Hey All,

If the air pump is buggered, could it be the source of a vacuum leak and/or limited boost?

Is the same air pump critical to the operation of the car? The below codes fired while it was sitting at a light - kinda irritating, but am not well versed on how it works and what it is meant to do. Could have knocked something loose while I was looking for the source of the vacuum leak yesterday? I should really learn and stop sticking my hand in the engine compartment...

Comments welcome.

Cheers,

 

The air pump blows fresh air into the exhaust manifolds when the car is stopped, so it makes sense that it would show up when you were at a light. If you have the "E_996T_Katalog" it's on pg 52. The blower (#1) is hooked up to a vacuum operated valve on the passenger's side head (#14) and there is a stainless pipe that crosses to the driver's side head (#7). The vacuum solenoid (#17) opens the valve when needed. (The rest of the stuff on that page is the recirc valves & boost control.)
Since the air supply lines are either hard lines or clamped tubes you can't really knock them askew. I suppose you could have knocked off the vacuum lines - the supply comes from the "cross" under the throttle body (#30), goes to the vacuum solenoid, and then to the main valve. This is all on the rear corner of the passenger's side head so if you were in that area you could check. I have pictures somewhere that I can't find...

 

Sorry can't read your codes the image gets too pixellated. I believe when my recircle valves failed I got SAI codes. Also when the SAI ran at cold startup my car would have a very harmonic sound coming from the engine bay. If you have never replaced them they are likely due.

 

Thank you Sir(s),

So, it is not critical to the functionality of the car, less so than it is just an irritant?

Can this be the source of the low boost issue?

Cheers,

 

https://rennlist.com/forums/996-turb...questions.html

 

Thank you Dock, I was reading a similar post on six speed last night that did not address the question...

 

Well just drove it in traffic for an hour and a half and I was unable to recreate the air pump codes, and I was only able to see about .6 bar. Am thinking they may not be related.

 

The air pump is only for smog purposes. You can just remove it, cap the line and turn it off in the ecu settings.

I could be wrong, but i believe the line to the air pump is behind a check valve, so it doesnt see boost pressure. But i could be totally wrong on that.

 

I take it that may be difficult with the engine in the car.

Car is otherwise running well, even with .6 bar!

 

That's only ~0.1 off of stock boost.

 

I usually saw .8 before the tune, 1.2 after... X50...

 

So you're ~0.1 off of stock non-X50 boost.

 

Which is, if I am not mistaken, the mechanical strength of the waste gate spring, so it would appear there is no boost control.

 

I have no idea.

Can you drive it down to Kevin's shop? I'm sure he can fix it.

 

I am not allowed over the border at the moment without as mandatory 14 day decontamination on the way back. I have Kevin's new wastegates, but have no idea when the replacement turbos are coming. I was looking at the passenger side turbo yesterday and it doesn't look too happy, but if one turbo has a sticky WG, that should not impact the second, one wold think...