L28e intake manifold vacuum lines and EGR removal.

[kuyz]

Hi everyone,

 

I am hoping someone can help me out, I recently had to replace my exhaust/intake manifold and while I was at it I decided to remove the EGR valve and the auxiliary air (choke) and all the vacuum lines attached.

 

Anyway after getting it all back together I found my revs were sticking when I revved the engine (ie air leak in the intake manifold).

I found the problem to be a a vacuum hose which I'm not sure what it does, I hope someone can help me identify what it connects to in the photos! (the dashed red line in picture 1A, and the things it connected to).

 

I capped the ends and at it stopped the revs sticking, but once the car has fully warmed up it still idles high at about 1100rpm and it appears that the idle screw pipe is letting in too much air; when I clamp it with pliers the revs drop down.

 

Any help identifying the parts would be much appreciated.

 

In the pics attached I want to know what the blue things in both pics are.

And in the pic 1A what the green circled thing is, and if I need the vacuum line to it which is from before the throttle body.

 

And in the second picture 2A, I would like to identify the thing circled in blue, which sits on top of the thermostat housing, has two vacuum lines to it, and two wires to a plug.

One of the wires has broken away and I am wondering if this thing is essential/what it does?

 

I have the EFI bible and I couldn't find either of these two things in it! If anyone has any idea please help me.

I want to remove both but would like to know what they both are before I do!

 

Thanks

-Kuy

[dat2kman]

Because of the ease of connecting some items incoorectly, and with these manifolds it is easy to do,

I would strongly suggest you get a workshop manual, either in book form, or, better yet the pdf format as a download.

No need to get the whole 600 pages of the manual, but just the section on the injection.

I have it, but on paper form off the net.

Dont have the ability to scan and upload to here!

[kuyz]

Yeah I have the pdf FSM also. I found out that its the BCDD (Boost Controlled Deceleration Device - somehow managed to miss it all the other times I looked)...

Not sure if the BCDD is the issue, but I'm going to block it off now and find out!