Can anyone give any advice on the best way to fault find low power issues with this car. At the moment I have the EGR valve blanked off but there is still a huge lack of power. Also the car seems to hit a brick wall at about 3000RPM and I have noticed a funny little halve whistle coming from the engine bay when dropping of the accelerater pedal. It will still cruise down the motorway at a healthy speed but takes an age to get there.
I have changed oil, oil filter, air filter and fuel filter just in case but no better.
I have FIAT ECU SCAN and a cable but am a bit of a noob when it comes to turbo diesels and what to look for. If it were an old petrol I'd swear the vacuum advance pipe had dropped off.
Thanks in advance.
I have changed oil, oil filter, air filter and fuel filter just in case but no better.

I have FIAT ECU SCAN and a cable but am a bit of a noob when it comes to turbo diesels and what to look for. If it were an old petrol I'd swear the vacuum advance pipe had dropped off.
Thanks in advance.