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[Sir Tigger KC]

Hmmm! Starting to find my way around a Peugeot 2ltr HDi... 

What I'd assumed to be the fuel filter housing was in fact the oil filter housing  and when I took off the engine cover, there is the fuel filter housing! Both look as if they have been disturbed! 

There is abit of kit underneath the alternator with some red plastic housing, that has 2 vac pips coming from it, but it looks as if there should be 4 as there are 2 vac pipe 'terminals' with no vac pipes on the left side.

Is the big boost hose the one that goes from a small radiator (Intercooler?) to to inlet manifold and looks like a very large coolant pipe?? If so it looks OK and feels squidgy so I popped it off at the rad end and there was some oil residue in there.......

Might this be a turbo issue then?? 

[ngrainqey]

sod 12500 miles between services :/ 10k if that if it were mine lol

[ngrainqey]

how squidgy is the squidgy boost pipe? sometimes they can collapse so block airflow

[Sir Tigger KC]

Very squidgy! but it's still in shape if you know what I mean? 

[Sir Tigger KC]

I've been checking out some of the Peugeot forums and it seems that collapsing turbo pipes isn't unheard of......

I took it for a run yesterday and driving around town its fine, but it loses power when driven hard or up a steep hill. 

I'm going to have a look round the local scrappys today and see if I can find the pipes.  Otherwise I've seen a universal turbo pipe on ebay for about £15 that might be worth a try...... 

[hoody]

The issues you describe perfectly match the issues i had with the expert,the pipe i was referring you to is the map sensor pipe

http://www.ebay.co.uk/itm/407-Map-Sensor-2-0-Hdi-Manifold-Air-Pressure-2-0-Hdi-138hp-1-6-Hdi-20CZ-/400278665790?pt=UK_CarsParts_Vehicles_CarParts_SM&hash=item5d3277ba3e

the pipe attaches to the nipple underneath,not really obvious on the car but the pipe can come adrift or rub against something and hole the side of it(only takes a pinhole).

[hoody]

sits next to intercooler pipe next to airbox/battery on a 407(so i am told)

[Sir Tigger KC]

Brilliant! Thanks Hoody!    I think I'll pull the battery out tomorrow, maybe it'll be more obvious... 

[hoody]

This is a 406 clip but may be the same,

http://www.youtube.com/watch?v=LWER2TfOhkY


the map is the part shown at 4.06,only has a small hose by the looks of it

[Sir Tigger KC]

Thanks again Hoody!  I know what I'm looking for now!! Cheers!! 

[Sir Tigger KC]

Found it!! 

It's sited in a housing with a butterfly valve (throttle body?), that has the turbo boost pipe going in one side then it's bolted to the inlet manifold.  There's no pipe it's just bolted on to the valve housing. I've stripped it all down and everything was caked in oil, so everything has had a good clean.  There's another sensor bolted to this housing which has a delicate looking filament loop with what looks like a diode in it, and that was caked in crud and oil, nice and clean now!! 

I'm going out now to put it all back together and keep everything crossed!!!! 

[Sir Tigger KC]

Alas!! No difference!! 

It must be an electronic issue tho, as it's fine from start up and then after a few minutes the turbo will stop working......    Although there's no messages on the screen and the EML goes out, I might take it somewhere to plug it in to see if there are any codes... 

Thanks again for your help Hoody!! 

[hoody]

try cleaning the air temperature sensor too,been told it is the "green one" next to the map.

[Sir Tigger KC]

I think that's the other one that I cleaned yesterday Hoody... 

I've had a good look round the Peugeot forum and it might be an issue with the Diesel Particulate Filter being blocked? Apparently they need a good run now and again to blow them out or "regenerate"? Or failing that taking off and cleaning.... 

I'm going to try an Italian tune up the motorway this afternoon!! 

[Sir Tigger KC]

Quick update....

I eventually admitted defeat and booked it in with a local independant peugeot specialist.  They plugged it into their Peugeot Planet system and told me it needed a new MAF sensor, air temperature sensor, and turbo solenoid (the one that works the waste gate) and it would come to £400 as the turbo is tucked away at the back of the engine and changing the solenoid is time consuming.... 

So I reluctantly gave the go ahead and they phoned the next day to say that they had done the work but the turbo was still cutting out and there is a vacuum issue, which they'll look into.   

Now I'm wondering if it was the vacuum issue causing the solenoid not to work in the first place, and they've just changed parts that came up on the code reader rather than some good old fashioned mechanicing....