Just some VERY wild guesses:
I would pull the rear wheel? and look for rust buildup on the
rotor or pads. How old are the pads? Check the emergency brake
cables to see if they are sticking.
The 2 Hz vibration "could" be the natural frequency of the rear
spring and the mass of the rear tire and wheel. If that is what is
vibrating, then your shock absorber is bad or the shock mounts
could be bad.? The shock absorber should damp out that vibration.
How old are your shocks? Original? Mine lasted for <100kmiles.
Sam
02 EVC 145,000 miles
On 8/17/2022 5:51 PM, James Loomis via
groups.io wrote:
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I have 2 strange noises coming from my 2002 EVC.? The first noise
is a low grating noise that appears to be coming from the right
rear.? I initially thought it was wheel bearing related, but my
mechanic found no wheel bearing issues.? The noise is most
apparent when first driving the van after it has been parked for a
while with the emergency brake applied but is noticeable while
driving.? The right rear wheel turns silently and freely by hand.
The second noise is a low rumbling while driving at speed (65 to
70 mph) with a frequency of about 2 cycles per second.? The noise
appears to come from the rear of the van, but it is difficult to
determine the actual location while driving.
Neither of these noises appears to affect the operation of the van
or appears to be engine/transmission related.? The rumbling noise
frequency is not consistent with the wheel rotation frequency and
there are no moving parts back there except the wheels.? I am
stumped and would appreciate any recommendations or observations.
Jim Loomis
2002 EVC, 150,000 miles
