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2019 Forester
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Discussion Starter #1
The 2019 Forester is the first car I've used with a CVT, so I don't know what to expect from normal CVT performance. What I've observed is that when driving in the 20-30 mph range (with the I setting, not the S), under certain conditions I feel the car shudder or jerk. This is particularly noticeable when when letting up on the accelerator where it feels like the car jerks back as though engine braking is coming on hard. It is less noticeable but still present when sometimes it feels like the car surges forward (but I haven't yet been able to determine what triggers that feeling).

None of these seem dangerous as they are all happening at relatively low speeds. But they make the car feel a bit jerky when operating in the 20-30 MPH range. Is this normal CVT performance?
 

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2019 Forester
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Discussion Starter #3

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2019 ForesterTouring 2.5
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100 Posts
My week old 2019 Touring has a drive train glitch that was not present in my 2017 Touring. In “I” mode and slowing down gently in advance of a stop light or stop sign, as the CVT “downshifts” into the lowest ratio, the car exhibits a slight lurch and acceleration forward. It is repeatable. The same behavior is absent in “S” mode.

Wondering if the solution mentioned by Mk2 above applies?
 

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2019 Touring
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200 Posts
I have had the same feeling since new (slows down and then seems to jump) in November, about 4,000 miles ago. It has not gone away and I guess is the price of the CVT.
 

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2019 ForesterTouring 2.5
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100 Posts
Not so sure, Dan: it was not present in my 2017 Touring ( CVT ) and it is not present when I am using the S mode.
 

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2019 Forester
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Discussion Starter #7
My week old 2019 Touring has a drive train glitch that was not present in my 2017 Touring. In “I” mode and slowing down gently in advance of a stop light or stop sign, as the CVT “downshifts” into the lowest ratio, the car exhibits a slight lurch and acceleration forward. It is repeatable. The same behavior is absent in “S” mode.

Wondering if the solution mentioned by Mk2 above applies?
Yes, this "downshifting" is definitely what I experience when gently braking. The slight lurch and acceleration forward is a bit disconcerting when you'd expect the car to be fully decelerating.
 

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2019 Crosstrek 2018 XT
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13,414 Posts
The CVT does not shift up or down under light acceleration in the I mode. I really think it is good to run it in the S# mode periodically and get on it.
 

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2019 ForesterTouring 2.5
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100 Posts
Thanks, adc.. I did a longish run up Rt 1 this morning and found that this small forward lurch point ( during deceleration ) was evident in S mode too- but at a slightly higher speed/engine rpm.
 

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2019 Forester Sport Lineartronic® CVT
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I am also experiencing the same mild jerking or forward surge as RyanB with our 2019 Forester Sport. I am also wondering if it is normal. It felt so odd when it first happened. CVT is also new to us.
 

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For me I associate the shuddering I’m getting from my rpms..when between 1100 and 2000 I will get it especially when at lower speeds and also when right at 1500 it is most noticeable.. also when trying to determine what it was I noticed it more when keeping the engine at the same rpm in that range for a length of time.. once I’m out of that range it stops... I rented a rogue recently and it was really bad in that rpm range so now I’m not so annoyed by it... also should mention I didnt notice this shuddering and vibration until about 4000 miles
 

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the product @ Mk2rocco linked us, is that gona void the warranty? can the dealer install that whilst keeping the warranty?
 

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2019 Forester
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Discussion Starter #15
I've figured out a way to fairly reliably duplicate this behavior. Here's how to duplicate the "surge":
1) Accelerate to ~28 mph
2) Lift off the accelerator to coast (do not brake)
3) At about ~25 mph it'll feel like the car is braking
4) Braking feeling continues until about ~ 15 mph when the braking feeling disappears, which feels like a sudden surge (RPMs go from ~1100 to ~1300 then back down again)

I think this duplicates the issue fairly reliably because I think if you brake, it makes it hard to feel the issue (or maybe even stops it, depending on braking force).
 

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2012 Forester X Auto
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the product @ Mk2rocco linked us, is that gona void the warranty? can the dealer install that whilst keeping the warranty?
Considering the cost of drive train components a warranty void could be costly, but I doubt that would be the case.
You should check with Subaru first.
Typically dealers will only install OEM parts, except for some generic accessories.
Some non OEM parts are also "Approved" - Like the Fumoto drain valve, but whether or not they would install it is a different question...
 

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2013/14 2.5i-L CVT
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Braking feeling continues until about ~ 15 mph when the braking feeling disappears, which feels like a sudden surge (RPMs go from ~1100 to ~1300 then back down again)
It is almost certainly the torque converter unlocking. It fully locks up at 15 mph when accelerating and I assume it unlocks at the same speed. See 'CVT Torque Converter' here; 24 kph=15 mph. Also note item 8: 'Common Operating Characteristics' on the same webpage.
 

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2019 ForesterTouring 2.5
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100 Posts
Thanks, S-Man, I believe you have explained the mechanism. The question is: should the unlock be so, for lack of a better word, “ jerky “? My 2017 Forester did not do this.
 

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2019 Forester
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I feel it too, lower speeds, decelerating. i chalked it up to CVT rubber band stuff that I've heard about. Seems like just the way it is. It's quite noticeable but it doesn't bother me a ton and I know it won't always be in the forefront of my mind as time goes by.
 

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2018 2.0 FXT-Touring CVT
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2,783 Posts
My week old 2019 Touring has a drive train glitch that was not present in my 2017 Touring. In “I” mode and slowing down gently in advance of a stop light or stop sign, as the CVT “downshifts” into the lowest ratio, the car exhibits a slight lurch and acceleration forward. It is repeatable. The same behavior is absent in “S” mode.

Wondering if the solution mentioned by Mk2 above applies?
The solution, as far as I can deduce is... Drive only in S mode.:grin2:
 
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