I've got a 1995 E320 with a loose ignition switch. If I put the key in partially, I can turn the switch 180 degrees. Nothing engages nor does the car start when I do this. If I push the key in completely at this point, it won't turn any further. However, if I turn it back 180 degrees to its normal position by pulling out the key partially and then inserting the key fully, it works normally. Any ideas as to why this is happening?