M42club.com - Home of the BMW E30/E36 318i/iS

DISCUSSION => General Topics => Topic started by: longms on December 12, 2008, 07:10:55 PM

Title: E30 M42 ICV/plumbing questions
Post by: longms on December 12, 2008, 07:10:55 PM

I am sure this has been covered before but I need to know where a couple of things mount and connect.

I need to know where the hose on top of the ICV connects and what all the mounting hardware mounts to (in the picture below)? Thanks for the help. This plumbing is the only thing holding back my car from starting right now.

If anyone has there intake assembly off for any reason and would be so gracious to take a picture of how the plumbing/piping is situated that would be awesome. I can't seem to figure out how it all goes under the intake.

(http://i372.photobucket.com/albums/oo163/mslong27/M42-4.jpg)

Title: E30 M42 ICV/plumbing questions
Post by: JP 91iS on December 12, 2008, 07:18:03 PM

(http://www.m42club.com/forums/picture.php?albumid=26&pictureid=148)

Upper hose attaches to intake manifold, mounting bracket attaches to the bolt that mounts upper to lower manifold.

Title: E30 M42 ICV/plumbing questions
Post by: twright on December 13, 2008, 07:19:30 AM

Please be sure to mount the IGV with the arrow pointing "Down".  It will run a lot better if you do this.  (Don't ask me how I know.)

Title: E30 M42 ICV/plumbing questions
Post by: longms on December 13, 2008, 09:13:26 AM

Quote from: twright;62738

Please be sure to mount the IGV with the arrow pointing "Down".  It will run a lot better if you do this.  (Don't ask me how I know.)

Seriously?????

Title: E30 M42 ICV/plumbing questions
Post by: roundel318 on December 13, 2008, 09:53:18 AM

Correct, the end with the smooth hose feeder part goes up (they suggest a hose clamp even) to the valve cover and the end with the ribbed feeder part goes down to the Medusa, or "the mess under the intake" :)

Title: E30 M42 ICV/plumbing questions
Post by: twright on December 13, 2008, 05:49:57 PM

My IGV was connected the wrong way.  I was having problems with rough running after a warm start.  It is getting better after I reversed the direction of the IGV.  I still have a problem, but this helped.  (I don't understand why it would make a difference, but it does.)

Title: E30 M42 ICV/plumbing questions
Post by: longms on December 13, 2008, 10:24:08 PM

Good looking out to you guys. About to fire up a 2 year project and trying to tie up the loose ends. Working at a snails pace sucks and it also doesnt help that I live in a different city than the car is in.

Title: E30 M42 ICV/plumbing questions
Post by: Cobra Jet on December 15, 2008, 11:30:36 AM

mount the ICV w/ the arrow down???

exactly what arrow is being referred to?

Title: E30 M42 ICV/plumbing questions
Post by: longms on December 15, 2008, 02:40:39 PM

There is physically an arrow stamped on the housing of the ICV. They are saying to mount the ICV with the arrow pointing down.

Title: E30 M42 ICV/plumbing questions
Post by: BraveUlysses on February 16, 2009, 11:57:42 AM

Bump

Is this actually correct? My understanding is that the ICV arrow should be pointing with the flow going from the intake TO the manifold.

http://www.m42club.com/forums/showpost.php?p=49362&postcount=30

Title: E30 M42 ICV/plumbing questions
Post by: JoeDellio on February 17, 2009, 12:00:41 AM

It says right in the manual that the arrow needs to point up.

Title: E30 M42 ICV/plumbing questions
Post by: strad on February 17, 2009, 12:21:27 PM

Arrow points in direction of airflow.  That's towards the manifold side of the valve.  I've no idea if that is "down" or "up" since I can't see it on my M42 (even though I've r/rd it correctly lol).  But my M20's is in plain view, and that's how it is oriented.