On a 2.8L theres a nipple on the lower intake mainfold, by the distributor, right underneath the egr tube on the upper intake manifold. What conects to this. there is alot of air being sucked into there but i dont know where the hell it goes. I have a picture if anybody needs to see it, just give me your email and i will send it.

Thanks, Adam

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-1985 Pontiac Fiero SE w/ 3.4L

If it's the big one pointing up out of the manifold it's the tube that supplies the idle air and air for the cold start injector for starting.
Should have a short rubber tube about three" long that connects to the bottom of the Upper intake.

[This message has been edited by Dodgerunner (edited 07-16-2006).]

It is a vacuum line,which goes, I THINK(!!!) to the PCV, or the canister..but I am only guessing..somebody will tell you for sure.
Nick

if it's the one I'm thinking there's a corrresponding nipple hanging down from the plenum, and there's a length of hose that goes between the 2....


Rich

does anyone have a vacuum diagram, and not the one thats under the hood?

https://www.fiero.nl/forum/Forum2/HTML/073836.html

The above does not show the one I think you are looking for.

[This message has been edited by Dodgerunner (edited 07-16-2006).]

Where does that black rubber hose go that is by the egr tube. (second yellow line from the bottom on the left) That hose connects to the nipple im talking about. where does it go from the nipple

Nice picture Dodgerunner!! Took the liberty of marking in yellow the one I think he means..this is the one which goes to the PCV..I think

Nick

is there suppose to be a larger fitting on the back of the throttle body on the back on the bottom?

Don't understand the question!! Sorry..

the hose that goes to the IAC. theres a huge hole on the back of my Throttle body, on the bottom, in the middle. i can stick my pinky finger onto the hole.

Aslo. i have this "L" shaped metal tube. dont know hwere this goes. (sorry, its been year since this thing was put together right)

If you mean this tap, it's the one that goes to the black pipe that goes to the
TB. It's for the idle air and cold start.


Or do you mean the hold in the back of the tube from the air cleaner to the TB that has a large hole in the back of it. That hole goes to the pipe that goes to the back valve cover. It is the clean air supply for the EGR system.

[This message has been edited by Dodgerunner (edited 07-16-2006).]

yes, thats one! does the pipe just slide right in there?

There is a short rubber hose that couples them together.

Hey just saw your from NE. Great! I'd like to have a get together some time and meet some of the NE owners.

[This message has been edited by Dodgerunner (edited 07-15-2006).]

well i got the hose put where it belongs. I started it and it started good but ran at 500rpms and it would stubble and shake, then die. i had it purring like a kitten once but it did a few secs later and has a hard time starting now. Ive decided to let it sleep for the night and let the battery charge.

Dodgerunner, yup from the good ol' NE. if i could ever get this damn thing running right we could have a get together but until then, im sitting on the side lines

I get the idea that the IAC is jammed..you have gone from having too much air, to not enough. Take out the IAC valve, carefully clean it, connect it back to the harness, and when the engine is cold, just turn on the ignition. You should see the pintle try to move, or even shoot out, as the ECM tries to reset the valve for a cold start.If the pintle doesn't move, it may be a bad connector, or the IAC is shot.Give it a try!!
Nick

im planning on replacing the IAC anyways, its like the last sensor thats not new. Although i think my problem is most likly in my new thread.

Sorry to interupt, but how exactly do you remove the IAC. I tried to put an adjustable wrench on it, but it seemed like I was going nowhere. There must be a better way?

Disconnect the cable (obviously!!).and fit a 32 mm socket over it..it should clear enough to be able to undo it. Be careful not to lose the washer than is between the IAC body and the TB
Nick

i had the hardest time getting mine off too when i had it off. i put the TB in a vise and used my big boy wrench to get it off. it took alot but you can do it, if not, try PB blaster. that stuff saves lives

Thanks, I was hoping to do it with the TB in the car. 32 mm, eh? That's one I'll have to go buy!

quote Originally posted by Fierospeed: well i got the hose put where it belongs. I started it and it started good but ran at 500rpms and it would stubble and shake, then die. i had it purring like a kitten once but it did a few secs later and has a hard time starting now. Ive decided to let it sleep for the night and let the battery charge. ...

I just stumbled across this thread, while looking for somethign else. Probably too late, but WTH...

When the hose was off, it created a huge vacuum leak. I'm guessing that your engine was idling at 2000 RPM or better.
Meanwhile, the ECM was trying to slow it down. It probably has the IAC completely closed.
Once you put the pipe back in place, it is not getting enough idle air, because of that.
Take the car out and drive it. (It'll keep stalling. Be careful.) Once the engine is up to temp, and you go over ~35-40 MPH, the IAC should reset.
I had the same problem with my Formula, when the EGR tube cracked.

[This message has been edited by Raydar (edited 10-22-2006).]