I have a weird smell comming from the engine. I have never smelled this before, but if i had to describe it i would say it smelled like wet clothes burning. Its hard to describe, but i can only smell it when i open my windows and i feel the hot air from the motor. i have no smoke comming off the engine, and i ran it today at idle for 15 minutes to make sure it didn't overheat and it was fine. any suggestions? its a 97 540I with 132K, auto.