clipstone

Any diagnostic on what the cause was yet?

Or have you taken my approach and just buried your head in the sand and tried to pretend it never happened

trophy

The outer stub keeps the bearings in place, you would definatly get a wobble if you drove without the front axles....

What sort of wheel weights have been used on your car? There are places around here that use beads inside the tire for balancing, centrifical force and heat keep them in place, when the tires are cold they tend to pool and throw balance off. That combined with some moisture could cause an issue.

Have you had a puncture at all? was it repaired with an aerosol patch repair?

Just some thoughts......

TomF

+1 Especially if you run the old Dunlop run-flat tires for the 959.

TomF

I would place money on tie-rods. At 80K, they very well are starting or could be nearly shot.

Putting in a new set is great way to tighten up the front end for less than $250. Money well spent, regardless of whether it cures your problem.

Just another thought, have you checked the torque on the axle nuts? The are supposed to be torqued to something huge like over 300 ft-lbs... If they get loose, or are not re-torqued properly after a c-joint service, they can cause really strange symptoms.

I had an intermittent squeak and slight shake that I couldn't diagnose a while back. It turns out that the morons that installed my suspension only torqued the axle nut on one side to 250 when they replaced a cv joint boot. (They messed up a bunch of other things, but that is a different story.)

Just a thought...

gtroth

standard stick-on wheel weights, no punctures

Yeah, certainly seems to be pointing toward the tie rods, doesn't it? Trying to decide whether to do the job myself and how far to go (shocks, etc.).
And thanks for the tip on the axle nuts. At 300 ft-lbs, I'm not even sure I know how to check that one.

TomF

Most torque wrenches don't even go much past 300, and IIRC, it is something like 330...

What we did was take it all the way to the limit of the wrench, and then grabbed a breaker bar and went a bit further by feel. It is amazing how high these nuts have to be torqued. Probably not the nuts, but if the CV boots or axles have been replaced at any time, then it would be best to eliminate the nuts as a culprit.

Hope you find a solution- let us know how it turns out.

gtroth

Little update - happened again - nice warm day, new summer tires on, so not ice, not tires.
Planning to replace tie rods.

burton

What caused the vibration? Did you notice the vibration after you hit a pothole or expansion joint? Where in CT are you?

bart1

I knew it wasn't snow... :/

gtroth

Nothing causes it, it just starts on smooth pavement at highway speed. It's ever happened after hitting any kind of bump.

burton

I had similar symptoms and it was tie rods. I drive on I-95 in CT a lot and the ruts in the center or right lanes from truck traffic caused vibrations. Any decent sized pothole on secondary roads would also do the trick.

TomF

I am not trying to sound like the poster-boy for tie-rod replacement, (at least the rubber ends) but they are a wear item and seem to be shot at between 60k- 80k. This depends on the roads, the driver and the suspension and wheel/tire setup.

I for one will be changing them out on any 993 that I own in the future at around the 60k mark. It is a cheap upgrade to get back steering feel.

Hope you get the issue sorted out.

gtroth

---inching toward replacing the tie rods (been real busy, and car's been fairly well behaved - acted up only once more a week or so ago). Started a separate thread for the remove and replace if interested:

https://rennlist.com/forums/993-foru...ml#post6584315

Cheers.

gtroth

Well, it's not the tie rods, although the new ones did keep the oscillation down do a just perceptable shimmy that would come and go. Until today - hot, some stop and go traffic, and it broke into one of its bad shakes after ~20 minutes on the rode.
Pulled over like usual, did the walk around like usual expecting to see nothing, like usual.
Guess what? Front right brake was smoking. Let it cool down for several minutes and drove off. No shimmy. Looked at it again ~10 minutes later - no smoke. ~15 minutes home. Now drive the white car for a while, I guess.

So, sticky caliper?

AOW162435

Sounds like it. That may have been your issue all along. Time for a proper caliper rebuild.


Andreas