I finally found the pcv valve on my 90 b12 but I can't get the darn thing off!!! It is screwed on incredibly tight. Does anyone know any tricks to try and loosen it off? Would letting the engine run for a bit to warm it up help? I've heard that helps with o2 sensors if they're stuck. The only thing else I can think of is taking it to a mechanic...but i can't bear spending the money on a free job.