I would like to lean out my fuel mixture. PO replaced AFM from a 1987 735, checked BMW part numbers and same piece for both cars. I have a small cylinder under the afm, but I don't think this is the screw everyone speaks of. I have a black cover that says "BOSCH" on it and it seems to be glued on. Is the udjustment screw under this cover? Also, about how many turns recommended and to which way?