This is an interesting question, as he mention it happening when it immediately 
following going over some sort of bump in a driveway... I dismissed this, 
thinking that since everything the belt drives is attached to the engine in 
some fashion it wouldn't affect the belt.

Could I be wrong?

Dan

On Dec 3, 2012, at 1:13 PM, Tim C <bb...@crone.us> wrote:

> On Dec 3, 2012 11:43 AM, "Dan Penoff" <d...@penoff.com> wrote:
>> 
>> Everything appears to be tight and lined up. No slop in any of the
> pulleys that I could find.
> 
> Total guess, but bad engine mounts leading to shake at idle?  Or, does son
> usually drive with windows down in summer?  Might the compressor pulley be
> shaking slightly under load?
> 
> Best,
> Tim
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