just a day or so ago we started hearing a sound when we were going down the road that sounded like a motorcycle was behind us. a cheap motorcyle at that. but it was coming from our car. Seems you don' really hear it when you are sitting and idling or when you first start out, but once it hits 40 mph, you start to hear it. it's a definite noise that i can only compare to a motorcycle noise or vibration. the engine shifts through the gears well and there are no engine lights on, all vents are turned off so I know it's not the air condition or heat. so i'm not sure what is causing this noise. this is a 2006 PT cruiser. we surpassed the warranty about 1600 miles ago plus and are at 37,700 give or take a few. any clues to what this might be or where we should look? also we notice a lot of black dust quite often on the front rims of the tires. is that common for most? thanks for any input.

 

if u can make a recording of the noise that might help a noise can be anything to a tech we hear some stuff that u dont and u hear some stuff that we jear all the time u get my point?
If u cant post it on here email it to me kkeller608@aol.com