('14+) Mild surging feeling under light acceleration - Subaru Forester Owners Forum
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post #1 of 321 (permalink) Old 04-12-2016, 09:04 PM Thread Starter
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Mild surging feeling under light acceleration

I have a new one month old 2016 AU facelift XT, which under light acceleration has a mild on and off surging feeling or mild bucking. Noticed it from day one.
Anyone one else have this on their SJ XT? Not sure if they all do it or not.

Thanks

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post #2 of 321 (permalink) Old 04-12-2016, 09:38 PM
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Interesting...

Which mode does the surging happen? I, S, S#? Auto or Manual paddle shift mode?

do you mind checking the intake clamps if they are tridons brand?

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post #3 of 321 (permalink) Old 04-12-2016, 09:59 PM Thread Starter
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It does it in I and S modes in auto, not sure about S# or in manual?

Clamps are all tight and from memory they have two brands fitted tridon and something else, sorry cant remember the other.
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post #4 of 321 (permalink) Old 04-12-2016, 10:10 PM
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Thanks for the clamps info. Can't believe they still use tridons for 2016s!

I would try some power pulls in manual mode to see if boost is fluctuating or not. As always, safety first!

But anyway, I would also swap the Tridon clamps with the one Danoz recommends.

Can't say about AUTO mode because it is reportedly PFL and FL have different TCM programming.
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post #5 of 321 (permalink) Old 04-13-2016, 03:21 PM Thread Starter
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Cheers. I’ll give it a go in manual mode and see how it goes.
Maybe a couple of days before I get the chance too, I dont get to drive it as often as I would like its the wifes daily driver. Which brings something else into it.. she hasnt mentioned it, even when I drive with her in the car, yet I can feel it? maybe some can feel it and others cant?

As far as I can gather the TCM programming has had a few updates over the few years for drivability and this and that? also I just asked the question on another forum and someone said they could feel the same thing (dont know what year they have ?)
Its usually quite subtle when it happens.
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post #6 of 321 (permalink) Old 05-09-2016, 07:09 AM
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I am having almost the same:

I mode "D" 25% acceleration, 1,900-2,500 rpm, 6-8 psi, temp around 130-180F, A/C on.
Power like fluctuating on 7psi, Literally the car is Jerking.... Mine is a 2014 XT.

Taking it to the dealer tomorrow, btw I got a new CVT 3000 miles ago.

Last edited by 14XT; 05-09-2016 at 07:10 AM. Reason: Missing info.
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post #7 of 321 (permalink) Old 05-09-2016, 02:52 PM Thread Starter
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Quote:
Originally Posted by easy_peasy899 View Post
I would try some power pulls in manual mode to see if boost is fluctuating or not. As always, safety first!
Didn't notice much if any fluctuation in the boost on test but it is way less noticeable in manual mode as the revs are higher in general to what they are in auto, so Im starting to think its just the way the cvt is doing its thing.

Quote:
Originally Posted by 14XT View Post
I am having almost the same:

I mode "D" 25% acceleration, 1,900-2,500 rpm, 6-8 psi, temp around 130-180F, A/C on.
Power like fluctuating on 7psi, Literally the car is Jerking.... Mine is a 2014 XT.

Taking it to the dealer tomorrow, btw I got a new CVT 3000 miles ago.
Yeah, I notice it in I and S modes in auto more than other modes anywhere inbetween 20 - 30 % and around 2000 rpms + or - 500rpms with or without A/C been turned on, but having the A/C on does make it worse.

I would hazard a guess that your TCM would have been updated to the latest software when you had the trans replaced, So it looks like its the way they are now? Or maybe it will get better as the tcm and ecm learn and adjust to your driving?

Let us know what the dealer says.

Cheers
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post #8 of 321 (permalink) Old 05-09-2016, 02:57 PM Thread Starter
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Cant edit my last post for some reason?

Quote:
Originally Posted by 14XT View Post
btw I got a new CVT 3000 miles ago.
Why was the trans replaced?
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post #9 of 321 (permalink) Old 05-09-2016, 03:03 PM
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Originally Posted by bigfella View Post
Cant edit my last post for some reason?



Why was the trans replaced?
Btw I have like 48K Miles on it, cvt replaced around 45K CVT leak around the bell housing location....
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post #10 of 321 (permalink) Old 05-09-2016, 03:15 PM Thread Starter
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Seems a bit over the top to replace it for a leak? was there any other problems with it due to it been ran with low oil etc or can they not get the parts etc to fix the leak ie seals etc?

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post #11 of 321 (permalink) Old 05-09-2016, 08:41 PM
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No other problems, aside fron the leak... Wish me luck for tomorrow. Lol
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post #12 of 321 (permalink) Old 05-09-2016, 09:12 PM Thread Starter
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Strange.. just checked and there's a seal kit available, maybe they weren't feeling confident on doing the repair?

Good luck.
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post #13 of 321 (permalink) Old 05-10-2016, 08:12 AM
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Dealer Can't replicate it, as expected. Suggesting its just a bad fuel, and try changing fuel brands.
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post #14 of 321 (permalink) Old 05-10-2016, 11:08 AM
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Quote:
Originally Posted by 14XT View Post
I am having almost the same:

I mode "D" 25% acceleration, 1,900-2,500 rpm, 6-8 psi, temp around 130-180F, A/C on.
Power like fluctuating on 7psi, Literally the car is Jerking.... Mine is a 2014 XT.

Taking it to the dealer tomorrow, btw I got a new CVT 3000 miles ago.
My car's in the shop for the same issue. The 1st time they suggested it was bad gas as well, but guess what.. It's back!

In the Garage:
15 Forester XT
16 X6 35i
04 M3
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post #15 of 321 (permalink) Old 05-10-2016, 02:55 PM Thread Starter
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Yep I tried different brands of fuel too and it still does it.
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