Help! vibrations under load 80 kph and above ?
#1
Help! vibrations under load 80 kph and above ?
I searched and could not find anything specific to this, sorry I really tried before posting. 2002 Excursion 7.3, stock everything including tire size. New balanced tires in Nov 10, unloaded, no trailer.
When I hit about 80 kph I get a vibration like shuddering growl (best i could think of to describe) this happens only under throttle, if I let off or feather the pedal it completely stops. It gets worse / louder as the speeds increase however when I let off the pedal at higher speeds like 120 kph it still goes away. It sounds like it is coming from the motor. It rolls smooth as can be and gets worse the more the pedal is pushed.
None of these sounds / vibrations happen under 80 kph even under WOT.
I'm stumped and don't know where to start. Any help on what and how to check would be greatly appreciated, Thanks
When I hit about 80 kph I get a vibration like shuddering growl (best i could think of to describe) this happens only under throttle, if I let off or feather the pedal it completely stops. It gets worse / louder as the speeds increase however when I let off the pedal at higher speeds like 120 kph it still goes away. It sounds like it is coming from the motor. It rolls smooth as can be and gets worse the more the pedal is pushed.
None of these sounds / vibrations happen under 80 kph even under WOT.
I'm stumped and don't know where to start. Any help on what and how to check would be greatly appreciated, Thanks
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