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hi guys
i have a 88 bhp 2.5 TDI and the van runs fine when cold but when it is at normal running temperature it will accelerate up to 85 mph then when i come to a hill it will drop down and wont go above 50mph. This is my second van with this engine and my last one didnt suffer with this problem. Please can anyone help me??:confused:
 

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First things first.
Check all the rubber hoses on the engine, in particular the one that goes onto the wastegate on top of the turbo. Mine had come off & did exactly what you are describing. Can you hear the turbo spinning up?
 

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had similar problem with mine, but mine only got up to 70mph max and as low as 30mph on hills. First thing i tried was unpluging the MAF sensor on the air box. The differernce was unreal. So i popped to vw and bought a new sensor for around £70 (only buy vw part)
and now running perfect. Hope this helps:)
 
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