In my 2005 Toyota Previa D4D T3 (2.0 litre diesel), the turbo had blown just over a year ago. I took it to garage who replaced the turbo and, generally, the car has been running fine except for one issue.
There's a noticeable lack of power at lower RPM and a noticeable hesitation trying to accelerate. Once it gets to about 2,000 RPM, I can feel the turbo kick in and the acceleration picks up quickly, yet at lower RPM it feels sluggish. Pushing the accelerator all the way to the floor at lower RPM would make no difference.
I had two other unrelated people (including one mechanic) test-drive the car and comment on the same observation, so it's not just me.
I have taken the car back to the garage twice - but they stated that they couldn't find anything wrong with it and that it's just a large car with a not-so-large engine. Yet, it definitely feels more sluggish than it was before the turbo replacement.
There are no warning lights and there are no fault codes stored (checked with a simple hand-held tester). What can be the cause of this?