Mess under the intake HELP with hose routing

[kkamakasi]

I do not understand where the hose from the valve cover is going to. The diagram says it routes to the BOTTOM of the TB as below (the orange line going from the valve cover to the TB):



But here is the bottom of my throttle body. There are no ports to connect the hose to. There is just this bracket there.



I think the bracket used to hold this thing.. maybe. Can't remember. Am I supposed to keep this weird plate hose thing on the bottom of the TB and connect one of the ports to the port on the valve cover? If so, what about the other port on the weird plate hose thing? Where does IT go?
[IMG][/IMG]

[kkamakasi]

actually, I think these guys are talking about the same thing but I dont get it by just reading it. http://forums.bimmerforums.com/forum...e-hose-routing
Could someone post pictures to help me route from valve cover to TB and such?

[kkamakasi]

actually, now just found some thread on m42club that says to connect a hose from the valve cover to the intake boot. But it also says to connect a hose from the idle control valve to the intake boot.

WTF...

[AndrewBird]

What year is your car? Some throttle bodies did not have that port on the bottom. This is what yours would look like if it had the fitting:



In your case, using a T fitting and hooking it to the intake boot will work fine.

That other part you post that was attached with the clip is used to heat the throttle body. Coolant flows through it and heats the throttle body, keeping it from icing up. It is not needed however unless you are driving around in 30 below weather all the time, and even then, you will be fine without it.

[kkamakasi]

Got it!

Mine is a 1991 318i sedan.

I didn't know the intake boot had two fittings for two vacuum hoses to hook up to.

[roguetoaster]

I do not understand where the hose from the valve cover is going to. The diagram says it routes to the BOTTOM of the TB as below (the orange line going from the valve cover to the TB):

I think the bracket used to hold this thing.. maybe. Can't remember. Am I supposed to keep this weird plate hose thing on the bottom of the TB and connect one of the ports to the port on the valve cover? If so, what about the other port on the weird plate hose thing? Where does IT go?

Glad you pointed this out, at the time I made the diagram I didn't know a TB without a lower barb existed. Now I have an excuse to remake the whole thing with proper colors and all.

It also explains why the intake boot has two ports.

I am also curious if your car ever had heater plates as I don't see the "ears" on the TB where the retaining plate would be attached?

[kkamakasi]

My car did have the heater plate. I removed from the car when I removed the "mess".
I routed the hose from the valve cover as well as the hose from the idle control valve to the two ports on the intake boot.

The hose from the idle control valve had to be re-routed on both sides of the ICV because the electrical connector to the ICV was too short to try to route the hose to the intake boot and it would have required too many elbows and what-not. So I just increased the length of the hose on the other side of the ICV and then relocated the ICV to closer to the intake boot to connect the other side hose to the intake boot... it all makes sense in my head. I hope what I am writing conveys this...

[roguetoaster]

My car did have the heater plate. I removed from the car when I removed the "mess".
I routed the hose from the valve cover as well as the hose from the idle control valve to the two ports on the intake boot.

The hose from the idle control valve had to be re-routed on both sides of the ICV because the electrical connector to the ICV was too short to try to route the hose to the intake boot and it would have required too many elbows and what-not. So I just increased the length of the hose on the other side of the ICV and then relocated the ICV to closer to the intake boot to connect the other side hose to the intake boot... it all makes sense in my head. I hope what I am writing conveys this...

How odd, do you remember how the plates were retained?

Yep, increasing the length of the ICV hoses is the way to go, and your explanation makes perfect sense. Perhaps the diagram should include approximate lengths of hose needed and diameter.

[kkamakasi]

How odd, do you remember how the plates were retained?

It may be hard to comprehend but if you look at the bottom of the throttle body in the picture below, you will see a nut (where yours shows a nipple/port to connect a hose. That nut is holding a piece of metal bracket that holds the heater plate in place.

[roguetoaster]

It may be hard to comprehend but if you look at the bottom of the throttle body in the picture below, you will see a nut (where yours shows a nipple/port to connect a hose. That nut is holding a piece of metal bracket that holds the heater plate in place.

I get that it was holding the little two port jobbie that fits in to that little space on the bottom of the TB. But I really wanted to know if you had one or two of those plates highlighted in purple on the routing diagram. My assumption is that you only had the one that goes between the TB and intake manifold, and not the one that would normally go below the TB, right?

[AndrewBird]

The "port jobbie" is his heater. Throttle bodies without a fitting use this style while TBs with the port use the U shaped heater.

[Vivek]

You can just vent the crankcase to the atmosphere, it really doesn't matter.

[roguetoaster]

The "port jobbie" is his heater. Throttle bodies without a fitting use this style while TBs with the port use the U shaped heater.

Yes, I get that the oval two port thing is the lower heater, but I was wondering if that setup included the plate between the TB and manifold.

[kkamakasi]

Yes, I get that the oval two port thing is the lower heater, but I was wondering if that setup included the plate between the TB and manifold.

I'm not sure if the PO removed the plate heater between the TB and manifold.. but it wasn't there when I dug into my engine.