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Peugeot 207 HDI 1.4 2010 model (without FAP)

The above car is excellent apart from a very slow pick up below 2000 rpm, particularly noticeable in 1st and 2nd gears. It seems to wait 2, 3, and sometimes 4 seconds, before it suddenly races forward, when the revs get above 2000 rpm.

I would have thought this would be related to turbo problem issues, but would appreciate suggestions from anyone who may have had a similar problem and found a solution.

The car does 53 miles / gallon (which is great), and this is driving in towns and cities, so possibly there is a considerable carbon build up in the EGR valve and other places.
However even racing the engine (once fully warmed up) down the motorway to clear the carbon deposits, does not resolve the problem of sluggishness under 2000 rpm. The turbo lag seems too long to be working correctly.

There are no engine fault warning lights, and the exhaust emissions are "clean" (no black smoke).

Thank you
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