I have no idea if this is supposed to be connected to something or what its for, Its been disconnected since Ive had the car from what I can remember

Where's the other end going to? Looks like it would be attached to the intake somewhere?

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* 1984 Black Fiero SE (1995-1998) blown tranny - rest her soul
* 1988 Black Fiero Formula (2001-2004) Was to be a 3800SC, badly rusted rear frame.
* 1988 White Fiero GT (2009 - Present) This one's a keeper!

Looks like the vacuum line from the brake system.
It should be connected to the rear side of the intake plenium.
Normally, if this is disconnected, your idle speed should be very high (over 2000 rpm).
Does your car brake normally?

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Bernard
Fiero V6 GT 1987 (Manual)

That looks like the PCV tube that was disconnected and bypassed as part of a GM recall. The replacement PCV tube goes to the intake hose just in front of the throttle body, instead of the air filter can.

edit to add: the vacuum line for the brake booster is the one below that goes down the center of the firewall.

[This message has been edited by Blacktree (edited 04-11-2010).]

Well idle when warm is 950 or so and there's one that's attached to the intake and the back of it is clamped to a metal tube on the firewall and brakes work just fine

The old PCV routing, like blacktree said, my 87 gt has the same pipe it goes to the air filter can. If you leave it unplugged you will pull unfiltered hot air into the engine. Plug it! I used a round piece of aluminum I had laying around to plug it.

[This message has been edited by daring4 (edited 04-11-2010).]

Hm ok, thanks as long as it doesnt need to go somewhere lol

If that tube goes into the valve cover, you can't just plug it; it's part of the PCV system.

EDIT: Wait, was that connected to anything at either end?

The PCV system is definitely something you want to keep operational.

You have to connect that tube to a source of filtered air, such as the stock air cleaner.

Alternatively, if you don't want to bother with running an air tube to the air cleaner, you can use a small dedicated crankcase breather air filter.

On my engine (I should get a more recent picture...), I put the PCV valve on the front valve cover, and the breather on the rear valve cover. The direction isn't important as long as you have some kind of positive ventilation going on.

[This message has been edited by pmbrunelle (edited 04-11-2010).]

Not wanting to argue but in the second picture of the OP the PCV tube is visible under the throttle cable. My car looks the same, but I have plugged that open line becuase it was the old PCV line that might spew engine oil on the paper filter, sometimes, causing the recall. If you leave it open air will be pulled in on the outside of the filter, bypassing it. Granted not much but makes sense to close it up.

Hey Pm, did you run the hose from the front valve cover to under the manifold where the stock one ran? If so that looks pretty sweet!

[This message has been edited by daring4 (edited 04-11-2010).]

Well then, nevermind... I don't see anything much other than darkness in those pictures. I think it's time to get rid of my 8-year-old CRT computer monitor!

Yea the first picture shows it next to the hose already plugged into the manifold or valve cover whichever thats goin into and the second one shows it running all the way down to some metal tube so im thinking that youre right and it is an old recall tube that the just left on there and never plugged up

quote Originally posted by White88Formula: Yea the first picture shows it next to the hose already plugged into the manifold or valve cover whichever thats goin into and the second one shows it running all the way down to some metal tube so im thinking that youre right and it is an old recall tube that the just left on there and never plugged up

Just to make sure, the large rubber hose from air cleaner to throttle body has a tube just before the t/b that goes to the front valve cover, right?

100% it is the old PCV tube and during the recall the hose was supposed to be removed and the metal line on the firewall capped.

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That line runs from the back valve cover to air cleaner. It is now redundant.

The recall installed a new tube from valve cover to rubber intake tube. Usually they remove the hose and install a rubber cap over the end of the metal tube. If it's open, you're getting unfiltered air being sucked through the tube bypassing the air filter.

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3.4L Supercharged 87 GT and Super Duty 4 Indy #163

yep, cap that sucker, if you follow it, it just goes to the air cleaner on the outer side, hence allowing dirt and anything else that falls in its way to be sucked strait into the intake bypassing the air filter.

K, thats what everyones sayin so for the 3rd time lol Thanks, Ill have to take off the rubber and block the metal with somethin tomorrow....ty ty

Just found this picture of the recall kit. You can see the new rubber intake tube and the valve-cover-to-intake metal tube that replaced it as well as the new exhaust and heat shield.

quote Originally posted by fierosound: Just found this picture of the recall kit...

I wonder what the "official" way to cap the unused breather tube was supposed to be?

When I bought my '86 GT a couple of years ago I found that the old breather tube was not capped and the engine had been sucking in unfiltered air through it for a couple of decades.

Yea I just took off the old hose and temporarily capped it by taking inch wide electrical tape X'ing it over the top of the whole then taking another piece and wrapping it around the X so it doesnt come off

I followed up with a new thread. Should be made a "sticky" https://www.fiero.nl/forum/F.../HTML/107973.html#p1