Quote Originally Posted by FuNkYcHiCkEn View Post
Thanks For the advice Steve.

I always thought that the car was extremely slow before I fitted the box, so like you said, there could be an underlying problem...

I have tried adjusting the screw on the box, but it dosen't make a difference to the problem, which either way I turn it!!!

Bearing in mind the car has done such a low mileage, would the MAF really be playing up??

Anyway, I know someone who has access to a VAGCOM system, so I will get the car checked over. Does the MAF always show up if there is a fault, or is it something that does not always show up...
A faulty MAF does not allways show up as defective when scanned ! The right way to see if the MAF is faulty is to do a log in third gear while you floor the car over 3000 rpm and then you compare the requested airflow with the delivered airflow and see the log file on a spreadsheet in EXCEL. The req air and metered/delivered air should be closelly following each other. Another way to see if its faulty, do a log as described and then disconect the MAF plug and do another log. If they are identical, then the MAF is shot. Another way to test-but not that accurate-is disconect the MAF and take it for a ride, if it improves or there's no change, replace the MAF. Remember that disconecting the MAF will trip a fault code that will need to be reset. If you planning to keep the tunning box, i suggest you follow the supplied instructions closelly and also you should disconect the battery to initiate basic settings again. See if you have the radio code as you may need it after reconecting the battery. Hope this helps.