[RolandMS]

Hello everyone,
I just recently purchased a 2007 X3 and I have a slight vibration issue that starts an about 45-50mph that gets slightly more pronounced when I let off the throttle. I was told by the previous owner that he had replaced the rear drive shaft and half axels. I replaced the front struts and drive shaft plus I have changed the oil, oil filter and air filter I also changed out the spark plugs and one of the spark coils since I was getting a cylinder misfire on number two cylinder. And since the transmission was showing signs of slipping and acting like a beginning driver starting out in the wrong gear I did a fluid change and boy did it need it it was a brownish red color and looked like it had never been changed the car has 158k miles. All those transmission issues went away and shifts smoothly. The magnet had just a little bit of normal gunk on it but the pan was very clean. I plan on changing the brake pads both front and back in a couple of weeks.
So back to the vibration issue, has anyone encountered this issue before and what was the solution? I can describe it as not like a drive shaft or wheel wobble but a steady interval that increases as you go faster and slightly more pronounced when you let off the gas. I have been doing my own mechanical work since I was first licensed in 1969 my dad was a aircraft mechanic for 27 years in the Navy and he had me working on cars with him since I was 8 years old. This problem has me stumped.

[Richneerd]

Originally Posted by RolandMS

Hello everyone,
I just recently purchased a 2007 X3 and I have a slight vibration issue that starts an about 45-50mph that gets slightly more pronounced when I let off the throttle. I was told by the previous owner that he had replaced the rear drive shaft and half axels. I replaced the front struts and drive shaft plus I have changed the oil, oil filter and air filter I also changed out the spark plugs and one of the spark coils since I was getting a cylinder misfire on number two cylinder. And since the transmission was showing signs of slipping and acting like a beginning driver starting out in the wrong gear I did a fluid change and boy did it need it it was a brownish red color and looked like it had never been changed the car has 158k miles. All those transmission issues went away and shifts smoothly. The magnet had just a little bit of normal gunk on it but the pan was very clean. I plan on changing the brake pads both front and back in a couple of weeks.
So back to the vibration issue, has anyone encountered this issue before and what was the solution? I can describe it as not like a drive shaft or wheel wobble but a steady interval that increases as you go faster and slightly more pronounced when you let off the gas. I have been doing my own mechanical work since I was first licensed in 1969 my dad was a aircraft mechanic for 27 years in the Navy and he had me working on cars with him since I was 8 years old. This problem has me stumped.

wheels, tires, suspension, steering wheel, look into those

[SEPPY]

A trailing arm bushing potentially.