C5 tube loose

reacher · Unread post by **reacher** » 04 Oct 2009, 17:31

Regarding my C5 (2005 model) 1.6 HDI. There is a small diameter (about 5mm) plastic tube or pipe that runs from under air filter/ air mass sensor area and ends near the turbo ish, its loose and I dont know where it should go ! It is also melted and sealed 6 inches from its end so needs repairing. It must have some purpose! The car runs fine but I often think it lacks power sometimes. Any ideas ?

KevMayer · Unread post by **KevMayer** » 04 Oct 2009, 22:40

I've had a look on the Citroen Service info I have and your turbo looks like a typical Garrett unit with a diaphragm actuator. The picture I can see shows an electrical connection on the actuator with a small diameter stub pipe coming off it. The loose pipe you see may fit onto this stub pipe on the turbo actuator. It might be something like a pressure return pipe back to the air filter housing.

This is just a guess, so, see if you can check the turbo actuator and see this small stub pipe.

citronut · Unread post by **citronut** » 05 Oct 2009, 08:31

kev isn't the stub/pipe you talk about the vaccum pipe that opperats the actuator,

regards malcolm

reacher · Unread post by **reacher** » 05 Oct 2009, 19:51

Thanks Kevmayer, I will check it out though have looked in that area but will have a closer look.

reacher · Unread post by **reacher** » 05 Oct 2009, 19:54

Thanks for your input citronut.

KevMayer · Unread post by **KevMayer** » 05 Oct 2009, 20:13

Hello Reacher & Citronut,

I'm not sure what pipe it is. Just guessing really.

Your theory that it could be the vacuum pipe sounds good. If that pipe isn't connected then I'm not sure what effect that would have on the boost pressure.

On my 2.2 Hdi, if the vacuum pipe to the turbo actuator fell off I'd get an over boost which would bring up the dreaded Anti Pollution warning.

reacher · Unread post by **reacher** » 06 Oct 2009, 19:02

Thanks Kevmayer, the pipe does run in the general direction of the vacuum pump but I cant follow it far enough to trace it. Some positive leads here thanks.

reacher · Unread post by **reacher** » 18 Oct 2009, 13:17

Have looked at the stubb pipe on the gate valve on the turbo but it has its rubber tube connected and seems ok, cant see where my loose plastic pipe can go. Its a mystery! My loose pipe has a mesh shroud around it to shield it from heat where it passes close to the engine although it has melted further along. Have looked at Haynes but its no help.

citronel · Unread post by **citronel** » 18 Oct 2009, 18:37

if you can post picture from your car I can identify the tube on my car and give you the right answer.

Until then I attached the diagram about turbo vacuum pipe, maybe you can identify yourself. 99% it is one of this.

there is one tube that go from vacuum pump also...

reacher · Unread post by **reacher** » 19 Oct 2009, 17:25

Thank you very much Citronel, your picture is very usefull. I will know what to look for now, if I am still no wiser I might take a photo and post it on here. Thanks again.

Reacher.

reacher · Unread post by **reacher** » 20 Oct 2009, 16:29

Thanks Citronel, from the diagram you posted I think that my loose pipe is from the turbo. I had a new turbo fitted a few months ago and I think they replaced the vacuum pipe as its damaged but they just left the old pipe hanging around to confuse me. The replacement pipe is of a rubber type but seems to take the same route as the old plastic one. Thanks again to Citronel.

Reacher