Mystery pipe (not BX sorry!)

[Philip Chidlow]

Hi I'm hoping someone here can help me: I had the cam belt changed on the Peugeot 806 and apart from finding a bolt loose on the top of the rocker cover (which I've now tightened) everything else seems fine. Except for one thing: there's a pipe of which one end doesn't seem to have a home. When the engine's running there is vacuum if you put your thumb over the end of it...

The attached pics (the pipe isn't green I just highlighted it!) might be sufficient for someone to tell me what it is and where it should go. It's the PSA 1.9 turbo diesel (XUD9TF I think). I have noticed it's now not so easy to start (although it always does) which could be connected (maybe there's air getting in?). Any help or advice gratefully received, chaps.

[ghaddon1701]

Hi,
Is there a pipe going into your boost compensator(the thing on top of your injection pump). Visible in your first picture?

Regards Graham

[Philip Chidlow]

Is that the black box with two brassy nuts on top? If so, there is a small pipe connected to it.

[mat_fenwick]

Is that the black box with two brassy nuts on top? If so, there is a small pipe connected to it.

No, it's the union across the top of the inj. pump from the black box, next to the plastic air pipe. Looks to be connected to something though. Is performance the same?
Sorry I don't know, but if you've paid to have the job carried out I'd pop back and ask them where it goes.

If there is a vacuum then extra (unfiltered) air will be getting in, so I'd plug it for now. It may be for something that uses a switched source of engine vacuum (I notice it goes to something with an electrical connection).

[electrokid]

It's just possible that is a vacuum operated coolant valve on a pipe feeding the heater matrix. Check to see if the heater works - then block the end of the 'green' pipe and check to see if the heater still works (or starts to work if it wasn't before).

If that process changes the heater operation then look for where the pipe was connected - it will be routed through to the heater switch on the dash.

But the best suggestion was to take it back and ask them to re-fit the pipe properly.

[electrokid]

Nah - that's rubbish - more likely attaches to the carb to weaken the mixture when the throttle is fully closed.

If you get someone to put their foot on and off the accelerator while you feel the electrical widjet at the end of the green pipe you may be able to feel it click - but then you'll need to know where to connect it on the carb - so probably back to the garage again.

[Philip Chidlow]

I'm off to the local Peugeot service dept. tomorrow as my local garage haven't got a clue where it goes!!!

[barry badger]

I can only think of two vacuum controlled items on this type of engine at the moment:- the turbo wastegate actuator and the egr valve (if it's got one), both of which are located at the back of the engine. If the wastegate isn't connected the engine will be totally gutless, if the egr valve isn't connected i'm not sure you'd feel any difference.

[RxBX]

...........
It's the PSA 1.9 turbo diesel (XUD9TF I think). I have noticed it's now not so easy to start (although it always does) which could be connected (maybe there's air getting in?). Any help or advice gratefully received, chaps.
.................

Nah - that's rubbish - more likely attaches to the carb to weaken the mixture when the throttle is fully closed.

If you get someone to put their foot on and off the accelerator while you feel the electrical widjet at the end of the green pipe you may be able to feel it click - but then you'll need to know where to connect it on the carb - so probably back to the garage again.

Its a Diesel engine



.

[citronut]

Nah - that's rubbish - more likely attaches to the carb to weaken the mixture when the throttle is fully closed.

ooo er missus i aint sin a diesel with a catb before

If you get someone to put their foot on and off the accelerator while you feel the electrical widjet at the end of the green pipe you may be able to feel it click - but then you'll need to know where to connect it on the carb - so probably back to the garage again.

the electrical device at the end of the green pipe will be vacuum operated, not sure exactly what it does, the other end will go to the induction at some point,

Phill
ask the same question over on the FCF as there is a lot of very knowledgeable XANT folck there, im sure you will get the correct answer there, plus a load of silly ones

regards malcolm

[electrokid]

Its a Diesel engine

ooo er missus i aint sin a diesel with a catb before

It won't be connected to the carb then will it

I'm obviously confused here - would someone remind me which planet this is

[Gibbo2286]

This any help? This is a Xantia pic, No 5 is a 2 way union, I'd say on the Peugeot there'd be a pipe from there to the brake servo and one to the EGR as shown, Xantia of course doesn't have a brake servo.

[citronut]

Its a Diesel engine

ooo er missus i aint sin a diesel with a catb before

It won't be connected to the carb then will it

I'm obviously confused here - would someone remind me which planet this is

we'll just put it down to a senior moment Brian

i have them all the time


regards malcolm

[electrokid]

Definitely a senior moment - going on the above I reckon my 130th birthday isn't far off