We need to get them to email you rather than text you so we can get their IPs.
They use web based SMS sending providers, don't underestimate their intelligence Romanians are well know for very elaborate internet frauds, way more advanced than the 419 crap. Many are on FBI most wanted list like this guy: http://www.fbi.gov/wanted/cyber/nicolae-popescu/view with $1 mil reward for him.
Just play the cards as you're ready to buy, ask some more details about the car, nothing advanced, like how is the paint work, any scratches, scuffs etc. Then ask them to email you the photos. They say you're ready to pay, ask for full banking details, first and last name, pretending it won't allow you to pay if you don't have full name.