I am putting a V6 from an 86 4 sp into my 87 5 sp (formerly a 4). I forgot to take good notes when the 6 was removed from the donor car at someone else's house. On the forward side of the engine bay, there is a pair of tubes (one small 3/16" or so and one large 1/2" or so; I did not measure). These tubes are welded together and bolt onto the firewall horizontally with a welded tab on each end of the pair, and additionally one clamp on the right side of the car on the small tube, which extends another foot or so to the right of the large tube. On the left side, the small tube looks like it hooks up to the plastic elbow below the V6 air cleaner assembly and the other tube possibly to the steel air filter housing. The right end of the large tube ends behind the throttle body (as you look at it; car forward side of the engine bay). The small tube extends another foot or so to the right of the car.

There is a 1/2" or so tube pressed into the lower intake manifold below the throttle body aligned vertically which has a short 2" or or so rubber tube slipped over it. This slides into a steel tube elbow, which I think was pointing to the left side of the car.

Help...what are they and where do they connect?
Thanks
Jim

On the donor car is a vacuum layout for that car and that car only. Take a die grinder an remove it and fasten it to your car.

Are these the hoses you're talking about?

https://www.fiero.nl/forum/A...031110-2-039405.html

The tubes shown are the ones. Interesting read...also, I still would like to know what the other tube is...the one coming from the lower intake manifold.

Thanks
Jim

This one?

No, not this one. The tube I am referring to is one that is a press fit steel tube vertically into the lower intake manifold (of three pieces). It is short, maybe 3/4" long. A 2" rubber hose is slipped onto it. A 90 degree elbow steel tube is slipped into the rubber tube. When I dissassembled the engine, the open end of the elbow was pointing in the same direction as the throttle body opening. The outboard end is parrallel to the throttle body opening, and located directly below it. In the picture you showed, you can not see the tube.
Thanks
Jim

That is your idle air inlet. That short tube connects to the backside of the throttle body and is how idle air gets into the intake.

I just went back out to look at the engine, which is still out of the car. The press fit tube is located just in front of the 7th injector. I stand corrected on the shape of the elbow. It has two 90 degree bends in it.
Jim