Author Topic: The mess under the intake (Read 331091 times)

Choking Hazard · « **Reply #225 on:** February 26, 2010, 09:03:18 AM »

We should all be doing this on one big workshop. It looks like at least 3 or 4 folks are currently addressiung the "mess". I am at the same decision point. I thought:
1. The smaller, angled nipple off the side of the TB connested to the vac diaphram (what does it do?) on the fuel rail.
2. The large hose from the front of the valve cover connects to the black rubber bellows on between the TB and MAF.
3. The large hose from ICV connects to the underside of the TB.

Does that sound right to people who have already done this?

E30_3I8I · « **Reply #226 on:** February 26, 2010, 09:19:58 AM »

can we get more pictures on this? it sounds like i have the same thing as choking hazard

Chalino · « **Reply #227 on:** February 26, 2010, 11:18:56 AM »

Quote from: Choking Hazard;88445

We should all be doing this on one big workshop. It looks like at least 3 or 4 folks are currently addressiung the "mess". I am at the same decision point. I thought:
1. The smaller, angled nipple off the side of the TB connested to the vac diaphram (what does it do?) on the fuel rail.
2. The large hose from the front of the valve cover connects to the black rubber bellows on between the TB and MAF.
3. The large hose from ICV connects to the underside of the TB.

Does that sound right to people who have already done this?

Mine is different; the ICV line goes to the rubber bellow. The PCV line goes directly under the TB. The rubber below where you guys have a nipple to attach the PCV line is capped on mine.

Rafiki · « **Reply #228 on:** February 26, 2010, 11:21:58 AM »

Haha looks like we are all suck on the same part.

Chalino · « **Reply #229 on:** February 26, 2010, 11:25:17 AM »

After further investigation, it looks like vehicles produced before 10/1991 have a TB without the nipple on the underside; see below:

10/1991 and on vehicles have this one:

It makes sense for the ones with the later TB to have the port on the rubber bellow capped off.

Rafiki · « **Reply #230 on:** February 26, 2010, 04:45:39 PM »

haha nice investigation skills.. so we should still run a hose from valve cover to that nipple on the TB?

BlueBMW · « **Reply #231 on:** February 26, 2010, 06:28:15 PM »

Weren't the throttle bodies changed as part of a service bulletin? For the whole freezing issue?

Rafiki · « **Reply #232 on:** February 26, 2010, 09:58:13 PM »

i didnt exactly look at the dates you posted earlier. my car was built 9/90. and has the nipple on the TB.

4banger · « **Reply #233 on:** February 26, 2010, 10:05:13 PM »

my 4door has a build date of 10/90 and has the tb has the nipple.

Rafiki · « **Reply #234 on:** February 28, 2010, 05:57:56 PM »

finally finished this today! car runs great. for some reason it developed a fuel leak right next to the fuel filter. and im not sure if it was because i messed with the injectors/fuel rail, and hoses up front...

thanks for everyones help!

AtlBMW · « **Reply #235 on:** February 28, 2010, 06:39:19 PM »

You guys have both intrigued and discouraged me from doing this. My car has started to hunt for idle at times (mostly when it is warm) and I suspect a cracked hose.

Question, under the intake manifold there is a hose that is just laying there not connected to anything, like a drain or overflow or something. Seems odd for it to terminate there. Anyone know what I'm talking about and what it is?

Rafiki · « **Reply #236 on:** February 28, 2010, 06:41:44 PM »

Quote from: AtlBMW;88574

You guys have both intrigued and discouraged me from doing this. My car has started to hunt for idle at times (mostly when it is warm) and I suspect a cracked hose.

Question, under the intake manifold there is a hose that is just laying there not connected to anything, like a drain or overflow or something. Seems odd for it to terminate there. Anyone know what I'm talking about and what it is?

i dont think there should be a hose just ending into nothing. snap a picture

thedguy · « **Reply #237 on:** February 28, 2010, 09:59:15 PM »

I'm gonna be doing this, hopefully come next weekend. While ordering up parts I picked up the shorter studs for the TB... how exactly do I go about removing/installing the new ones? doubling up the nuts and torquing it down that way?

4banger · « **Reply #238 on:** February 28, 2010, 11:57:18 PM »

Quote from: thedguy;88581

I'm gonna be doing this, hopefully come next weekend. While ordering up parts I picked up the shorter studs for the TB... how exactly do I go about removing/installing the new ones? doubling up the nuts and torquing it down that way?

double nutting it will work. my threads were mangled(i blame the patron haha) i wound up welding the nut to the stud and turning them out.

AtlBMW · « **Reply #239 on:** March 01, 2010, 01:49:07 PM »

Hate to high jack this thread. My idle issue is minor at this point, only hunts on occasion and mostly when warm .

For some reason I am unable to upload the pic, error but no explanation.(privilege not earned?)

The hose in question is connected to the hose that runs into the intake boot.

http://www.flickr.com/photos/13396116@N00/4400461283/