Can anyone help me identify the part just after the hole? The 3 inch cilinder, can't find any info on it. Thanks!

Its a pressure damper. You only need to replace or repair the little pipe where the hole is.

1 hour ago, RickT said:

Its a pressure damper. You only need to replace or repair the little pipe where the hole is.

Thanks !!!  It's a nightmare trying to find a replacement for the pump! They don't show up in any of the main web sites car spare parts catalogs. Does the fact that the pump was exposed for a while might have damaged it? Does this explain the difference in noise that I'm having in the turbo noise at about 80km/h? With no loss of rpm and no extra smoke . Thanks once again for your help.👍

Hi

 

I am ready for others more familiar with diesels to correct me, but it looks like the small (holed) pipe leads from the inlet trunking via the cylindrical pressure damper to the inlet manifold pressure sensor (MAP sensor).  If so, a leak will mean that air will be noisily blown out when under turbo boost pressure, and that the MAP sensor won't give the correct electrical reading for the ECU.  Might be possible to repair the hole with some rubber tube and hose clips.

 

How did the pipe get damaged ?  Something rubbing ? Mice ?  Do let us know.

Which engine is it?

If that damaged pipe simply pulls out of the intake trunking,  could you not fix it fairly easily with some heat shrink sleeving?  Might need two or three layers,  but worth a try.

First I would like to thank everyone that helped me. Second, I haves yeti 4x4 2009 2 .0 tdi 140ch;  I have no idea on how the pipe/hose got damaged (maybe when I changed the battery???) It went undetected for a while. Last week I changed brake the brake pads and when I open the engine compartment to do a minor check wile opening the brake fluid reservoir to facilitate the installation I did not saw it.front and rear suspension changed as well as front springs.

I think that is item 15 here: https://skoda.7zap.com/en/cz/yeti/yet/2010-666/1/131-131080/#15

03L131055DA if repair isn't satisfactory.

17 hours ago, Austin 7 said:

Hi

 

I am ready for others more familiar with diesels to correct me, but it looks like the small (holed) pipe leads from the inlet trunking via the cylindrical pressure damper to the inlet manifold pressure sensor (MAP sensor).  If so, a leak will mean that air will be noisily blown out when under turbo boost pressure, and that the MAP sensor won't give the correct electrical reading for the ECU.

 

Its on the intake side of the turbocharger is it not?

 

Other than partially bypassing the airfilter and allowing a small proportion unfiltered air in to the engine I believe the MAP sensor will give the correct reading, its a bit like fitting a less restrictive air filter.

 

If I have misinterpreted the photo view please correct me.

That's a good point @J.R.; anything connected to the air filter is just getting a cleaned supply of atmospheric pressure air, as opposed to a non-cleaned supply. so that hose leak will have minimal if any consequences.

Hi

 

To correct my earlier post, from studying the parts diagram it would seem that item 17 has an electrical feed and three hose ports.  It is variously described as "Pressure Converter", "Turbo Solenoid Valve" or "Boost Control Valve".  This will convey an electrically variable blend of vacuum or filtered air at atmospheric pressure to the turbo wastegate.

 

So I think the pipe in question simply feeds air at atmospheric pressure to this Solenoid valve, and this air is picked off downstream of the main air filter to make sure it's clean.  As the pipe isn't under pressure, a reliable repair should be easier.

Edited 20 July, 20205 yr by Austin 7

To everyone: it seems reasonable to assume that the cylinder is fed by a vacuum hose that gets its filtered air at the main air filter. Second this vacuum hose then departs the cylinder to go to the N75 component that regulates the air mixture Ang egr  to the turbo. The question remain, what is the function of the cylinder?(there is no power supply or electrical wires)

Googling the part number on it (03G129808C) yields a few results in line with an earlier poster's description as 'pressure damper' or similar.  Buy a cheap one on ebay and cut it up for a look inside?  Hacksaw is by far the best analytical tool... 😁

Whatever it does, your hose leak won't be stopping it from doing it.

7 minutes ago, Wino said:

Googling the part number on it (03G129808C) yields a few results in line with an earlier poster's description as 'pressure damper' or similar.  Buy a cheap one on ebay and cut it up for a look inside?  Hacksaw is by far the best analytical tool... 😁

Whatever it does, your hose leak won't be stopping it from doing it.

I agree, Brut force the crap out of it to see what oozes out! A bit pricey for 30 quid on the net!

Agreed, £30 is too much to spend on finding some sort of labyrinth inside a plastic tube. Patch it and carry on.☺️

51 minutes ago, Wino said:

Agreed, £30 is too much to spend on finding some sort of labyrinth inside a plastic tube. Patch it and carry on.☺️

An implementation of several micro-tesla valves !🤓

The same pipe on my Octavia comes off the side of the air filter housing, that had split and I simply wrapped some insulation tape around it, the engine control systems were not in the slightest bit changed when it was breathing unfitered air and when it was back to breathing filtered air.

 

The function of that damper is to smooth out the pulsations present in the induction tract, anyone who has used an old school Gunson Carb-balancer on individual chokes of a DCOE carb will recall seeing the white indicator bouncing up and down like a demon, the damper is to stop the vacuum actuators doing the same thing, its probably just filled with foam or a labrinth.