A1 1.6tdi MAF or intake leak?

[Crasher]

On the back of the block, under the turbo, behind the CAT/DPF, covered byt the drive shaft, impossible to access from above. 6 hours work on a lift in the air for an experienced tech.

Yes, it's in there




A new genuine unit



Removed, the arrow points to stud which is a PITA for snapping

[petrolhead63]

Crasher thanks. Today just for the hell of it I cleaned the EGR stub thingy and pipe at the throttle end...the square type hole in that stub that inserts into the plastic manifold stub was about half size due to soot and muck.
Anyway tried car and within half a mile the glow plug light came on and into limp mode so its duff!
My scan shows pending P2279 Intake air system leak bank 1 as the MIL light not on yet so is pending.
I have the luxury of a 4 post lift in my garage to have a big job on assuming that EGR causes this code......nothing about EGR which our A3 2.0tdi di have when RGR failed.
I am not looking forward to this job.
Regards and thanks....if there is a decent crib/guide on what you have to or dont have to move to remove offending item please direct me someone!
By the way.....if that stud snaps can it be drilled in situ for repair? perha0s heating it before trying to slacken off is an idea?

[petrolhead63]

On the back of the block, under the turbo, behind the CAT/DPF, covered byt the drive shaft, impossible to access from above. 6 hours work on a lift in the air for an experienced tech.

Yes, it's in there




A new genuine unit



Removed, the arrow points to stud which is a PITA for snapping

Crasher, before I go for the EGR........I have underneath found an issue, the intercooler pipe has a small split and has obviously leaked under boost...
SO could tht bring that code up? it is indeed an air intake leak!
Thanks

[petrolhead63]

I thought you would like to know sadly the issue has returned after about 1000 miles. The sorted air leak has meant no limp modes and the P2279 code is clear and not returned. However the P0101 code is back as pending and also current with MIL light on. Periodically the glow plug squiggle light comes on.
I assume we are back to the potential EGR early signs of failure?

[Crasher]

With a CAYC engine an Air Mass Meter issue can become more complex, is the "flow straightener" (AKA expresso tube) still in there?

[petrolhead63]

Hi Crasher, I'm back on this pesky A1! I have not as yet done the EGR because car was at uni with her and having sorted the other matters it was behaving except occasional glow plug squiggle light on.
It now does that and then also MIL light sometimes...
P0101 code again as before.
I know you said the EGR;s are often at fault, but you also mentioned an expresso tube air pipe?? which one is that...though I am pretty sure it is all stock. Regards

[Crasher]

I would fit a new Air Mass Meter first.

[petrolhead63]

Did that at the start of it all because thats the code! as background the car has about 135K on it now and no evidence of an EGR on it before us. It has displayed the glow plug light often, the MIL light occasional but not gone into Limp. The code always the same being Air Mass.