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Old 03-12-2017, 01:32 PM   #1
vaux
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Default 2017 Impreza low acceleration issue?

So not sure how to tackle this, but I've seen some posts mentioning a possible 'TCM / ECM' update.

I've noticed that ever since I've own my Impreza (since January), my 0-25(ish) when accelerating at low throttle (not pushing down hard on gas), always seems to be very sluggish.

It's almost like the car is requesting MORE throttle to catch and gain speed. This mainly happens at low speeds and upwards to 25mph I want to say. Even sometimes I notice a slight budge or jolt while slowly pressing down on the gas.

Is this something normal? Some friends have stated that it's a typical 'CVT' thing. But I wasn't entirely sure based on some of the stuff I've been reading.

My buddy just got a 17 Forester and claims he feels something similar at low speeds / low rev.
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Old 03-12-2017, 04:17 PM   #2
drpoop
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Buy a WRX if you don't like it. You bought an ecobox not a muscle car.
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Old 03-12-2017, 04:37 PM   #3
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Quote:
Originally Posted by drpoop View Post
Buy a WRX if you don't like it. You bought an ecobox not a muscle car.
Heh, I'm not looking for speed. My concern was the lag/hesitation response. But based on what you said (since it seems like you are a well versed Subaru owner), my problem is that I don't own a WRX.

Thanks!
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Old 03-12-2017, 04:45 PM   #4
Minorthreat7171
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Call your dealership and ask if there's an update for the "TCM/ECM".

Other than telling you, "You have a warranty, use it." theirs not much more I can add to this.
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Old 03-12-2017, 04:53 PM   #5
vaux
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Originally Posted by Minorthreat7171 View Post
Call your dealership and ask if there's an update for the "TCM/ECM".

Other than telling you, "You have a warranty, use it." theirs not much more I can add to this.
That's what I'm leaning towards too. I think I'll wait till after this snowstorm were about to get and see what they can do for me. Thanks!
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Old 03-12-2017, 05:34 PM   #6
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Don't know anything about TCM/ECM updates but what you're describing sounds like my experience as well. Pretty sure it's just the vehicle.

This is my first CVT and it took me a month or so to adjust to the throttle and where its power is. I'm real easy on the gas for the first second when accelerating from a stop and then give it more power after that initial second and the engine seems to grunt to life. My old Mazda3 had lots of go from the second you pushed the gas but then the power fell off. The Impreza seems to be the opposite.

Let us know what the dealer says about a TCM/ECM update. I love the car but am open to loving it even more!
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Old 03-12-2017, 06:16 PM   #7
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If you don't want to trade it for a WRX, contact throttlehappy and ask if he has an ETA for 2017 tunes, or if he plans to do them at all. That helps a bit.
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Old 03-12-2017, 10:57 PM   #8
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Originally Posted by nrosenth View Post
Don't know anything about TCM/ECM updates but what you're describing sounds like my experience as well. Pretty sure it's just the vehicle.

This is my first CVT and it took me a month or so to adjust to the throttle and where its power is. I'm real easy on the gas for the first second when accelerating from a stop and then give it more power after that initial second and the engine seems to grunt to life. My old Mazda3 had lots of go from the second you pushed the gas but then the power fell off. The Impreza seems to be the opposite.

Let us know what the dealer says about a TCM/ECM update. I love the car but am open to loving it even more!
Sounds like we're in the same boat. Yeah my last car (a Focus) had a MUCH different acceleration and didn't have that jutter / hesitation at low speed. I'm assuming it is just the CVT. I'm going to hit up Subaru later this week to see what they say though.
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Old 03-13-2017, 04:17 PM   #9
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The CVT keeps the engine at low rpm's. Maybe even too low. Now that the 2017 Impreza has 7 gear ratios instead of 6, I wonder if the rpm's are lower a slower speeds compared to the earlier models. I know with mine, I'll be in "5" sometimes going less than 40.
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Old 03-13-2017, 04:19 PM   #10
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The few times I've driven a crosstrek with paddles, I found it shifts annoyingly high when you try to upshift. Like you can't use the paddles to keep it below 3000rpm even on slow acceleration.

Regular mode with no fake gears actually feels a lot better to me... maybe because I've learned how to control the RPMs by controlling the throttle
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Old 03-13-2017, 06:08 PM   #11
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Quote:
Originally Posted by CLL_OBP View Post
The CVT keeps the engine at low rpm's. Maybe even too low. Now that the 2017 Impreza has 7 gear ratios instead of 6, I wonder if the rpm's are lower a slower speeds compared to the earlier models. I know with mine, I'll be in "5" sometimes going less than 40.
This is one thing I'm finding weird on my 2017. Cruising at about 95km/h (~60mph) I notice that the engine prefers to run at ~2100 rpm, and the indication for gas consumption is quite high for that.

If I go up a gear on manual, it cruises at the same speed about 1,500-1,800 rpm and indicator for fuel consumption goes down.

By no means I claim to understand this, but I don't get it why it would keep a higher RPM when it could cruise at a lower one and save gas.

Maybe I need to check for an update? I got the car last week ...
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Old 03-15-2017, 11:17 AM   #12
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Quote:
Originally Posted by rafaelrms View Post
This is one thing I'm finding weird on my 2017. Cruising at about 95km/h (~60mph) I notice that the engine prefers to run at ~2100 rpm, and the indication for gas consumption is quite high for that.

If I go up a gear on manual, it cruises at the same speed about 1,500-1,800 rpm and indicator for fuel consumption goes down.

By no means I claim to understand this, but I don't get it why it would keep a higher RPM when it could cruise at a lower one and save gas.

Maybe I need to check for an update? I got the car last week ...
I've noticed this as well, 50-75 mph will be 5th or 6th gear, if I upshift to 7th it will go for a few seconds then revert from 7th to D and drop back into 6th.

I have rarely seen my car driving in 7th gear, even with the cruise set at 85
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Old 03-15-2017, 03:27 PM   #13
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I gotten accustomed to shifting into manual when i get up to speed on the highway and upshifting to 7. The only downside i can see is that if you get in a jam and need some power, you need to downshift like 3 "gears" to get enough juice to make an evasive move.

Otherwise 1-2 is usually fine.
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Old 03-15-2017, 03:42 PM   #14
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If you guys are having problems like that you should probably email/call SoA. They released a couple CVT updates for the 2012s after about a year to address issues that were of a similar type but not exactly the same thing. I doubt they'd release any updates if no one points out any issues.
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Old 03-16-2017, 12:30 PM   #15
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Quote:
Originally Posted by drpoop View Post
If you guys are having problems like that you should probably email/call SoA. They released a couple CVT updates for the 2012s after about a year to address issues that were of a similar type but not exactly the same thing. I doubt they'd release any updates if no one points out any issues.
I shot an email over to them. I'll post here if they respond.
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Old 03-16-2017, 12:32 PM   #16
rafaelrms
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Quote:
Originally Posted by vaux View Post
I shot an email over to them. I'll post here if they respond.


They responded to me telling to go see the dealership

Not SOA but Subaru of Canada instead.
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Old 03-16-2017, 12:43 PM   #17
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That doesn't mean they didn't document it though...
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Old 03-16-2017, 01:35 PM   #18
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Quote:
Originally Posted by rafaelrms View Post
This is one thing I'm finding weird on my 2017. Cruising at about 95km/h (~60mph) I notice that the engine prefers to run at ~2100 rpm, and the indication for gas consumption is quite high for that.

If I go up a gear on manual, it cruises at the same speed about 1,500-1,800 rpm and indicator for fuel consumption goes down.

By no means I claim to understand this, but I don't get it why it would keep a higher RPM when it could cruise at a lower one and save gas.

Maybe I need to check for an update? I got the car last week ...
I do 60 for about 15 miles on my way in. For the most part, it's flat, sea levelish. I do ~1500rpm in 7th (in D). Give it ever such a slight incline, it'll get up to 2k rpm in 6th quick, but smoothly. You won't feel the shift.

--kC
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Old 03-25-2017, 12:06 PM   #19
pprknight
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Default 2017 Cvt

I can see a post on the 5th Gen Subaru Impreza forum that mentions a TSB 11-172-17 but I can find no other evidence of it. Sounds like your problem but ....

A letter yesterday from Subaru about a ECU related recall but not this one - can't seem to find it today! One day old memory seems to recall fuel vapor lock and a fan. Looks like WTP75 on MySubaru site (if you registered your car for that) but everything there says TBD.

Post on TSB 11-172-17 located here:
http://www.impreza5.com/forum/10-eng...low-speed.html

It might be occurring occasionally with my 17 Premium Impreza. It was my feel that it's the CVT shifting up too high too soon for the true situation and then adjusting. Western PA rolling hills? Rpm had dropped to a 1000 or so and although it didn't buck like a lugging manual transmission car there was a single "kick back" like sensation. The transmission then down shifted as I gave it more throttle. Almost felt like a manual transmission downshift without enough throttle - the car decelerates and you go forward.

Subaru has tried to make the CVT shift like a traditional automatic because folks did not like the rubber band (gum bands here in Pittsburgh) feel. Felt almost like a slipping clutch! But that high mileage rating has to be from an early up-shift program. Just don't drive into the guy in front of you while trying to figure this out. The crazy radio/infotainment unit is enough of a distraction!
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Old 03-25-2017, 03:04 PM   #20
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"high mileage rating"

You realize the 2012s had port injection and a normal CVT and only got 2mpg less EPA rated?
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Old 03-26-2017, 02:54 AM   #21
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Quote:
Originally Posted by pprknight View Post
Subaru has tried to make the CVT shift like a traditional automatic because folks did not like the rubber band (gum bands here in Pittsburgh) feel. Felt almost like a slipping clutch!
I think it's moreso the engine. The smaller 2.0 liter FB20 doesn't have enough guts for this wonderful CVT and AWD system. When I had the larger FB25/CVT Forester loaner for a few days, the NVH was like day and night. There wasn't a rubber band or slipping feel. It just went smoothly and quietly. It could definitely use 30+ more hp.
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Old 05-18-2018, 09:52 AM   #22
ObewanKenobi
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I was told when I bought the car that the ECU has to go through a "learning" period. The car has to learn many things and learn your driving style as well. I know this sounds strange. My dealer told me to do "jack rabbit" starts as much as I could (but not to redline it) for the first month of ownership.
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