Yeah,

I'd start by checking all the small bore black piping to/from the turbo boost prerssure solenoid.

and check the vac pipe from the vac pump,

Could be there's a leak there limiting the vac pressure until higher engine speed.

There's varients on these so for accuracy I'm going to need the code from the middle of the VIN number,

RHY,RHZ or whatever it reads.

Is the wiring to the MAF ok? Can Planet see and query the sensor readings from it?

Still waiting for the rhy,or whatever it is code.

Ah progress,

Try swapping from your spares car the Manifold Abolute Pressure Sensor to your problem car/

I'll be honest it's been so long I can't remeber!

It's certainly in the induction system,

little black doodad with a three wire multi plug connector and held in with a single fastener,

remove same and wiggle loose,

When free there's a cage afair over the sensor element itself.

If this is the part you've already swapped then report and we can move on.

Can't you get hold of Peugeot Planet diagnostics?

A full scan and data read would clear this up.

The plot thickens!

I'm taking it that the EML does come on with key on engine off?

The plot thickens. I have just done what I should have done in the first place and removed the engine cover and shone a light down the back, the outcome was that the vacuum hose to the turbo wasn't connected to anything! I had difficulty in seeing it originally as it was underneath the other hoses.

I looked for where it should be connected and couldn't find anything, I then looked at both the other cars and found it should be connected to the uper connection of the solenoid in the centre of the bulkhead but on mine it had a rubber cap over it. I took the cap off and checked for vacuum, there was some but it didn't feel very strong, I checked the other hoses and couldnt find any leaks.

I drove the car a mile or so with the pipe connected but didn't notice a lot of difference altthough the engine was cold. I shall be doing a couple of hundred miles in it this afternoon so will be able to tell better. If vacuum is from the same source as the brake servo this would explain why the brakes have never been all that good on this car but the other one nearly puts you through the windscreen. Could it be a faulty vacuum pump do you think?

I have had the car a couple of years and done about 20k miles and its always been OK so why the power had dropped off now is a mystery but somebody has obviously got at it before I had it.

Edited by Peter.N. on 30/10/2017 at 12:30

I will just check that the solenoid is not faulty if not I will do that. I have been to Surrey and back this afternoon 200+ miles and there is a slight improvement since I connected the turbo pipe, it starts to pull about at about 1700-1800 rpm where as before it was about 2000 rpm.