My 87 300td runs a lot better at lower altitude ,we live at 8200 feet and it smokes a lot in the morning and also runs hotter than I would like to see.Also it runs rough when it is first started cold.My wife recently drove the car to Ohio and it ran cooler at lower altitude and did not smoke as much in the morning.I was wondering if anyone knows about this altitude adjuster and if it might be my problem.Thanks Mike