('19+) Engine seems to surge a little when slowing down - Subaru Forester Owners Forum
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post #1 of 17 (permalink) Old 02-10-2019, 01:07 PM Thread Starter
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Engine seems to surge a little when slowing down

When I am slowing down and preparing to stop, it feels like my car shifts from 2nd gear to first, and then there is a minor engine surge. I haven't looked to see if the RPMs increase. It doesn't always happen, but most of the time. Has anyone else experienced the same?

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post #2 of 17 (permalink) Old 02-10-2019, 01:54 PM
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The torque converter unlocking maybe. At what speed does this happen?

PS: See Common Operating Characteristics, item 8: Shift Shock Upon Deceleration

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Last edited by slothman; 02-10-2019 at 02:01 PM.
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post #3 of 17 (permalink) Old 02-10-2019, 02:06 PM Thread Starter
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Quote:
Originally Posted by slothman View Post
The torque converter unlocking maybe. At what speed does this happen?

PS: See Common Operating Characteristics, item 8: Shift Shock Upon Deceleration
Thanks for the link !!

It occurs when the car is slowing down to stop and it seems like the transmission is shifting from 2nd to 1st gear. It happens right at that point. The speed is around 10-15 MPH.

Last edited by danornan; 02-10-2019 at 02:17 PM.
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post #4 of 17 (permalink) Old 02-10-2019, 11:40 PM
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Originally Posted by danornan View Post
The speed is around 10-15 MPH.
The same webpage states the torque converter fully locks up at 24 kph, which is 15 mph, when accelerating. I'm guessing it also unlocks at about the same speed when decelerating which ties in with my hypothesis.

Fwiw, mine has always done the same thing, though I've experienced it as more of a shove and the kick-in speed is a little lower, around 20 kph/12 mph.
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post #5 of 17 (permalink) Old 02-11-2019, 04:24 AM Thread Starter
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Slothman, that is exactly the feeling. I guess it's just one of the quirks of the Forester/Subaru..... I really am starting to love this car.
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post #6 of 17 (permalink) Old 03-17-2019, 04:48 PM
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Yippee - it is not just me!

I had a Liberty (Legacy 2016) before this Forester and everything accelerating/decelerating were dead smooth. I get this weird surge/shove when slowing as well - it seems to confuse the eyesight as well because as the eyesight is slowing the car to a stop it to gets a surge/shove and seems to panic slightly putting the brakes on harder.

I've also got, what I thought was related, another issue where at higher speeds perhaps around 50-60kph when gently changing from acceleration to deceleration there often a 'flutter' or slight kangaroo hop/judder. Also, when holding a constant speed (again when 50-60kph ish), there is a bit of what I can only describe as 'nervousness' or slight judder sometimes. More noticeable when using eyesight - and it is not the vehicle in front as the Liberty/Legacy has eyesight and there was no issue there - both when following OR when no vehicle in front. Going back many decades to an old standard carburetor car, it is as if the throttle-plate was loose or the accelerator cable was a bit loose.

Could it be related, or something different? I could be hijacking this thread from OP subject - so if different I'll ask on a new thread.... :-)
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post #7 of 17 (permalink) Old 06-15-2019, 02:49 AM Thread Starter
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I was told that the feeling would start to smooth out as I put more miles on my car, but at almost 5,000 miles, it has not changed at all. As I get to about ~10 MPH there is a surge forward that is occasionally annoying. Am I being impatient?
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post #8 of 17 (permalink) Old 06-15-2019, 03:23 AM
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Originally Posted by danornan View Post
I was told that the feeling would start to smooth out as I put more miles on my car, but at almost 5,000 miles, it has not changed at all. As I get to about ~10 MPH there is a surge forward that is occasionally annoying. Am I being impatient?
Yes you are. Like everything else in life it will be a non issue in time. What you feeling is unlocking of the torque converter all part of the AWD.

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post #9 of 17 (permalink) Old 06-15-2019, 03:24 AM
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Perhaps the question is: why is this characteristic noticed by 2019 model drivers, but, as in my case, was never noticed on my 2017 model? It would seem that there has been a design change, one that hopefully can be rectified.

I'd guess that Sloth Man is on point re the torque converter unlocking being the culprit, but then, why was that feature so " transparent " on my 2017 over 33k miles on the same flat roads here in South Florida? Drove a 2008 Mercury Mariner Hybrid with a CVT for four years here and never noticed that CVT torque converter unlock. Something is different in the 2019 design approach I think.

Last edited by johndixs; 06-15-2019 at 04:27 AM. Reason: Added thought
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post #10 of 17 (permalink) Old 06-15-2019, 01:57 PM
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Something is different in the 2019 design approach I think.
I was, and continues to be evident in my 2014 and there have been occasional complaints about all the later years. I think it varies more from car to car than model to model and you got lucky with your 2017.


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post #11 of 17 (permalink) Old 06-15-2019, 02:50 PM
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3300 miles on mine and it really bugs me.
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post #12 of 17 (permalink) Old 06-15-2019, 06:31 PM
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Slothman, there is another thread, in the Driveline and Transmission area, that also addresses this subject. There is a reference to a part which can address a related mechanical issue. To be honest, there isn’t much technical explanation of how that part fits etc. That it is a Subaru part indicates an issue.

Just an opinion, but the reaction of the vehicle to this “ clunk “ in an otherwise smooth part of the driving experience, i.e, a slow, and constant deceleration to a stop, stands out and shouldn’t be there. Think I will attempt to raise the issue with the dealer and SOA.
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post #13 of 17 (permalink) Old 06-15-2019, 06:56 PM
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yup. mine is like clockwork. 15-20mph. notice it all the time when letting off the gas coming to stop at a red light, in traffic, or slowing down in neighborhood roads. when it hits the number, feels like it slows aggressively (slower than what the odometer shows), then lurches/catches to have a normal slow down again.

its my least favorite thing about the car. otherwise I love it.

Everytime I switch between my wifes cr-v and my car, I have to remember how to handle the lurch. Gonna flag this thread in case anyone every comes across someone whos had it fixed.
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post #14 of 17 (permalink) Old 06-15-2019, 07:04 PM
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CVT adjusting to lower ratio steps at lowered speed maybe. I haven't "looked" at the tach when slowing, usually watching ahead, but does seem the RPMs kick up a hair then.

Just guessing. It doesn't bother me, I hadn't even given it a thought until reading this.

...and do have a Safe Trip!
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post #15 of 17 (permalink) Old 06-16-2019, 03:57 AM
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Have this on my 16. No biggie, life goes on.
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