[Alain]

Originally Posted by BMWM.D.

I think what you’re experiencing is different than what was going on with Ted’s car. His problem wasn’t on hard acceleration, but a steady pull to one side when accelerating lightly or even maintaining speed at highway speeds. This was a tire issue, but I haven’t seen anyone else with this symptom. I think Ted’s car is an anomaly.

What myself and pretty much everyone else has complained about is a strange rear end ‘wiggle’ at full throttle — usually when going WOT in a straight line from a roll. It only happens one time (a quick side to side feeling) then is gone. My car did it on day one. I’m guessing this is what you’re feeling.

I’m experimenting with my alignment again. It’s always felt like a rear toe problem to me, but I aligned my car at about 1500 miles and it didn’t go away. So I’ve just been living with it. We just got a brand new alignment machine, so I put the car on it this morning to see how everything looked. It was all over the place. Rear was toed out a little, and front had a ton of toe in.

I don’t really know what to make of it yet or if it’s been fixed. We were having problems with our old alignment equipment for a few years now, so it’s possible it’s been off this whole time. What I found today SHOULD have been causing some goofy behavior. It would be awesome if it’s gone. I need more seat time to be sure.

And yeah, tires CAN cause a pull like Ted had. Hunter Engineering even has a feature on its higher end balancers to identify it and minimize its effect. It’s not much help on cars like ours with staggered tires, but here’s a video that might explain it:

https://youtu.be/hG8Mve2x7Ts

I just re-read the original post. My car is doing exactly what Ted describes. Which is, when already in motion (40-60Mph) under moderate to hard acceleration the car starts to wonder towards the left.

I have never had my car on an alignment machine. I did stress to the dealer, last year when I bought the car, that I wanted the suspension set for street driving and the alignment done accordingly. But who the hell knows what they did or If they even checked the alignment.

I wish there was a way to check the alignment at home. I’m going to start playing with the PSI on my front tires (increasing it) and see what happens.

It’s scary when it happens and you’re not ready for it. Feels like the car is going to turn into the median/concrete divider by itself.

[bobby35ny]

Originally Posted by Alain

I just re-read the original post. My car is doing exactly what Ted describes. Which is, when already in motion (40-60Mph) under moderate to hard acceleration the car starts to wonder towards the left.

I have never had my car on an alignment machine. I did stress to the dealer, last year when I bought the car, that I wanted the suspension set for street driving and the alignment done accordingly. But who the hell knows what they did or If they even checked the alignment.

I wish there was a way to check the alignment at home. I’m going to start playing with the PSI on my front tires (increasing it) and see what happens.

It’s scary when it happens and you’re not ready for it. Feels like the car is going to turn into the median/concrete divider by itself.

Go to any alignment shop and put the car on the rack. Tell them you want the numbers that's all, don't touch the car. Cost me $20!!
Numbers were WAYYYYYYYY off on my car. took the sheet to Chevy and they aligned under warranty. Car is much better now by far.

[BMWM.D.]

Originally Posted by Alain

I just re-read the original post. My car is doing exactly what Ted describes. Which is, when already in motion (40-60Mph) under moderate to hard acceleration the car starts to wonder towards the left.

I have never had my car on an alignment machine. I did stress to the dealer, last year when I bought the car, that I wanted the suspension set for street driving and the alignment done accordingly. But who the hell knows what they did or If they even checked the alignment.

I wish there was a way to check the alignment at home. I’m going to start playing with the PSI on my front tires (increasing it) and see what happens.

It’s scary when it happens and you’re not ready for it. Feels like the car is going to turn into the median/concrete divider by itself.

If it’s a legitimate pull and not the weird rear steer / fishtail thing a bunch of us have, then I’d just start with the basics:

1- Cross swap the tires side to side to see if it changes direction.

2- Get it up on an alignment machine at a reputable shop.

3- If all else fails, have your tires tested on a Hunter Road Force balancer that has straight track. That video link I posted explains why it can happen.

[Alain]

Originally Posted by bobby35ny

Go to any alignment shop and put the car on the rack. Tell them you want the numbers that's all, don't touch the car. Cost me $20!!
Numbers were WAYYYYYYYY off on my car. took the sheet to Chevy and they aligned under warranty. Car is much better now by far.

I had no idea this was a possibility. Going to look into this next week, thank you for the advise.

Originally Posted by BMWM.D.

If it’s a legitimate pull and not the weird rear steer / fishtail thing a bunch of us have, then I’d just start with the basics:

1- Cross swap the tires side to side to see if it changes direction.

2- Get it up on an alignment machine at a reputable shop.

3- If all else fails, have your tires tested on a Hunter Road Force balancer that has straight track. That video link I posted explains why it can happen.

Mine does the little fishtail/wag as well, I chalked that up to the car searching for grip on the initial slam of the gas pedal.

this is a legitimate pull to the left, I actually feel the steering wheel pull to the left under hard acceleration.

EDIT: I just watched the youtube video you linked, thank you for that. I now get how the tire can be the issue. Thank you again for that link, this is why I love coming on here............to learn and share knowledge.

[Mikael]

i had the same problem with my 17 cts-v

[JANNETTYRACING]

UPDATE:

I bought a second car Identical after totaling my first one and learned a bit more about this issue.

After everything is perfect and you get crab walk on light acceleration is it 100% the tires.

However if you get an unsettling left right wiggle it is an Reprogramming issue.

I never knew this with my first car because that was the very first thing they did when I complained about the crab walk on light acceleration, at this point I never went full throttle to experience the Wiggle.

The dealer updated my differential control module and I never had the Wiggle issue but battled the crab walk with 7 alighments, tire rotations, corner weighting etc ultimatley new tires fixed it.

When I bought my second car we put my wheels and tires off my first car, completed a full alighnment, corner weighting, and adjustable sway bar links.

On hard excelleration experience a very unsettling almost violent right left wiggle, I though to myself did I buy a lemon?

After a few months of on and off driving a Light bulb went off coming out of a car show.

Hmmm I wonder if there are any updates for the differential, so the next day drove the car to work and put my IT professional on the task and sure enough there were 5 updates for various modules in the car one of them being the differential.

After the updated flash I now have my car back full throttle it is on a String.

I hope this helps someone looking in to this.

If you are close to me and want to update modules in your GM, Ford or Chryslers we have the equipment and software to do so.

Ted.

[mlee]

Originally Posted by JANNETTYRACING

UPDATE:

I bought a second car Identical after totaling my first one and learned a bit more about this issue.

After everything is perfect and you get crab walk on light acceleration is it 100% the tires.

However if you get an unsettling left right wiggle it is an Reprogramming issue.

I never knew this with my first car because that was the very first thing they did when I complained about the crab walk on light acceleration, at this point I never went full throttle to experience the Wiggle.

The dealer updated my differential control module and I never had the Wiggle issue but battled the crab walk with 7 alighments, tire rotations, corner weighting etc ultimatley new tires fixed it.

When I bought my second car we put my wheels and tires off my first car, completed a full alighnment, corner weighting, and adjustable sway bar links.

On hard excelleration experience a very unsettling almost violent right left wiggle, I though to myself did I buy a lemon?

After a few months of on and off driving a Light bulb went off coming out of a car show.

Hmmm I wonder if there are any updates for the differential, so the next day drove the car to work and put my IT professional on the task and sure enough there were 5 updates for various modules in the car one of them being the differential.

After the updated flash I now have my car back full throttle it is on a String.

I hope this helps someone looking in to this.

If you are close to me and want to update modules in your GM, Ford or Chryslers we have the equipment and software to do so.

Ted.

I'm not sure how I've missed this thread but this is really good news for a lot of folks with the same problem. My 2017 had it and I started this mega thread with lots of others experiencing similar.

https://www.camaro6.com/forums/showthread.php?t=500793

[radz28]

Is there a consensus as to if/what MY this was fixed from the factory? Have these cars left the factory with the updated calibration?

[Jetrep]

great details and summary here

[mlee]

Originally Posted by radz28

Is there a consensus as to if/what MY this was fixed from the factory? Have these cars left the factory with the updated calibration?

Good question... I do know the ZL1's had it from the start 2017, and it didn't go away for a few years.

But if you have it you will definitely know it.

[calypso50kid]

Originally Posted by JANNETTYRACING

UPDATE:

I bought a second car Identical after totaling my first one and learned a bit more about this issue.

After everything is perfect and you get crab walk on light acceleration is it 100% the tires.

However if you get an unsettling left right wiggle it is an Reprogramming issue.

I never knew this with my first car because that was the very first thing they did when I complained about the crab walk on light acceleration, at this point I never went full throttle to experience the Wiggle.

The dealer updated my differential control module and I never had the Wiggle issue but battled the crab walk with 7 alighments, tire rotations, corner weighting etc ultimatley new tires fixed it.

When I bought my second car we put my wheels and tires off my first car, completed a full alighnment, corner weighting, and adjustable sway bar links.

On hard excelleration experience a very unsettling almost violent right left wiggle, I though to myself did I buy a lemon?

After a few months of on and off driving a Light bulb went off coming out of a car show.

Hmmm I wonder if there are any updates for the differential, so the next day drove the car to work and put my IT professional on the task and sure enough there were 5 updates for various modules in the car one of them being the differential.

After the updated flash I now have my car back full throttle it is on a String.

I hope this helps someone looking in to this.

If you are close to me and want to update modules in your GM, Ford or Chryslers we have the equipment and software to do so.

Ted.

when flashing the diff module does it effect the ecu/engine tune at all? i have the wiggle in my 18 1le and im almost certain its never had any updates flashed to it. but its also tuned and has port injection on it as well.

is there an option to send you the module and pay to have you flash it?

[hawk02]

Ted’s info is very interesting.

My ‘17 ZL1 had the wiggle which I never noticed until I replaced the OEM Goodyears with PS4S.

My 2023 CT5-V Blackwing comes standard with PS4S tires and also has the wiggle so I’ve attributed the wiggle more to the tires than anything else.

One would think the eLSD going into a 2023 MY car would have all the latest updates. But maybe not.

[radz28]

Originally Posted by mlee

Good question... I do know the ZL1's had it from the start 2017, and it didn't go away for a few years.

But if you have it you will definitely know it.

The last I noticed, it was only offered for up to 2019... I looked through TechLink and didn't notice/see anything for ZL1s (I noticed references to Auto-X ELSD updates, but I don't think that's what we're talking about here).

What I know is I HAVE noticed that the sway is a lot more pronounced in TOUR mode, under light-to-WOT throttle. In SPORT, it seems to be a LOT less pronounced. I'm still on the original factory tires, but it's behaved this way since right off the dealer lot. The car acts the same on the DRs, too.

I tried ZLE bushings and replaced all the suspension arms in the rear with rod-bearing ends (including the rear cradle braces), but it's still there. That was a lot of work and $$$, lol...

Maybe it has to do with the roads around here, too. Maybe he'd act better at the strip, because all of my observations have been on the street.

[JANNETTYRACING]

Originally Posted by calypso50kid

when flashing the diff module does it effect the ecu/engine tune at all? i have the wiggle in my 18 1le and im almost certain its never had any updates flashed to it. but its also tuned and has port injection on it as well.

is there an option to send you the module and pay to have you flash it?

We do not have the ability to bench flash diff modules.

I would say have a conversation with your dealer or local GM specialist who has the equipment

We can select which module we want to update and update that module only.

Ted.