A strange sound and accompanying vibration
Posted: Tue Jul 14, 2009 11:16 am
I have a strange sound and accompanying vibration that does not start until the truck is running at 70 km. The sound is the vibration through the body of the truck and is like vrrrrrrrrrrrrr and it is at the same time as the vibration. The vibration and sound last about 3 seconds and then no sound or vibration for maybe 1 second. This cycle repeats itself and the time line is the same as you continue to go down the road at 70km. If you speed up to 80km the vibration gets worse and you can just start to feel that the truck is trying to slow down during the vibration part of the cycle. As for the truck slowing down during the vibration part of the cycle the speedometer does not indicate that it is slowing down, it just “feels” like it.
Under 70 km the truck runs fine and has no vibration what so ever.
These speeds are as indicated by the speedometer and I have not checked the exact speed by GPS.
This is a strange request and not being in the truck when it happens makes the diagnosis next to impossible but I was hoping someone could give me a good idea of places to start looking.
Thanks in advance!
Under 70 km the truck runs fine and has no vibration what so ever.
These speeds are as indicated by the speedometer and I have not checked the exact speed by GPS.
This is a strange request and not being in the truck when it happens makes the diagnosis next to impossible but I was hoping someone could give me a good idea of places to start looking.
Thanks in advance!