The mess under the intake

[bimmerd00d]

^^^^  So this is where i'm supposed to connect the Valve Cover > Throttle Body vacuum hose?  I end up with an extra hole in my intake boot then.  Do i cap that off or the one pictured above?

EDIT:  I just said screw it and plugged it up. She purrs like a kitten now. Too late to try to bleed the coolig system, so I'll button it all up tomorrow. Thanks for the awesome info throughout the thread.

[BlueBMW]

The picture I posted up there is a theoretical retrofit mod I came up with.  (Using E30 and E46 parts)  I dont even know if it would work or not.  From what I can tell looking at the real oem diagrams for the M42, the hose from the valve cover eventually connects to the throttle body on the bottom.  It looks like it goes through a little junction with coolant running through it first though.

[DesktopDave]

I'll bet that 2nd vac port is for differential vacuum.  It looks like it closes off the oil separator from the booster diaphragm, if my guess is right.  That'd be the ticket for small displacement engines.  

There are times that you wouldn't want that valve open, like when low vacuum at high rpm would permit the high-pressure crankcase to force oil past the booster and into the intake manifold.

That oil separator is a good idea though...but the BMW part might be too overcomplicated.  I heard they had some troubles in northern climates with humidity freezing them open on newer BMWs, figured that was at least partially right.

[BlueBMW]

There are insulated units on some of the cars for that very problem.  Seemed like the X5s specifically had fully insulated valves and hoses.  

You're probably right about the vacuum port.  There is a diaphragm in the top half of the valve if you take it apart.


I was told today that the vacuum line off that E46 vent valve is a supply line for some regulator, so it may not actually be a control line.  Still not totally sure.  After cleaning the gunk out of my intake ports, I'm starting to reconsider some sort of oil separator!

[Rafiki]

so, im trying to sort through all the info in this thread.

I am wanting to do this, but i am confused because of all the different things i am reading.

I want to remove the heater plate along with doing this. But i do not think i want to plug the nipple on the block.

What hoses do i need to purchase? the original posts says 1 vac hose, and then goes on in the pictures to say you need two.

Just wondering how many vac hoses i will need, heater hoses.

[teh Phil]

so, im trying to sort through all the info in this thread.

I am wanting to do this, but i am confused because of all the different things i am reading.

I want to remove the heater plate along with doing this. But i do not think i want to plug the nipple on the block.

What hoses do i need to purchase? the original posts says 1 vac hose, and then goes on in the pictures to say you need two.

Just wondering how many vac hoses i will need, heater hoses.

I only specified the diameter, not the number of hoses needed. I bought a foot or two of bulk hose and cut off the pieces as I needed them. If you are deleting the heater plate but keeping the nipple on the block then the only coolant tubing you would need would be from the coolant pipe to the nipple on the block. All of the other tubing would be vacuum hose (with the exception of the new fuel injector hose for the injectors, of course).

[Rafiki]

I got a question for you guys



these two both fit in both places. the one on the block, and into the filter canister. anyone know which one goes where

one is wrapped up with the other electrical connector and one is alone

[BlueBMW]

One is the oil pressure sender, the other is the coolant temp gauge wire.  They'll both plug into each other's connectors.  I'd plug them in and turn your key on, if your oil pressure light comes on (maybe a bit dimmer than normal though) then I'd say you have them swapped.  

When I had my intake apart I had them swapped going back together.  I was scared when I saw the oil temp warning indicator on.. and when my temperature didn't seem to go up.  I was able to reach back in and swap the two connectors with the intake etc installed.

Oh and nitrile gloves FTW!  I cant stand to work on a car without gloves on anymore.

Oh and I think the one that's attached to the other wire is the one that goes to the oil filter housing.  The one going solo goes to the block I think.  You'll know if you get them wrong though!

[4banger]

started mine today. what a fucking mess my intakes are. 20yrs worth of oil and gunky shit built up in the them. i havnt had a intake off a m42 in so long i forgot what a pain in the nuts they are lol upper intake is in the parts wash soaking and i still need to get the lower intake off. all my hoses under the intake were leaking and rotten.  injectors and adjustable fpr are going in as well. gotta order gaskets and shit this week.

[4banger]

wow is that coolant pipe realy $238 fucking dollars?

[tjts1]

wow is that coolant pipe realy $238 fucking dollars?

http://www.autopartswarehouse.com/sku/BMW/318i/EZ/Cooling_Hose_Connector/1991/Base/4_Cyl_1-dot-8L/W0133-1662171.html?tlc=Engine+%26+Drivetrain

[Jorgeconrico]

Mine was 30 bucks from the dealership.

[4banger]

pelican has it listed as $238 thats why i asked.

[tjts1]

Pelican and bav auto are over priced and over hyped. The $15 pipe will work just as well.

[4banger]

thanks. i need the pipe 5/8 heater hose and 19/32 vacuum hose and thats it? i didnt cut the fuel lines. they came right off the hard line. anything else i need besides the gaskets?