The mess under the intake

[docgoku]

I could think of two things. 
The hose not being a heater hose/or other high temp hose....or a kink that was so "closed" it built up back pressure and the block side wasn't tight enough.  I'm assuming the hose popped off the block.

If I had to do that particular hose over again, I would get the part number mentioned here for that hose, 11511739245.
Then cut of the last 90* turn at the top.  That hose is from the E36 and snakes around much better, no kinks, and each end fits their nipple/connector perfectly.  Apparently it's 16mm where it connects to the plastic coolant connector and 10mm where it meets the engine block.

I don't like how mine has a kink in it..but it does flow. 
Since a bunch of people have just capped off that whole line anyway, my thought was at least I have some flow.

[Slowered318]

Doesn't standard heater hose have a green stripe? The hose type/size you used is likely the problem. Don't take chances this time around, get the e36 moulded hose.

[david318vert]

Ya what i did was use two hoses one that fits on the junction and the other on the block and connected them with a L shape thingy    i got the lines from autozone. so there not coolsnt lines?
Thank you

[docgoku]

Pictures?

[Slowered318]

Hats off to you if you somehow found a 3/8 to 5/8 barbed elbow.

I gave up and started looking at other BMW's with the same block mount heat pipe. That's when I came across the PN 11511739245.

[david318vert]

it wasn't a elbow deal it was more like a adapter i believe... i cant remember of the top of my head.
ok so i just took of my intake manifold and found that the hose that comes from the coolant junction to my heater core was kinked in one spot so it blew where it connects to the junction breaking of the nipple to the junction.

thank you

[2ruble]

So - questions - I did this about a week ago (before seeing this thread) and have now looked through all 26 pages. My questions are regarding the vacuum, I know that people have run the vacuum slightly different on each car but there is a general agreement on where everything should go. In the pictures below (taken from engine pictures above) I've tried to show a representation of how mine is routed and would like some suggestions on whether it's fine or I should fix it. The car would idle high once warm when I bought it, I have since does both manifold gaskets and this plate delete mod - after doing a (homemade) smoke test to try and find any vacuum leaks - as the car still idles high (between 1,400-1,600 RPMs) once warm.

The first picture shows (in paint  ) how I routed my VC hose - I brought it to a 'T' from the ICV to the intake elbow

The second picture circles a port on the TB that there is a hose coming from that is plugged in to the TB side of the intake boot (red angled/'V' in third picture)

I am also missing "8" from the second picture - don't know how necessary that is.

Lastly - I've seen posts that this TB is only on post 10/1991 production cars, but mine is 9/90 (per realoem)

Anyway - I've seen people route the ICV to the elbow of the intake boot and the VC hose to the TB port of the intake boot but what about that 45* port on the TB (circled in pic 2)? I've also seen people route the ICV to the TB side of the boot and the VC hose to that little port that's circled - but then what about the port on the intake elbow?

I know pictures of my car would help but I can't get them until later (at work) - if all of this is fine does anyone have another suggestion on why it might idle to 1,600 when warm? And if a vacuum leak the best way to find a leak somewhere?

Thanks in advance

[DesktopDave]

I'm a bit confused by your description, but IIRC the VC hose goes to the large TB nipple on the early M42.  The TB nipple bypasses the throttle plates.  It's plumbed into the intake plenum, providing constant vacuum to the VC.  I'd guess that when you tee'd the VC pipe into the ICV, you're adding a bit of blow-by gas & oil into the ICV, making the mixture rich, thus running a high idle.

I always figured that the ICV won't work correctly unless it bypasses the throttle plates in the TB.  It must take air from one of the elbows off the intake snorkel before the TB.

Mine is plumbed up this way:
Intake manifold  --> FPR
TB lower nipple --> Valve Cover
TB side nipple --> fuel vapor control valve --> charcoal canister
Intake manifold lower runner nipple --> brake booster check valve --> brake booster
Intake snorkle elbow --> ICV --> extreme rear of intake runner near firewall
The 2nd intake snorkel port is plugged.

Measure your coolant temp sensor resistance too - should be very high when cold and very low when warm.  If that's sending the wrong signal your car will tend to run enrichment cycle (high idle) despite being fully warmed up.  You'll see poor fuel mileage too.

[2ruble]

I'll snap a couple pictures when I leave work today so you can see - but what you're saying hopefully will help with that idle... because it's definitely not set up like that... lol

Also, does that half washer looking thing (part 8 that sits between the TB and the intake arm) need to be there? Or is that nothing?

[DesktopDave]

I'll snap a couple pictures when I leave work today so you can see - but what you're saying hopefully will help with that idle... because it's definitely not set up like that... lol

Also, does that half washer looking thing (part 8 that sits between the TB and the intake arm) need to be there? Or is that nothing?

That half-moon bracket is a retainer for the lower TB heater plate.  I'm pretty sure I left mine on too, even though I deleted the heater.

[2ruble]

I didn't replace the half moon thing - I still have it (maybe)... but it doesn't seem like it affects anything...

Here are the pictures of what I had before your post (changed it all around last night when I got home) - I cleaned out the ICV as best I could and put it all together and there is no noticable difference... it still idles between 1,400-1,600 at a stop and when coming off the highway to a stop (or being in throttle pretty hard) it'll bounce/pulsate from about 1,000-1,600

First is that elbow from the TB port on the intake arm to that metal nipple - this thing was there when I bought the car so don't blame me
Second - the T junction I put in (now ICV goes only to intake port by box and VC hose goes to that metal nozzle on the TB)
Third - shows the hoses coming from the T going to the intake elbow and under/around to the VC port
Fourth - is just a step back shot of the routing - red = the T where the VC and ICV hoses connected; yellow = weird recirc elbow thing

But now it's setup how you said (and others have pictured) - ICV goes only to intake elbow, port on intake arm closest to TB is plugged and VC hose goes to little metal nozzle thing... Thanks for that - now I need to solve the idle/pulsating issue... and get new (to me) injectors as these are ridiculously loud

[Slowered318]

Looks like the previous owner or his mechanic struggled to repair/replace the vacuum lines. Have you checked the throttle body and cable is not binding up? Also is the brake booster functioning properly, it should hold vacuum even after you turn off the engine. So all the line are routed correctly and the ICV barbed fitting is pointing down?

Not a short term problem but you have used "heater" hose when it should be vacuum or something with resistance to oil/fuel. 

[docdrey]

Just started this yesterday. Beautiful thread. SOOOOOO much help here.

[docdrey]

Just finished. Lol forgot to tighten the manifold half that bolts up to the head and had to take it back apart. Other than that, this is awesome.

[mabeer]

recolored the picutre.  That purple and blue was a little hard to see.  Nelson_40 and/or Blue BMW (or someone else?) look to have made these images and they are the best diagrams!  Many thanks to them.

Sorry for the ancient bump but I believe the dark blue lines from the heater Core Inlet/Outlet are reversed.  The bottom should run to the head and the top should run to the plastic pipe as depicted in the first image below. Originally posted by DRTE30 in this post http://www.m42club.com/forum/index.php?topic=17914.msg122920#msg122920  I was freezing my tush off until I made the switch.