NEED HELP ON SOME HOSE CONNECTIONS... (Page 1/1)
eti engineer AUG 01, 12:32 PM
I had taken a lot of pictures before I removed my engine for rebuild, but I have some questions on hose connections.

I am sure that one connection is for the vacuum booster for the power brakes, but I don't know what the other two are for. So any help would be appreciated.

See pics below:

The opening shown on the valve cover is on the front valve cover. I have already installed the PCV valve in the rear cover and it is fine, but I cannot for the life of me remember what was connected to the opening in the front cover. The opening is smaller than where the PCV valve fits in the rear cover, so I am sure it was probably a pipe, but I don't know.



The next picture is the front intake plenum connection. Does this go to the vacuum booster for the brakes?



The last picture is at the transmission side of the engine. I have no idea what was connected here.



I thought I had all my bases covered when I took pictures but I guess I was wrong. I am going to see what the Fiero Store offers for a tech manual for my car. I thought I had ordered one a long time ago, but I guess it was an intention I never filled. Any recommendations on a manual would be appreciate. As usual, thanks in advance for your help. Have a great day!!!
Notorio AUG 01, 12:49 PM
On you first picture, you are missing the pipe that goes from the front valve cover grommet to the base of the throttle body. It is held in place by a bolt going to the cylinder head right below it.
fierofool AUG 01, 12:52 PM
First picture is for the crankcase rebreather tube that fits into the air intake tube just ahead of the throttle body. Grommets for both the valve covers can be had from The Fiero Store. I'm not sure that valve cover is oriented properly. You can trial fit before you install the engine. The metal tube should snap into the grommet and into the intake tube. The tube has a bracket with a split end on it that should bolt to the engine/transmission. (Edit: Reference Notorio's picture.) I usually don't bolt it down because it creates problems when trying to remove the air intake tube.

Second picture is the vacuum for the brake booster. It transitions to a metal tube that exits from underneath the upper intake between the 2 and 4 intake runners. It then connects again to a rubber hose coming up from the firewall area.

Third picture is vacuum to the back side of the throttle body. A rubber hose fits over that nipple, transitions to an L-shaped metal tube that fits into the lower backside of the throttle body. Be sure the O-ring is in place in the throttle body port.

[This message has been edited by fierofool (edited 08-01-2021).]

eti engineer AUG 01, 01:12 PM

quote
Originally posted by Notorio:

On you first picture, you are missing the pipe that goes from the front valve cover grommet to the base of the throttle body. It is held in place by a bolt going to the cylinder head right below it.




I do have this pipe and I was thinking that maybe it had something to do with it. Thanks for the information!!! I can install it now. Have a great day!!!
eti engineer AUG 01, 01:17 PM

quote
Originally posted by fierofool:

First picture is for the crankcase rebreather tube that fits into the air intake tube just ahead of the throttle body. Grommets for both the valve covers can be had from The Fiero Store. I'm not sure that valve cover is oriented properly. You can trial fit before you install the engine. The metal tube should snap into the grommet and into the intake tube. The tube has a bracket with a split end on it that should bolt to the engine/transmission. (Edit: Reference Notorio's picture.) I usually don't bolt it down because it creates problems when trying to remove the air intake tube.

Second picture is the vacuum for the brake booster. It transitions to a metal tube that exits from underneath the upper intake between the 2 and 4 intake runners. It then connects again to a rubber hose coming up from the firewall area.

Third picture is vacuum to the back side of the throttle body. A rubber hose fits over that nipple, transitions to an L-shaped metal tube that fits into the lower backside of the throttle body. Be sure the O-ring is in place in the throttle body port.



Thanks for the information. Now that I have a clue, I will be able to figure it out. I appreciate the help!!! Have a great day!!!