Secondary Air Pump
I had a trawl through the forum to see if anyone had experienced the same problem I'd been having and found very little, so I thought I'd share my findings which may benefit someone else in future.
A while ago my car developed a "noise" which was more of a whine. As I'd previously driven it home when the power steering system blew a hose I assumed it was the pump on it's way out as it's fatal to run them dry. Recently the noise got a lot worse and became more distinctive and I pinpointed it to being during start-up and ceased once the revs died off. Onto the forum I go, D3 tech dump (thanks, again, Del +++) searching through the manuals and service information and discover the secondary air pump, whose failure suited the symptoms of what I was experiencing. Spoke to Prestige, bought a second hand one for £40, delivered next day (compliment in associated thread :) ) I had it fitted on Wednesday by my ever reliable mechanic, £30 charge, car now sounds like it should again. He confirmed the pump damage was internal, seemed like the pump vanes were damaged and it had become unbalanced, causing the noise. He also confirmed it looks like the same pump that's fitted to VW Polo 1.4 variants etc so it may be worth checking compatibility should anyone need one for an 8 and Prestige don't have one. So, back on the road again, at least until the next mechanical episode... |
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Found in the following: Audi: A3,A4,A6,A8,Q7,TT VW: Beetle,Caddy,Golf,Jetta,Passat,Polo,Sharan,Touran, Touareg Seat: Alhambra,Altea,Cordoba,Exeo,Ibiza,Leon,Toledo Skoda: Fabia,Octavia,Superb |
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EDIT: Forgot to say, the D2 one only has one pipe connected to it, whereas the D3 has two, so doubt they could be 'made' to work. |
What is this secondary air pump for, what does it do?
I have a slight whine on mine, that I've always put down to the PAS reservoir being so hidden as to not get checked during regular services. (I make certain that they check it, but the former owner will not have). Perhaps this is the thing that's causing it. D3 S8 |
It's all to do with pollution control, by injecting air into the exhaust. Fairly complex as it works differently as the engine & catalyst warm up. See: https://en.wikipedia.org/wiki/Secondary_air_injection
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Get it replaced before it gets worse, it's not an expensive job +++ |
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Also, the amount of swearing it evokes when trying to get to anything on the back of the engine (which is all blocked by said pointless junk) probably contributes more to global warming than warming the cats up 60 seconds early ever saved :ROFL: Its another case of manufacturers making something to pass the test, rather than making any useful contribution to real-world emissions. |
Will the cats be ok during that phase?
I thought the ecu chucks extra fuel through and the air pumps in the air to get the cats up to temp quicker. Without air surely the extra fuel would be bad for the cat??? |
Thanks for the explanation folks. Enquiry now waiting with Prestige for when they open their inbox.
Car is in for its annual service soon, so a perfect time to get this investigated. |
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