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If youve gone over a service interval dosnt the ECU lower the boost down as a safety mechanism??? Mine halved the boost and had to have the ecu zapped to get it to return to its previous level!!!to say it was sluggish during this week would eb an understatement-1,4 petrols were on par!!!
 

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"That wont be required, the software on the ecu can't change itself"

It usually has a safe mode-its not a remap it is a standard feature.

Other than that a leaking pipe would seem most likely as most people seem to be suggesting.

Only thing i could possibly sugest is the injectors cloggng or the fuel pump?
 

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Well at least you can now get it sorted so thats always a good thing!!! On the brightside itll be like a completely new beast once u get it sorted-shme its winter!!! :-(

On a separate note to the post above a boost guage seems a very good idea as mine seems to have once again dropped boost even tho temps lower!!!! Il have to look into it!!!
 
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