My '97 Megane Scenic with the 1.9 tdi engine feels very tired at low revvs. Taking of at lights or going uphill at low to medium speed is somewhat of a problem sometimes. However, at 1750 rpm the engine suddenly kicks in, and everything is fine. Highway driving is ok, mpg rating normal and there is no abnormal smoke. A subtle, but audible, whistle from the turbo indicates that it's working properly at part of the register at least. Is this normal, or do I have a boost pressure problem? It's my first diesel, so I don't really know what to expect. 1750 rpm is admittedly a low speed, but the car is highly geared and it feels like the torque is needed already before this speed.
Thanks,
Daniel