I'm sorry I had a thread a week or so ago about a vacuum leak; I thought I had found it. I'm hoping I can get by with starting a new one without any verbal lashings.

Is there anyway to form a vacuum leak between the rotor housing/center plate? I've searched everywhere, I have no vacuum lines, I've jb welded and vacuum capped off every line, and I've redone all of my intake manifold gaskets.

If I spray starting fluid under the upper intake manifold on the driver's side, on the housings, it revs up and idles.
When I spray at it from the front, left of the alternator(under the manifold on to the housing) the engine revs up.
I've checked all the manifolds, with starting fluid, to see if any of the new gaskets were bad or if maybe one of the mating surfaces weren't even.

I'm stomped. It smokes a lot when you first start it but that is just from the oil o-rings .

The leak sounds like someone running a vacuum cleaner under 2000 rpm. Anything above and it runs decent.
I was on the highway and had to downshift/speed up to avoid a guy trying to merge on top of me. That's when I first noticed something was wrong with it. As soon as I pulled over I could hear it.

I've replaced all of the fuel injector o-rings and I know that it isn't the problem. All the injectors are really snug in their holes.

 

If there was a gap between your housings that was causing a vaccum leak, you'd notice the abundance of hot coolant spraying all over your engine bay and thick clouds of white smoke out of your exhaust before you found an air leak. (google water jacket)

My guess is that either your oil-injector grommets need replacing or the gaskets on your series 5's VDI system need replacing. It's located under the Upper Intake Manifold, behind the alternator.

Also check the gasket at your throttle body and anything around there. In this case, I'd get the engine running, get some soapy water, spray and look for bubbles.

 

It smokes a lot when I start it but that is oil and completely unrelated. Oil o-rings are worn out I think.

I have the OMP removed and all of it is blocked off so it isn't coming from that. It is an s4 so there isn't a VDI.

Everything on the car is removed. There isn't a vacuum spider anymore and everything has been either capped off or jb welded closed.

If I can't figure it out I'm going to go ahead and pull the engine because I don't want to spend anymore money trying to fix something that is going to come out in a few months anyway.