525I mystery vacuum pipe

[whiskychaser]

HI. I have a 92 525i auto. In the hose between the inlet manifold and servo is a one-way valve. Off this valve is a small T. Clearly this should be connected to something as its dragging in air. Was told by BMW it may go to the trottle housing behind the butterfly or to the DME through the bulkhead. Cant find anywhere it could go. Anybody help with this one plse?

[Jon K]

A pic is necessary

[joshua43214]

its a vacuum source for accessories. It may not be used on your car, if you can't find a loose vacuum hose anywhere, just put a cap on it.

[t_marat]

Like this?:
http://www.bimmer.info/forum/showthr...ghlight=vacuum

[whiskychaser]

A pic is necessary

Attached (hopefully) is a pic of the one-way valve showing the small outlet at the bottom. Blocking it off improves the idle but thats only to be expected. I cant find a hole in the bulkhead a pipe may go through or any loose plumbing.

[Jon K]

Ah yes the elusive "random" vacuum nipple. Some people have something on it some people do not. It supposedly leads to the cabin or something... I dunno I dont have it.

[joshua43214]

Just put a cap on it if you cant find any accesories it runs to.

[t_marat]

I had it open also. Saw in other cars that it is capped. Did the same with mine.

[shogun]

I am not sure if that is the same function. On E32 750 in German specification the throttling valves (EML type with motor) have an additional disturbance air valve installed. On other spec cars these studs on the throttling valves are just closed with a rubber cap. Function of this valve is to open this valve during the inspection for TUV (German road certificate testing) to see if the ECU reacts very quick on additional air or vacuum in the lines. Emission related subject. Here is such a valve installed, my Japanese version does not have one, just a plug
http://www.bimmerboard.com/members/s...erventilDK.jpg

[t_marat]

I think whiskychaser does not havea an EML. or am I wrong?