okay thanks for telling me the vehicle (why would i look in your profile you may have more than 1 car ). i have a 1990 Audi 100 quattro. Does the same exact thing. unplug the differential pressure regulator on the cis unit and see if that works(start it up and then unplug it). This is the only way to make mine run as i don’t feel like investing time in such a large pile of you-know-what. i’ll find a pic of said DPR and host it up here…
