Ok I have a S5 nonturbo with a recently bought rebuilt motor with 12k miles (has good compression, or at least 6 good pulses through poor man's comp test) that's been idling at 3000 rpms with a small blip to 2900 and back to 3000 when fully warm, but through search, i found that, on 3rd gens it seems, there's supposed to be a vacuum plug for the pcv nipple (or that's what the person who found this problem said) on the UIM. After searching around, i did find a plug on the ground in my garage, but the problem is, where does this plug go? I know there's a plug on the LIM on the left of the 2 tubes, where the right tube goes to the pressure sensor, but I'm not sure if the 2nd and 3rd gens have these same vacuum tubes that are to be plugged. I was wondering if anyone knew where this vacuum plug goes to?

Also, I bought a new stock clutch system (PP, clutch, pilot bearing, t/o bearing) for the car with an aluminum flywheel, and I notice that when I put load on the engine, the rpms would bounce and try to stagger up the rpms. It is less so pass 3-4k. I also hear a "whurr" near or inside the transmission when this is happening. Since if the clutch is slipping, the engine shouldn't be having any problems revving so I was wondering if a mis-installed clutch can cause this? Or can the idle/vacuum leak problem be related to this? When I dropped the motor in, I did so with relative ease so I do not think I damaged anything. Any input would be greatly appreciated

 

I don't know about your clutch, but if you want to adjust your idle there's a screw on the top of your throttle body that can be used for basic idle adjustment.

 

Hmm i don't think the TPS would cause such a crazy idle would it? The engine prior to this one idle'd fine with the same tps. I swapped the throttle body and made sure nothing was tampered with. I also don't have any meters to check for the TPS voltage so that may be a small problem. (i'm no good at electronics). I'll also check the accelerator cable but I SERIOUSLY doubt that that is the problem. I seriously think that vacuum leak is the main culprit because I have, in my hand, a vacuum plug that has popped off. Oh and the "whurr" sound is only heard when there is engine load and when the the rpms is staggering.

 

Well, I used the screw at the top center of the throttle body to adjust my idle from 750 to 2500(overshot it) and back to 1500, so I imagine that that little screw can actually affect your idle speed quite a bit.

 

could be larger injectors in the primaries.

 

I have messed around with my TPS but without porper tools i don't think i can do much... from what I understand, tightening the screw would bring the idle down correct?
also
my wiring harness came off of my old engine so the fuel injectors are stock. I have a really small vacuum hose plug just itching to be plugged back in, I was just wondering if anyone knew where this plug went? I've looked around my engine to no avail....maybe i'm just not looking hard enough...and plus it's 1 am in the morn

 

the injectors are not on the wiring harness, they are on the engine itself. under the upper intake manifold

 

Sorry I'm kinda tired, but I know for sure the injectors are fine. They came directly off the blown engine into the rebuilt one. But even if i did have larger injectors, wouldn't it only cause it to run richer, not cause the idle to go up?

 

Well I replaced stock injectors with 680's, caused me to idle at 2k. Car ran funny, rich, etc
BTW I have a standalone. Might be different with stock.

 

Yes i do have a stock ECU...your case may have easily been the standalone =)

 

Nobody knows which vacuum tubes are usually capped? I'm dead sure it's a vacuum tube not being capped, which is causing the massive vacuum leak and 3000 idle. Can a vacuum leak also affect the car from starting, thus flooding the engine?