My 4th Fiero, My first 2.8 V6. I have A LOT of questions (Page 1/6)
Curlrup MAR 28, 05:44 PM
OK I bought a 1986 SE with a 2.8. Hard start stumble, stumble, stumble. Sounds and feels like vac leaks galore. I have questions as in there are 1/2 inch hard metal pips that look like to be a brake booster line, but NOTHING attached to them. Also a few visibly bad connections or missing vac connections. See Photos. I am asking for help identifying missing connections, and bad connections, so I can learn about this motor. Anything Iron Duke I am the master but 2.8 nope. So please look at the photos and help me identify these.

Also the tail lights kinda work. They are Very Very Very Very dim. I can see the bulb filament slightly glow orange. One bulb socket was crimped on with blue crimp connectors. I'm wondering if one socket is bad or has a bad connection with it dim the entire system in the rear?

Thanks folks!

Curly


What is this entire module? It has like 5 bad vac connections on it.


Random not connected to anything electrical connector....What is it for?


What is this hardline for? Where does the vac line fit to the motor?


Same with this one? What for and where?



It's been a long time since I had a car with cruise. Are these vac line nipples or just bleed off openings? I forget.

IMSA GT MAR 28, 05:54 PM
Ignore the large tube that you are pointing to. That was a recall tube that goes nowhere.

That module is the EGR solenoid and needs to be connected. (You can see it in the diagram)

Here is the vacuum line diagram. Be aware that where it says "plenum", the lines are connected underneath the intake plenum.

[This message has been edited by IMSA GT (edited 03-28-2021).]

Patrick MAR 28, 06:15 PM

quote
Originally posted by IMSA GT:

Ignore the large tube that you are pointing to. That was a recall tube that goes nowhere.



That tube is supposed to be capped on the end, otherwise unfiltered air is being drawn into the filtered side of the air filter canister.

CLICK FOR FULL SIZE
Curlrup MAR 28, 06:24 PM
Awesome....Thank you. This explains a lot. Just picked up a bunch of vac line. I'm going to replace everything that is rotted. There is a larger line that comes off the EGR solenoid, and runs to the fire wall. That thing is crumbling to dust.

Ok and cap that large tube. SO both large metal tubs shown are recall lines?

IMSA GT MAR 28, 06:28 PM

quote
Originally posted by Patrick:

That tube is supposed to be capped on the end, otherwise unfiltered air is being drawn into the filtered side of the air filter canister.

CLICK FOR FULL SIZE



Is that right? I though both ends were abandoned?

I stole this image from Fierosound:

[This message has been edited by IMSA GT (edited 03-28-2021).]

Curlrup MAR 28, 07:32 PM
Yep. Those are it. Ok so plug em up. I Changed the lines from the EGR solenoid. Found some of the molded plastic lines broke. Coupled the breaks with some tubing. It almost looks like the hard lines against the trunk wall are rusted and have pin holes. When I pinch off the rubber tubing going to them the engine idle lowers. Plus they are really really rusty. I might need to find replacements for those.
Patrick MAR 28, 07:47 PM

quote
Originally posted by IMSA GT:

Is that right? I though both ends were abandoned?

CLICK FOR FULL SIZE



At the dealership during recall repairs, this particular task was dealt with a couple of different ways (from what I've discovered on my own and other people's Fieros). The left side end of that tube connects to the filtered side of the air filter canister. In most recalls, it appears that the tube was left attached to the canister, and the right side end of the tube was capped. Sometimes though, it appears that the tube was disconnected at the canister, and the canister itself was plugged/capped. In this situation, then sure, the right side end of the tube could remain open, as the tube was no longer connected to anything. However, never assume that this is the method that has been utilized when you see an uncapped tube, because if the tube is still connected to the air filter canister, then filthy unfiltered air is being drawn directly into the intake system.
Patrick MAR 28, 07:52 PM

quote
Originally posted by Curlrup:

CLICK FOR FULL SIZE


What for and where?



The following image was just posted in another thread. I suspect the tube above has been bent and is supposed to be plugged into your snorkel.


quote
Originally posted by skywurz:
Patrick MAR 28, 08:13 PM

quote
Originally posted by Curlrup:

It almost looks like the hard lines against the trunk wall are rusted and have pin holes. When I pinch off the rubber tubing going to them the engine idle lowers.



I suspect those metal tubes along the trunk wall are usually overlooked when vacuum leaks are being searched for. With these cars getting older, and often rustier, pinholes in engine bay metal tubes will no doubt become more commonplace.
Curlrup MAR 28, 09:11 PM
Any thoughts on the very very dim tail lights? Almost like there is some resistance somewhere.