('19+) car shudders at low speeds - Subaru Forester Owners Forum
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post #1 of 23 (permalink) Old 05-06-2019, 08:24 AM Thread Starter
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car shudders at low speeds

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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post #2 of 23 (permalink) Old 05-06-2019, 08:59 AM
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What you're experiencing seems to be what this product was designed for. I'm not sure how much it would help but I imagine it's a somewhat common issue if there's already a solution being made.

https://andersondesign-fab.com/produ...00-41022al04a/

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post #3 of 23 (permalink) Old 05-06-2019, 09:58 AM Thread Starter
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I realized there's a whole thread on the Ascent Forums describing some similar issues. This post here really does a good job of describing what I feel at low speeds: https://www.ascentforums.com/forum/9...html#post78169

The later posts also suggest that as the CVT breaks in, the feeling will improve. Here's to hoping that's right... but I'm eager to hear if other Forester owners have similar experiences.
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post #4 of 23 (permalink) Old 05-07-2019, 12:20 PM
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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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post #5 of 23 (permalink) Old 05-07-2019, 12:45 PM
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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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post #6 of 23 (permalink) Old 05-07-2019, 02:33 PM
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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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post #7 of 23 (permalink) Old 05-08-2019, 06:26 AM Thread Starter
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Quote:
Originally Posted by johndixs View Post
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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post #8 of 23 (permalink) Old 05-08-2019, 10:46 AM
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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.

Be careful what you wish for.
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post #9 of 23 (permalink) Old 05-08-2019, 06:19 PM
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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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post #10 of 23 (permalink) Old 05-08-2019, 07:55 PM
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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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post #11 of 23 (permalink) Old 05-09-2019, 03:59 AM
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I get this at lower speeds as well.

19 Forester Premium
16 STI Limited
06 4Runner
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post #12 of 23 (permalink) Old 05-09-2019, 07:58 PM
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I also get the lurch when slowing down. Not sure why we need to feel the CVT shifting. Blah.
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post #13 of 23 (permalink) Old 05-10-2019, 06:58 AM
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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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post #14 of 23 (permalink) Old 05-10-2019, 07:24 AM
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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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post #15 of 23 (permalink) Old 05-20-2019, 06:19 AM Thread Starter
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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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