Whats the best way of checking the map on a cdti 150??

[richiem]

Hi

I have a cdti 150 that has been remapped in the past by a prevoius owner and im interested in knowing if theres a method i can use to check what was done to it.. All i know from the seller is the guy before him changed the set up with a laptop!!
The reason i want to check it is the car runs ok but gives pretty poor mpg even if driven very sensibly.. Also on the last mot the tech said he believed it was running really rich as he had to blast it out to clear the black soot from the exhaust. My prevoius motor was a 300bhp cali and that still gave factory milage when cruising altho it was highly modded so im thinking it could of been done wrong or something
On a long run im getting 38-40 mgp driving at 70 which isnt that good seeing as the fuel computer is showing 50-55 mpg.
Any ideas would be very welcome.

Not sure if this is useful info or not but the car has no egr valve set up connected as its all been removed and blocked out with covers..