well code 252 is very uncommon, all i can think of is that maybe you have a problem with one of the hoses as opposed to the possible problem with the purge valve. if there is a problem with the purge valve than it could be that its stuck short or open, restricting flow but still working. im sorry i cant help you any further because i havent really tackled anything like that yet however i have has some purge valve experience with e30's.
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