I have an automatic 2001 Grand Am SE Coupe with just under 90k miles on it. I've noticed recently (since 85k) that whenever the car is idling in drive, it vibrates. This isn't normal engine vibration either, there's something going on and I can't figure it out. Here's what I've found so far:
- the car only vibrates when idling in drive, no other gear.
- vibrations disappear when the car is put into park or neutral
- the vibrations do not start until the car has reached its operating temperature, which is about 180-200 degrees
- the vibrations to not change when the air conditioning is turned on or off.
If anyone's experienced this kind of issue with their car or has any insight as to what might be causing it, I would greatly appreciate it. I've asked a pontiac technician of over 10 years over the phone and he's stumped.