Wow. I know these things are too expensive for what they seem to do. I do not see any leaking around the EHA. My car is a '91 300E. My Daughter's is an 87 300E. Maybe the earlier parts were built better? I can swap it out with hers and see what happens. Also, a while back I adjusted it clockwise and it seemed to help the starts but I adjusted it back a little for some reason. Maybe it's just out of adjustment now? I read somewhere that depending on the car, these are adjusted counter clockwise either 5 1/2 turns from closed or 6 1/2 turns from closed. Anyone hear of this before? Can these units actually be tested locally? I currently am getting +20mpg highway with new injectors.