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Old 01-15-2020, 02:20 AM   #76
rohantad
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Join Date: Oct 2016
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2015 WRX STi
Silver

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Having the same issue on my 15 STI. Bought it new in 2014 and it has never been in any accidents.

Recently in Nov 2019 the power steering rack was replaced under ext warranty because the original one was leaky. After this I bought Michelin PS4s from Costco and noticed that the car consistently pulled to the right during any highway speed acceleration. I got the alignment checked at the dealer that did the rack replacement and they said everything still looks good.

2 weeks later the car still is pulling to the right at highway speeds to I decide to pay for another alignment at a different Subaru dealership. The car still pulls to the right at highway speed acceleration after the alignment. I decide to leave the car with the dealer to check the ps rack and anything else that could cause this issue. They report back that they could not find anything wrong with the car (they manage to scratch the steering wheel during this time but kindly offer to replace it).

I then took the car back to the original dealer that did the power steering work and the technician and service advisor ride along with me. They also agree the car is pulling hard to the right "enough to change lanes". The technician swaps the front two tires and adjusts the alignment. The car now pulls slightly to the left while accelerating but is driving much better. The service advisor recommends that this is a tire pull and that I contact Costco and get 4 new tires.

I then get my steering wheel replaced and toe re-set by the secondary dealer trying to work on the car.

The Costco saga was long and arduous but in short they replaced all 4 tires with a new set of Michelin PSS. I had been running these same tires previously for 20k miles so I figured it would be a good idea to go back to them. I drove the car around right after the install and the car STILL pulled to the right.

At this point I am baffled by what could be causing this issue. The car drove straight before the steering rack was replaced... but its interesting to note that the first set of PSS tires I replaced the OEM tires with also had a strong pull that switched directions when front tires were swapped. The tire shop just replaced all 4 tires and the car drove straight after that. I would be more than shocked if I have had 3 sets of high end Michelin tires that are defective. I honestly am not sure where to go from here. The car is still under extended warranty for a few months, but the dealers can't seem to find anything actually wrong with the car. I am pretty close to giving up and selling the car at this point.. but if anyone has any advice that can save it.....
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Old 01-19-2020, 09:49 PM   #77
Skeller03
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Member#: 510875
Join Date: Jan 2020
Location: Troy, OH
Vehicle:
2019 WRX STI
Dark Gray Metallic

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Hey all, here to add another story to this "Pulling under acceleration" condition. Mine pulls both while accelerating and while cruising and I've had a heck of a journey working through it.

I've got a '19 STI that I ordered and picked up back in Aug, 2018. I was running stock Yokohama summers and started noticing the issue in the first 1000 miles. My first service for it was in Oct 2018 at Wagner Subaru in Dayton, OH -- I replaced all four tires with Michelin Pilot Sport A/S 3+ and got an alignment. I needed the all seasons for Ohio winters and figured I'd do a complete reset of tires / alignment while I was at it.

I was back in the dealership in Jan 2019 for the same issue. Wagner Subaru did another alignment and sent me on my way.

5/3/19, back in the dealership again for the same issue. The service manager verified the condition and stated he noticed the pulling below 20mph. He ordered a warranty replacement tire and scheduled a follow up.

5/10/19, I was back at the dealership to get the warranty tire installed. The service manager installed the shaved warranty tire and verified it didn't fix the issue and advised me to contact Corporate Service.

So I contact them and for the next 6 weeks get strung along with "we'll have an answer for you later this week." I finally had enough and sent them an email saying I'll be getting a lawyer and what do you know... later that day they have the solution for me! Their engineering team concluded that the source of my issue is my Michelin tires, and they offer to replace them with another set of stock Yokohama summers. Knowing that I've had Stock Yokohamas (not from the bad week of production) and now Michelins (and the warranty replacement), and all of them had issues, I wasn't buying their "solution."

So I went the lawyer route. Through that, I got in contact with a Professional Engineer who testifies in court as a Tire Expert. He advised me to do thorough tire rotation testing. I even bought a third set of tires (Continental ExtremeContact DWS) and repeated the rotation testing and relayed my results to him. At the end of it, he concluded that my results indicated a vehicle defect and was willing to write a report supporting that.

Step 1 of the legal process consisted of writing letters to Subaru requesting they either replace my defective vehicle, or repurchase it. They didn't budge from their offer for summer tires. Step 2 would be to file a lawsuit. So my choice was: 1) Invest potentially $15k in legal fees (not lawyer fees, those are free like the commercials always say) to maybe win, or 2) back off the legal path. Seeing as how I could still get normal trade in for the car, the math just doesn't make sense to risk $15k.

As a last resort to try to get help with this, I sent the CEO an email. Maybe sounds silly, but I know those sometimes make it through. Unfortunately it got funneled back into the normal customer service chain and I got stuck in the same loop about tires. Then, in December I got an email from a coworker asking if I had seen TSB 04-25-19R (MC-10164445-0001). Wouldn't you know, Subaru had a TSB detailing the exact issue I have and it was dated 4/25/19.... 10 days before my third appointment at Wagner Subaru. So here's my question... Why had I never been told about this TSB? Not by Wagner Subaru. Not by Corporate Service (twice). Not by Subaru Legal.

If you google that TSB, notice the recommended repaired: Change the alignment, and make the Front Toe pigeon toed beyond the original tolerance. To me this is a resolution, not a solution. It's acknowledging a vehicle defect, and then puts more burden on the owners whose tires will now prematurely wear. How is that an allowable solution?

I brought this TSB up to corporate service and told them I didn't want the alignment, I wanted the vehicle defect fixed. They offered me a $1500 coupon towards a new car and then offered to refund one of my tire purchases if I signed an NDA.... #Pass. My voice to relay this story is worth more than the $1k for tires.

I'm looking to sell my car now. I have been thoroughly disappointed that my childhood dream car has been such a disaster, and incredibly frustrated with the correspondence I've had with Subaru's various outlets. I hope my story helps people dealing with this same issue. If it's a TSB, I know there's others out there with the same issue. Don't let Subaru yank you around with it. It's not a tire issue. It's really not an alignment issue. It's a defect in the suspension setup, somehow, somewhere, that they've realized the cheapest way to "resolve the phenomenon" is to mess with the alignment. Good luck.
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Old 01-25-2020, 11:57 AM   #78
BurninSTI
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Just deflate the left tires so it pulls to the left some.
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Old 01-25-2020, 12:47 PM   #79
Scorpius
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2016 WRX/STI ISM

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Or just buy some Michelin tires.
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Old 02-25-2020, 09:33 AM   #80
sonnyjack
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Quote:
Originally Posted by Skeller03 View Post
Hey all, here to add another story to this "Pulling under acceleration" condition. Mine pulls both while accelerating and while cruising and I've had a heck of a journey working through it.

I've got a '19 STI that I ordered and picked up back in Aug, 2018. I was running stock Yokohama summers and started noticing the issue in the first 1000 miles. My first service for it was in Oct 2018 at Wagner Subaru in Dayton, OH -- I replaced all four tires with Michelin Pilot Sport A/S 3+ and got an alignment. I needed the all seasons for Ohio winters and figured I'd do a complete reset of tires / alignment while I was at it.

I was back in the dealership in Jan 2019 for the same issue. Wagner Subaru did another alignment and sent me on my way.

5/3/19, back in the dealership again for the same issue. The service manager verified the condition and stated he noticed the pulling below 20mph. He ordered a warranty replacement tire and scheduled a follow up.

5/10/19, I was back at the dealership to get the warranty tire installed. The service manager installed the shaved warranty tire and verified it didn't fix the issue and advised me to contact Corporate Service.

So I contact them and for the next 6 weeks get strung along with "we'll have an answer for you later this week." I finally had enough and sent them an email saying I'll be getting a lawyer and what do you know... later that day they have the solution for me! Their engineering team concluded that the source of my issue is my Michelin tires, and they offer to replace them with another set of stock Yokohama summers. Knowing that I've had Stock Yokohamas (not from the bad week of production) and now Michelins (and the warranty replacement), and all of them had issues, I wasn't buying their "solution."

So I went the lawyer route. Through that, I got in contact with a Professional Engineer who testifies in court as a Tire Expert. He advised me to do thorough tire rotation testing. I even bought a third set of tires (Continental ExtremeContact DWS) and repeated the rotation testing and relayed my results to him. At the end of it, he concluded that my results indicated a vehicle defect and was willing to write a report supporting that.

Step 1 of the legal process consisted of writing letters to Subaru requesting they either replace my defective vehicle, or repurchase it. They didn't budge from their offer for summer tires. Step 2 would be to file a lawsuit. So my choice was: 1) Invest potentially $15k in legal fees (not lawyer fees, those are free like the commercials always say) to maybe win, or 2) back off the legal path. Seeing as how I could still get normal trade in for the car, the math just doesn't make sense to risk $15k.

As a last resort to try to get help with this, I sent the CEO an email. Maybe sounds silly, but I know those sometimes make it through. Unfortunately it got funneled back into the normal customer service chain and I got stuck in the same loop about tires. Then, in December I got an email from a coworker asking if I had seen TSB 04-25-19R (MC-10164445-0001). Wouldn't you know, Subaru had a TSB detailing the exact issue I have and it was dated 4/25/19.... 10 days before my third appointment at Wagner Subaru. So here's my question... Why had I never been told about this TSB? Not by Wagner Subaru. Not by Corporate Service (twice). Not by Subaru Legal.

If you google that TSB, notice the recommended repaired: Change the alignment, and make the Front Toe pigeon toed beyond the original tolerance. To me this is a resolution, not a solution. It's acknowledging a vehicle defect, and then puts more burden on the owners whose tires will now prematurely wear. How is that an allowable solution?

I brought this TSB up to corporate service and told them I didn't want the alignment, I wanted the vehicle defect fixed. They offered me a $1500 coupon towards a new car and then offered to refund one of my tire purchases if I signed an NDA.... #Pass. My voice to relay this story is worth more than the $1k for tires.

I'm looking to sell my car now. I have been thoroughly disappointed that my childhood dream car has been such a disaster, and incredibly frustrated with the correspondence I've had with Subaru's various outlets. I hope my story helps people dealing with this same issue. If it's a TSB, I know there's others out there with the same issue. Don't let Subaru yank you around with it. It's not a tire issue. It's really not an alignment issue. It's a defect in the suspension setup, somehow, somewhere, that they've realized the cheapest way to "resolve the phenomenon" is to mess with the alignment. Good luck.
Thanks for posting!!

I have been living this exact nightmare since September 2019. My wrx-sti limited drove perfectly from the date of purchase (Apr 2019) thru beginning of Sept 2019 which is when I went in for my one comp oil change and tire rotation. When I got the car back it was IMPOSSIBLE to drive. It literally changed lanes for me by pulling insanely hard to the left. Returned to the dealership and asked what they did to my car and was told that they only moved front to back and back to front. Told them to go on test drive and they agreed the car was pulling strongly to the left. Proceeded to move the wheels to their original position and this changed nothing. Car was at this point NOT pushing to the right under acceleration.

Dealer kept the car for about 5 days before settling on the tires as an issue. This was an easy fallback. Dealer purchased new Yokohama's and said all was well. I told them their explanation made no sense and that I would most likely be back once I moved to all-season tires. While the new OE tires were an improvement the car still didn't track straight, still pulling left and now pushing right under acceleration. It's possible it was doing this at the same time as the hard pull left, but that pull was so strong I might not have noticed. With the second set of OE tires I can literally be on the right side of the crown, release tension on the steering wheel, and the car will change lanes to the left after only a few seconds. My all-seasons are Michelin PS A/S 3+'s so definitely not a discount tire.

Went to the dealer and they again said to bring the car back "because it's probably the tires" so I said no thanks and began the lemon process. Here in Maryland you get once chance to fix a steering and/or braking related problem and since I consider the car unpredictable and thus unsafe it has sat in my driveway since early November. SOA ignored my letter so I had to contact the SAG's office, who agreed I followed the proper steps. They sent a follow-up letter and wouldn't you know, suddenly SOA is responsive. We've played a bit of phone tag but I've told them they need to buy the car back as the only acceptable solution.

The TSB you reference seems to be the process they went through with my car but which was unsuccessful and led to the decision to blame the tires. Keep in mind that my car drove flawlessly PRIOR to my trip to the dealer and the tire rotation. I never noticed the pull to the right under acceleration, nor any type of pull to the left while cruising. Literally the car was perfect!

I find it highly unlikely that three sets of tires from two different manufacturers have an issue which creates unsafe driving conditions for a vehicle which did not experience any issues until the OE tires/wheels were "rotated" by the dealer. Given that no explanation makes sense and that the condition has remained unresolved I am requesting Subaru repurchase my vehicle.

Best of luck to you as you fight to resolve this issue

SJ
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Old 02-26-2020, 03:49 AM   #81
jeffambo
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Member#: 507933
Join Date: Nov 2019
Chapter/Region: BAIC
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Obsidian Black Pearl

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Quote:
Originally Posted by Turpid Porpoise View Post
You shouldn't be shifting in corners. What you are experiencing is weight transfer and is to be expected if you are shifting mid turn. When you are on the throttle in a turn the weight shifts on to the rear tires, when you let off to shift all of the weight shifts to the front tires which will dramatically increase front end grip and decrease rear end grip which will destabilize the rear of the car.
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Old 03-19-2020, 12:12 AM   #82
mleroux
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Member#: 508710
Join Date: Nov 2019
Chapter/Region: TXIC
Location: Fort Worth, TX
Vehicle:
2020 WRX STI
MGM

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Brand new 2020 here and I have the same issue. I even bought a new set of wheels and tires and the issue got worse. If it's not alignment or tires... not sure what this can be.
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Old 03-19-2020, 01:24 AM   #83
murrdogg24
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Join Date: Dec 2003
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Location: Colorado Springs
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2020 STI
Crystal White Pearl

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Following this thread...I currently have 900 miles on my 2020 and it's still driving straight.
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Old 03-19-2020, 08:34 AM   #84
spoolinsti05
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2005 TickingTimeBomb
Jr tuned TT Sleeved

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It's the **** compliance bushing design causing torque steer. It gets worse once you add mods and gain power. Plus I'm sure the front differential split has some play in this roll.

This is why I love the GDB chassis. We have a way better design for lower control arm bushings. Upgrade to a poly compliance bushing (if they even make them yet). And get it re-aligned.

I'm very disappointed how Subaru has changed and made things cheaper. Just to make other things better. Like interior and technology.

I wonder when they will make a decent multi-link suspension with double wishbone. It's sad how a performance oriented car can't maintain a alignment spec while being loaded into a corner. Without running a super stiff spring and or sway bar.
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Old 03-19-2020, 02:37 PM   #85
murrdogg24
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Crystal White Pearl

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Quote:
Originally Posted by spoolinsti05 View Post
It's the **** compliance bushing design causing torque steer. It gets worse once you add mods and gain power. Plus I'm sure the front differential split has some play in this roll.

This is why I love the GDB chassis. We have a way better design for lower control arm bushings. Upgrade to a poly compliance bushing (if they even make them yet). And get it re-aligned.

I'm very disappointed how Subaru has changed and made things cheaper. Just to make other things better. Like interior and technology.

I wonder when they will make a decent multi-link suspension with double wishbone. It's sad how a performance oriented car can't maintain a alignment spec while being loaded into a corner. Without running a super stiff spring and or sway bar.
a quick look on whitelines' website shows front control arm and rear trailing arm bushings...maybe i should get....anyone with the whiteline anti-lift kit wanna chime in...?
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Old 03-19-2020, 02:45 PM   #86
spoolinsti05
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Jr tuned TT Sleeved

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Quote:
Originally Posted by murrdogg24 View Post
a quick look on whitelines' website shows front control arm and rear trailing arm bushings...maybe i should get..
I would for sure. The factory ones are way to soft. They're a common failure point in Honda's.

They also need to be clocked correctly when installed. Note the orientation of the factory ones. Or flow the instructions with the new ones if they want them installed differently.
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Old 03-19-2020, 07:29 PM   #87
murrdogg24
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Crystal White Pearl

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Quote:
Originally Posted by spoolinsti05 View Post
I would for sure. The factory ones are way to soft. They're a common failure point in Honda's.

They also need to be clocked correctly when installed. Note the orientation of the factory ones. Or flow the instructions with the new ones if they want them installed differently.
ALK and roll center adjuster kit made a huge difference on my GD....I'm sure it would on this platform as well....OP should look into those mods before thinking that their car is totaled lol....
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Old 11-17-2020, 11:02 AM   #88
mayaki
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Location: Wake Forest, NC
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White

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I have a 2018 STI which just started pulling to the left.

I noticed this after I changed the pads and rotated the wheels @ 35k miles. The wheels are aftermarket and the tires are 265/35 R18 Continental DWS06 with about 10k miles on them. I bought this car with 2500 miles on it and had no issues with the original wheels or tires.

The car only pulls to the left when accelerating and pulls to the left when hard braking. It rolls straight down the road and under light acceleration. It also doesn't behave the same 100% of the time. Some days it pulls harder to the left than other days. The brakes don't appear to be sticking, but the front drivers side pads were more worn than the front passenger side. The wheel bearings feel fine all the way around the car.

I'll rotate my wheels back and see if the issue goes away. I'll measure the circumference of the tires to make sure they are all the same. Maybe the differential is compensating while under light load and locking under more extremes.

Is this a differential issue or software issue? If anyone had any resolution for this problem, please let me know.
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Old 11-20-2020, 07:06 PM   #89
rohantad
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Join Date: Oct 2016
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2015 WRX STi
Silver

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It seems to me if you are seeing more wear on one side vs the other it COULD be a sticky caliper or something slightly misaligned. Maybe try re-tracing your steps on the pad-slap? See if a shim is slightly misaligned?

I found an article that goes into more detail on brake pull diagnostics, hope it helps:
https://www.tomorrowstechnician.com/...e-diagnostics/

Quote:
Originally Posted by mayaki View Post
I have a 2018 STI which just started pulling to the left.

I noticed this after I changed the pads and rotated the wheels @ 35k miles. The wheels are aftermarket and the tires are 265/35 R18 Continental DWS06 with about 10k miles on them. I bought this car with 2500 miles on it and had no issues with the original wheels or tires.

The car only pulls to the left when accelerating and pulls to the left when hard braking. It rolls straight down the road and under light acceleration. It also doesn't behave the same 100% of the time. Some days it pulls harder to the left than other days. The brakes don't appear to be sticking, but the front drivers side pads were more worn than the front passenger side. The wheel bearings feel fine all the way around the car.

I'll rotate my wheels back and see if the issue goes away. I'll measure the circumference of the tires to make sure they are all the same. Maybe the differential is compensating while under light load and locking under more extremes.

Is this a differential issue or software issue? If anyone had any resolution for this problem, please let me know.
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