much harder to disassembly parts or aligning them when installing, especially the bigger tubes.

I made a 'Hybrid':
I cut the original plastic 'ends' with their rubber boots; then
Reduce/cut Rodney's V6 Stainless Steel Vacuum Lines, and
Connected and sealed the plastic and steel tubes with rubber vacuum hose which I.D. was slightly smaller than the plastic/steel O.D.
This Hybrid has enough flexibility so I can replace my PVC valve easily....

So, you can 'repair' your original plastic vacuum lines with rubber vacuum hose (spaghetti method) using the diagram;
or replace them with these vacuum line sets.....

You're 'good to go'?

[This message has been edited by Vintage-Nut (edited 02-18-2024).]