All so the car won't produce any boost at all

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I think, just maybe the problems are linked...

probably limp mode, or fudged turbo. what codes have you for us?

-1 means at least your vac systems ok.

Haven't had time to plug it in yet will do tomoro and post up what I find

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Have you plumbed it into the vacuum box or the top plastic boost pipe? If youve gone for the pipes of the vacuum box then thats why its reading negative.

I have gone of a egr delete pipe it came with a nipple for the boost gauge pipe to go on mate

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If you rev the engine do the pipes swell a little?

Scanned car and to fault codes one is p0327 and p0113

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knock sensor

and poss maf sensor

Knock sensor? Not on a diesel

ah yes, i was just going by the fault code list. oops

Well I have changed the map sensor and still doing it I am going changed the coolant temp sensor tomoro see if that makes a difference part from that I don't know what do

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Id check the wiring to the map sensor myself, p0237 is MAP sensor circuit A iirc and youll probably find the wiring broken or damaged if its been stretched to fit.

Id check the wiring to the map sensor myself, p0237 is MAP sensor circuit A iirc and youll probably find the wiring broken or damaged if its been stretched to fit.

This is the fault code I had - I've extended the wiring loom on mine. That was the cause of the fault on my car.

What do you mean by wiring loom do u mean the wires to the map sensor mate

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Yes

this is where in went wrong he had written p0327 not p0237

thats why i said knock sensor

Yeah I looked it up, thought they don't have one and wondered if he meant 0237.

It's all guesswork anyhow but sounds fairly likely.

Sorry guys got one code wrong its p0237

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Right guys I can get it stop dropping in vacuum by turning boost up on actuator but it boost to 0.5 bar just revving it slightly on tick over then will boost past 2bar but if u turn the boost down a little it goes in vacuum again

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Is your actuator broken then? Is it working with vac? If you can make it boost bu hand

Yeah can make it boost but it boost hard so turn it down on actuator and it goes in vac to just under -1 then won't boost at all

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on idle its supposed to be in vacuum a little bit. Cant figure out why i t wont boost if adjusted correctly, unless map sensor need replaced

That wouldn't cause the fault code.

And the VNT actuator is a precisely set up bit of equipment, it's not supposed to be messed with, it's not a wastegate.