Intermittent Shimmy ??

[maytag]

Loose steering gear?
Bad ball joint?
Bad tie rod?
Bad wheel bearing?

I'd be checking front end parts, is what I'm saying.

The other possibility: does this occur at the same place each time? (I have a specific spot in my commute where the grooves in the paving cause a front end shake)

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[BoxMann]

Originally Posted by maytag

Loose steering gear?
Bad ball joint?
Bad tie rod?
Bad wheel bearing?

I'd be checking front end parts, is what I'm saying.

The other possibility: does this occur at the same place each time? (I have a specific spot in my commute where the grooves in the paving cause a front end shake)

I understand that those worn parts could cause a shimmy, but why would it happen intermittently? Wouldn't it happen consistently? And the shop (and PPI) inspected all of that and said everything looks good. And the car was aligned very recently. Those problems would have shown up on an alignment.

And it occurs on different roads.

[maytag]

Originally Posted by BoxMann

I understand that those worn parts could cause a shimmy, but why would it happen intermittently? Wouldn't it happen consistently? And the shop (and PPI) inspected all of that and said everything looks good. And the car was aligned very recently. Those problems would have shown up on an alignment.

And it occurs on different roads.

Intermittent is certainly plausible. As a part wears, particularly parts that affect steering / alignment, they will respond unpredictably to any input which changes the balance of the car: throttle input, braking, steering input, camber in the road, bumps, etc etc. Intermittent is certainly plausible.

And to your comment below:

Originally Posted by BoxMann

.....This is a top notch Porsche shop, not Midas Muffler.

I'd wonder how "Top Notch" they can really be, if they sent you on down the road with an "intermittent shimmy" that they can't diagnose?