randerson22

I need a little help. I have a '95.5 S6 avant with an Intended Acceleration stage III+ chip, have had now for over a year. The prior owner did the important Samco hose upgrades. Still has the stock bypass valve.

When not really pushed hard,t he car drives fine. But just the other day, I noticed that when I gun it, and the intake pressure gets up to about 5 psi (not much), I can feel the car stammering, and it doesn;t seem to be able to go much beyond 12 psi, and between 5 and 12, it is stammering like the fuel is being cut off & on intermittently.

Would this be the bypass valve? I hear they frequently go. Or a different hose? Where would you start in the diagnosis procedure? If it is the bypass valve, would you recommend the pricey Forge one, or the upgraded Bosch one I read is defintiely better?

Help, I want to see 24 psi again on my gauge.

Regards,

Robert Anderson
1995.5 S6 avant, IA stage III+, ECS big red kit, Eibachs & Billstein sports

padriug

If you do a search on this, you should be able to find a nice pic indicating the line I'm referring to. HTH.

Patrick
92 S4

EvanUrS4

That Diaphram vac line usually is all or nothing in my experience...but possibly.

randerson22

Hmm,

I see some discussions about this, but no pictures. I removed the plastic piece and looked back there. I see the 3-way connection, and nothing looks loose there, but when I follow one of the lines towards the fire wall, I see a rubber hose with a clamp around it, and there is a slightly smaller diameter hose that is apart from this larger hose. But when I pull it back, I see that there is a tube inside this, so I am not sure if this just protects the tube, or whether the fact that the two hoses are seperate might be the source of this problem (i.e. that there is a vacuum leak here).

I can see that if I remove the existing hose clamp, I would be able to place the smaller one inside the larger and clamp them back together.

Sorry, I am no mechanic. A photo would be worth 1000 words. Any idea how long ago this picture might have been posted?

Thanks,

Robert

EvanUrS4

<center><img src="http://pictureposter.audiworld.com/39395/checkthisbadboy.jpg"></center><p>

randerson22

what I did, which did not work, and then perhaps you can help me determine if this was the right one?

I saw a place near where you circled where there is a whitish long plastic tube that has an outer hose of one type (thin wall, reinforced) and a slightly larger rubber hose right next to it that is a thicker wall, different ID and OD, and a clamp around that. The two hoses were not connected, so I removed the clamp, was able to force the smaller hose around the other hose and clamp them togehter.

But logic would dictate that the internal plastic tube carries the pressure, and that is the one that matters. The external rubber hoses seem to be just protective. Now if I follow this more to the right (and further to the right than on your photo), I see a spot where there is a tube connection with the whitish plastic. It seems to have come out slightly, but it apprears that it is still connected (hasn't come out totally). Is this what you mean? It is quite a bit further to the right than in your picture.

Perhaps you can describe the connection point a bit. Sorry, I have no Bentley manual (my next purchase).

Thanks in advance,

Robert


, but to me it seems that the internal one size hose and a smaller one on