What is this pipe on my 1.8 20v air intake?

[Izzard-UK]

Hi. Sneaking in here with a question about my 2003 Toledo because I got no response in the much quieter Toledo forum. I believe someone here should be able to help though.

I have been cleaning my air intake and noticed this short, narrow pipe which is not connected at the other end. The plastic connector looks like it has snapped off but I can't tell what is was connected to. Can anyone identify it, please? There are two photos of my actual car and then a screenshot from a video about a 1.6 engine that at least appears to have a similar pipe. It looks longer than the one on my car.... I still can't tell where it's supposed to go though!

Please help!

 

[Andrewwright]

That's part of the pcv pipework. Seems you are missing the hockey puck and its spraying oil over the intake. Either buy the hockey puck or vent to can. the car will be running rich as it has a big hole after the maf that will play silly games with the ecu. Don't think it is a hockey puck...this is the 1.8 n/a

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[Izzard-UK]

Great - thanks for the pointer! I have not heard of these terms (learning lots as I go) so I'll do some Googling. Doesn't seem too drastic and after some recent TLC the car is running beautifully. I'll definitely see if I can get this missing piece back in place though... it must have been like this for YEARS. I take it PCV is "Pressure Control Valve". I'll do some more reading. Thanks!

 

[Andrewwright]

Great - thanks for the pointer! I have not heard of these terms (learning lots as I go) so I'll do some Googling. Doesn't seem too drastic and after some recent TLC the car is running beautifully. I'll definitely see if I can get this missing piece back in place though... it must have been like this for YEARS. I take it PCV is "Pressure Control Valve". I'll do some more reading. Thanks!

Yes correct. You may want to check your pipework going to the throttle body as its probably going to be covered in oil. Also don't mess about with the throttle body and don't move the inside or you will need vcds to reset it. Clean as best you can when you replace that bit that's missing. Pcv is cheap for the 1.8t on eBay so maybe you will find the parts on there.

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[Muttley]

PCV is short for Positive Crankcase Ventilation, a system which keeps the crankcase vapours from venting to atmosphere by drawing them into the inlet system, through a valve that only allows flow in one direction. The flow rate is controlled according to engine speed.

 

[Izzard-UK]

Thanks Muttley. So far what I've read in my searching is turning up a lot of information about turbo engines and boost, which doesn't apply to me. I see a "hockey puck" part on eBay which is cheap enough but from pictures I've seen I'm not sure how it will attach to the narrow pipe I've highlighted in my photos above. It's tricky because I'm trying to replace something which I've never seen there in the first place, so I can't tell yet where it should mount. What I could really do with is a nice clear photo of what the end result should look like. It has been maddening because I can find lots of photos and videos which show the end of the pipe that I can already see (just like the screenshot at the end of my post) and NOTHING which shows the other end of the pipe which is just flapping around in my engine bay!

If it's really this valve I'm missing, shouldn't I have two loose ends of pipe?

(Incidentally I did give the throttle a good clean - that's what I was doing when I noticed this pipe that goes nowhere. I used a weight on the accelerator pedal to move the throttle plate so I could clean both sides of it thoroughly.)

 

[Muttley]

I am afraid I can't find any useful images that show the PCV system for a 1.8 engine - I'm assuming that the turbo versions are no different, as the PCV in both cases goes into the inlet system after the MAF but before the turbo system. All internal combustion engines have PCV systems in these environmentally-sensitive days, it was one of the first emission control systems implemented. The Hockey puck will be the actual valve, if I remember it right, and the small-diameter hose you've got there must be a vacuum hose to the valve for control purposes. But, I have to say, I'm guessing rather wildly now. Hopefully someone with the relevant knowledge will be along to cast some light.

 

[Izzard-UK]

I really hope so. Someone must have a similar engine.

 

[Andrewwright]

http://www.oemepc.com/audi/part_sin...g/103/subcategory/103085/part_id/801936#sec_6
Not sure but try this.

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[Izzard-UK]

Ok, interesting. That isn't quite the right diagram for mine but it has pointed me in a useful direction. Here's the air intake parts for my engine, which is engine code APG:

oemepc.com/seat/part_single/catalog/se/markt/E/modell/TO/year/2003/drive_standart/268/hg_ug/129/subcategory/129015/part_id/1396879/lang/e

Annoyingly, I can't post links until I've posted here 15 times. Anyway, that lead to me identifying this part number for the connecting pipe: 1J0129684AL

And here's an ebay listing, which shows that narrow pipe going nowhere, much like it is in my car!

ebay.de/itm/Audi-A3-8L-Seat-Leon-1M-1-8-Ansaugrohr-Ansaugschlauch-Rohr-1J0129684AL-/122595713255?nma=true&si=uBpDwdWBLjLmUMH7YfXnzjlF%252Btw%253D&orig_cvip=true&rt=nc&_trksid=p2047675.l2557

So if anyone can identify where the small pipe on part 1J0129684AL is supposed to be attached, I'd be very grateful! It seems a similar part applies to Audi A3, VW MK4 Golf and Bora
There appears to be a global conspiracy keeping this part a secret. I've watched SO MANY VIDEOS of throttle cleanings and air intake replacements and this pipe is always behind something, cropped out of the frame of the camera or the video cuts to something else just as they're about to show it!

 

[Muttley]

I think that narrow hose is more likely to be part of the vacuum system pipework, which is detailed on this rather complicated diagram.
http://www.oemepc.com/seat/part_single/catalog/se/markt/E/modell/TO/year/2003/drive_standart/268/hg_ug/133/subcategory/133022/part_id/1402684/lang/e#sec_61
Am I right in thinking that it is your throttle body that the broken bit of pipe is next to, in the first two pictures?
If so, I think the broken bit may be under the inlet manifold somewhere. You may need to try having a look with a mirror-onna-stick, a torch, and treble-jointed wrists.... But again, without actually being there to fiddle around and move bits about, it's difficult to be sure.
The pipe you've listed in your post above is the large-diameter pipe that connects to your throttle body, I think, which is visible in your photos.

 

[Andrewwright]

Seems to just connect here in these. Could just get a catch can setup, bung the hole in the intake and forget about it, check can once in a while.

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[Izzard-UK]

I think that narrow hose is more likely to be part of the vacuum system pipework, which is detailed on this rather complicated diagram.

Thanks, although that diagram stops at the throttle plate and this mystery narrow tube is off the large air intake pipe which connects to it.

Am I right in thinking that it is your throttle body that the broken bit of pipe is next to, in the first two pictures?

Yes that's correct.

The pipe you've listed in your post above is the large-diameter pipe that connects to your throttle body, I think, which is visible in your photos.

That's right. If you look at the last image (which is a still from someone's Youtube video where they've disconnected the intake from the throttle body to clean it) you can see the same narrow tube highlighted in yellow. But there's looks longer and continues in a straight line... still to a mystery location than nobody knows!

 

[Izzard-UK]

Thank you for those photos. Still tantalisingly hidden, although.... look... this also seems to have that pipe just terminating in the middle of nowhere! I've highlighted it on your photo.

imgur.com/a/6jzP0

(Sorry - you have to copy and paste that URL )

Also: glad to see I'm not the only person who gave up on those large hex bolts holding the engine cover on and just cracked the plastic and ripped it off haha!

 

[Andrewwright]

Looks to me like a bit of plastic pipe just connecting the two together

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