hi i have a 1600cc 8 valve petrol akl engine golf.the car runs great until it gets hot and try to do an mot emissions test with throttle at 2500rpm.then it white smokes so much the test has to be aborted.it is not using any water wotsoever, so could it be an emmissions issue cos the printout for emmisions are sky high.no codes read either.the fuel has been drained and replaced.new filters,plugs etc etc.any ideas and i will be very grateful thankyou for reading.vinny