Front Suspension Hopping after bump in the road??

[Joelaron]

Here's a wild one.. there's a little bump where two parts of the highway onramp meet in the Marina in San Francisco, northbound. I hit it every day. Yesterday, I stayed on the accelerator over the bump to pass a car and after the front wheels were on the bump, the front of the car start hopping as if it was a reverberation of the suspension that kept the wheels bouncing. Got off the 'gas' immediately and it stopped. Not making this up. So today, I did it again.. and it did it again.. but this time I kept accelerating to see it if would resolve itself... it did not, and I was 100% unable to turn the car as the bouncing increased with acceleration.. i had to pull over on the highway to let the car settle. Anyone else have this happen? Some crazy stuff going on.. and wonder if it's the 'knock' in my steering wheel that i keep feeling on acceleration at low speeds. (that I mentioned earlier in another post)

anyone?

 

[FathomBlueStealt]

I've had the same exact thing, it almost felt like the feeling when ABS braking kicks in, and yes it feels like "hopping", rapid bouncing for a few minutes.

 

[knewman]

Yikes! What drive mode were you in when it happened? I wonder if it's software or hardware causing this.

Kind of reminds me of the early fly-by-wire bug they discovered in the F-22 Raptor where certain conditions would cause the flight controls to oscillate out of control.

 

[Joelaron]

Both smooth and swift. Today I’ll try sprint. Have not updated to 2.8 yet. I’ll do that tonight.

 

[knewman]

Have you talked to service about it? Make sure you're grabbing timestamps from exactly when it happens so they can check logs for you.

 

[Joelaron]

for sure. I will mention to service when the car goes there in a few weeks for a list of other things that I've been time stamping and capturing with video. I'm updating to 2.8 now, so on the way home tonight, i'll be recording video of the 'hopping' to see if anything changed within the update. (highly unlikely, but worth a scientific test)

 

[Joelaron]

Here’s is today’s video.. repeatable. *sound on!

iCloud Photos - Apple iCloud

View, organize, and share photos and videos with iCloud Photos on the web. Changes will sync across your devices with iCloud.

share.icloud.com

 

[dwfallin]

Wow - that’s crazy! Love to hear what the techs say!

 

[californiaboy935]

Here’s is today’s video.. repeatable. *sound on!

iCloud Photos - Apple iCloud

View, organize, and share photos and videos with iCloud Photos on the web. Changes will sync across your devices with iCloud.

share.icloud.com

Yeah, absolutely don’t drive that. You need service asap. That is something seriously wrong with the suspension or drive train.

Park that thing and get service to come early and flat bed it.

 

[Joelaron]

**UPDATE**. chatted w/ SC today in Millbrae, and we're going to 'wait and see' since this happens in only one specific spot on the road (100% reproducible). That being said, if there is anyone in the San Francisco area and would like to try w/ their GT.

this is exactly where it happens when I accelerate on the onramp: 37.803637, -122.452239 (also see attached image).

would love to hear from anyone else, if it happens to you. the SC said that as long as the car feels safe.. i'm good.. and it does, just NOT on that onramp.

 

[borski]

That is so weird