Not at all. I've read about the issues of aftermarket BOV adapters (not that I liked the idea of one anyway). I do though have one modification to the intake system that in my eyes looked as a suspect, the ITG CAI. Now I know you'll probably say it's just a Cold Air Intake, what harm can it do and maybe it's true, but at the moment I can't figure out another cause. Car had been fine for 3 years, then 1 month after the CAI upgrade i got that error. Allegedly it didn't have to do with it, the manifold was replaced so I put back the CAI and 1,5 months later I get the same fault. Coincidence? I don't believe too much in them. 

 

Surely when I cleared the fault and put back the stock filterbox the fault re-appeared, does this mean it doesnt have to do with  ITG? Maybe but it may also be that once the ITG triggers an alert or damages some sensor/part then putting stock filter in doesn't cure it, something needs replacing.

 

Too confused at the moment. It's the rareness of the fault that worries me. I would know which way to go with silly oil consumption, misfires etc. but this fault is not often encountered AFAIK. Even less an inlet manifold failure (supposedly that it's the same part that has failed again).

Edited 15 July, 201411 yr by newbie69

ITG and the like are atmospheric side of the engine so it doesn't matter really. Take it all off and have a pipe with nothing on it and it will run OK as well - just grit will eat away your engine internals .

I bet it is something silly

I hope so. I would hate to cancel the whole stage 1 / fmic upgrade...

Pre-visit update:

 

Car is booked in for tomorrow morning but thought I'd go out and re-scan, just to see how many times the fault had re-appeared during the last 3 days I've been driving the car as normal. Result? None, BUT I had a new one showing up, again having occured only once:

 

So:

 

2 Faults Found:

4050 - Leak in Air Intake System 

          P2279 00 [237] - Lower Limit Exceeded

             Freeze Frame:

                    Fault Status: 00000001

                    Fault Priority: 2

                    Fault Frequency: 1

                    Mileage: 46166 km

 

4270 - Turbocharger Bypass Valve Control Circuit: Malfunction / Open Circuit 

          P0033 00 [109] - Defective

             Freeze Frame:

                    Fault Status: 00000001

                    Fault Priority: 2

                    Fault Frequency: 1

                    Mileage: 46175 km

 

Readiness: 0000 0000

 

So, "Turbocharger Bypass Valve Control Circuit" ? Any ideas?

See page 14   to 32, 33

this is the older less powerful engine, if there is no leak & air getting in after a sensor, it might be one of the senders or Sensors faulty.

 

http://volkspage.net/technik/ssp/ssp/SSP_359.pdf

Twinchargers work in naturally aspirated mode at very low loads. This routes the air bypassing supercharger and turbocharger - O believe george posted nice vid recently. Might be the failure of this bypass valve was introducing unmetered air into the system hence the first error code?

Thanks I had deleted that document and was looking for it.

 

Searching for "valve control unit" sends me rather on to pages 47,48:

 

"Intake manifold flap air flow control valve N316

 

Task

It is controlled by the engine control unit and opens 

the path from the vacuum reservoir to the vacuum 

control element. The intake manifold flaps are then 

operated by the vacuum control element.

 

Effects upon failure

If the valve fails, it will not be possible to adjust the 

intake manifold flaps and the flaps will be moved 

to the open position. This worsens the combustion.

 

If I understood this correctly, and if this is the case, the supercharger must currently be deactivated... Hmmm, I have been driving rather carefully lately so I didn't realise. I will notice if this is the case tomorrow when I drive to the dealers.

 

 

Scrap my last post. Not the thing I was thinking about. Look at page49. It's N249 whoch I think your error code is refering to.

Edited 16 July, 201411 yr by Jabozuma

Ah,

as read on page 49,  'the noise'

 maybe exactly the failure that the new member had with the Replaced engine now getting a new turbo.

 

Scrap my last post. Not the thing I was thinking about. Look at page49. It's N249 whoch I think your error code is refering to.

 

 

Yep, either that or N316 which I referred to above, the way I understood it by trying to link the fault code description and the TSI manual. I guess I'll see tomorrow. My further question is whether this was a one-off incident and whether I should abandon my stage 1 plans, or it's a failure that could have happened to any car if the part happened to be faulty from factory...

Edited 16 July, 201411 yr by newbie69

I think that it is a mechanical failure, no more no less and could have happenwd to any car. Should be fixed and that's it - all mechanical things break. Some sooner some later. I'd not base my Stage 1 decision on such a thing.

Update:

 

Car is repaired and all is fine again. 2 different faults and 2 different causes but both due to cracked/detached connectors that simply got replaced. I have to admit both damages must have happened during my spark plugs changing, trying to move around the piping which sits above cylinders 1 and 2 and disconnecting stuff. I confessed it to the master mechanic during delivery and he admitted it's not the best design having to disconnect all those hoses and push them away in order to do a simple plug change.

 

So I guess lesson learned: Surgical attention and finesse next time I try to move/disconnect things that are so tightly installed like that dreaded piping. Best thing is it was all done under warranty...   

Great, a simple thing then Result as hoped for - Stage 1 here we come ?

I think yes. I am trying to arrange for a couple of jobs to be done one right after the other while i'm there (dyno, fmic, remap etc) and of course make sure that the total cost for all that won't surpass my planned budget but currently chances are that the project will indeed go on.

Update:

 

Car is repaired and all is fine again. 2 different faults and 2 different causes but both due to cracked/detached connectors that simply got replaced. I have to admit both damages must have happened during my spark plugs changing, trying to move around the piping which sits above cylinders 1 and 2 and disconnecting stuff. I confessed it to the master mechanic during delivery and he admitted it's not the best design having to disconnect all those hoses and push them away in order to do a simple plug change.

 

So I guess lesson learned: Surgical attention and finesse next time I try to move/disconnect things that are so tightly installed like that dreaded piping. Best thing is it was all done under warranty...   

Boom, result!