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Old 06-25-2016, 02:01 PM   #1
Slaughterrmelon
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Default 2017 WRX rough idle

So I picked up a 2017 WRX limited at the beginning of this month. It's been cool. Only mods right now are 35% tint (lowest legally allowed here) and mudflaps mostly to protect the paint, not the biggest fan of how they look.

Anyway, the day I picked up the car while the salesman and I were sitting in the car with the car on I noticed the rough idle. I mentioned it and he said it was the "boxer rumble" which I now know refers to the exhaust and doesn't really exist on the 2015+. My salesman was kind of a moron but I felt bad because he spent a lot of time with me so I felt I should give him the sale. Later that same day I felt uneasy about it and took it to my mechanic who said it might just be because it's a new engine.

The rough idle doesn't start until the engine warms up and gets down to about 500RPMs. The car noticeably shakes while sitting in it and if you pop the hood you can see the engine shake when it happens. It doesn't happen at regular intervals just kind of randomly. Thought it would get better with time but I think it might be getting worse. Noticed earlier today that it happened but was sustained over a couple of seconds as opposed to one shake every so often. The RPM needle doesn't really bounce around when it happens.

Anyone else have this issue or know if its normal? The car has about 750 miles since I have a decent commute. The car hasn't been over 4k RPM's or 60MPH as per what the salesman said for break-in period. 95% of my driving is on the freeway and I usually just cruise control it at 58. I noticed it has hit 62MPH once in a while going downhill in cruise control but I'm quite sure break in has more to do with RPM's than exact MPH.

Plus side to being in the break in period is I get 30mpg on my way to work and 40mpg on my way home (there's a long uphill stretch).

Thanks for the help. Wondering if I should take it back to the dealer to have them look at it. There's a few other issues that have been bugging me like constantly having to make the AC only blow at my face. On the screen it shows it's only blowing out the top vents but I can feel it blowing on my legs so I have to turn it to blow on both then back to just top vents and it closes the leg vents. Quite irritating being that it's brand new.
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Old 06-25-2016, 03:51 PM   #2
Jkmaynard
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Yes take it back lol the break in. Has nothing to do with the weird idle I abused the hell out of my car from mile one when I got my 06wrx make Subaru fix it something is obviously not right with it
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Old 06-25-2016, 07:26 PM   #3
shakur45
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Yea dude sounds like you got some problems, take it in sooner rather then later... And for god sakes man, get that thing over 62mph!!!
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Old 06-25-2016, 10:22 PM   #4
NYStyles
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I have a 2017 WRX base and mine does not do that. Ive had it for five days.


On a side note, you really should not be using cruise control during break in. And who told you not to go over 60MPH? What? Did you look at your manual on what Subaru says?
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Old 06-26-2016, 12:28 AM   #5
Jkmaynard
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All the break in crap is a myth these engines will spin bearings and inevitably implode cylinder 4 even if you grandma it the cars hole life well at least the EJ25 motors will
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Old 06-27-2016, 10:56 PM   #6
Slaughterrmelon
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Thanks guys. Setup an appointment for service next week. Thinking about just trading it in for an STI anyway. Should have bought one in the first place since it was only $1k more.
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Old 06-27-2016, 11:56 PM   #7
Krang
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2017 WRX vs STi is not even a comparison

Completely different drivetrain. I'm going to bet the reason the STi is only $1k more is because it's using a motor that hasn't significantly changed since 2004, whereas the WRX is using a relatively advanced ( for subaru ) motor.

I realize that has nothing at all to do with your OP, so in response to that, most car salesman I've met are not car guys, and I wouldn't trust them farther than I can throw them. Absolutely schedule a service checkup, and don't take NO for an answer with the idle shake, it is not normal under any circumstance and needs to be addressed.
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Old 06-28-2016, 04:02 AM   #8
Slaughterrmelon
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Well it was also one 1k more because I got all the options. Smart key, Harman Kardon, BSM, SRVD, and all that jazz. One company has a monopoly here and you can't just get the options you want they get the options in packages and they also don't negotiate especially one wrx's and sti's. So you pay msrp plus tax. Msrp on mines was like 347xx. I think msrp on the sti base is 35xxx. Or it was. The 2017 is 36xxx.

I know the dealer is gonna give me BS about it being normal. I test drove 3 wrx's and didn't notice the shake in any of them. But the service department here has pretty bad reviews. Even told the salesman I was worried about buying the car because service department has such bad reviews but I figured it's a new car and I wouldn't have to deal with them. My last car was an Acura and never once needed service until about 7 or 8 years when the starter died.

Is the sti more reliable? I don't plan any engine mods really. Figure the engine is old so they should have perfected it by now.
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Old 06-28-2016, 08:57 AM   #9
Obviously Tyler
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It's probably just the Direct Injection. My car does the same thing. Not worried about it.
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Old 06-28-2016, 10:36 AM   #10
one109grand
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Take it back ASAP! My car (2012 WRX) had a rough idle around 3500 RPMs that I noticed around 4k miles and told the dealer about...they asked if any indicator lights were on (there weren't) and then said it was just normal rumble. Not that much later, I had a rod go...18 days in the shop and a short block replacement was the cure. After this experience, I would make sure I take my car back for resolution as soon as I ran into any problem.
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Old 06-28-2016, 12:34 PM   #11
nofriends
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Quote:
Originally Posted by one109grand View Post
Take it back ASAP! My car (2012 WRX) had a rough idle around 3500 RPMs that I noticed around 4k miles and told the dealer about...they asked if any indicator lights were on (there weren't) and then said it was just normal rumble. Not that much later, I had a rod go...18 days in the shop and a short block replacement was the cure. After this experience, I would make sure I take my car back for resolution as soon as I ran into any problem.
Idle is not 3500rpm...
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Old 06-28-2016, 03:44 PM   #12
Strex
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Your car shouldn't be idling at 500 RPM but it will rise and fall slightly. mine, once warmed up, idles at about 800-900. And it has a roughness too it that rises and falls somewhat. I like it. As long as the cars not stalling I wouldn't worry about this, it honestly sounds normal.
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Old 06-28-2016, 04:30 PM   #13
seroki
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The rough idle is normal for DIT engines. My last last 3 cars have been Direct Injection. All had a slightly rough idle.
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Old 06-29-2016, 12:04 AM   #14
shakur45
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It ultimately may be because you went 62 mph during break in period! What were you thinking man! Take it back to the dealer, it's ruined.

P.s just kidding it's gonna be fine... Post a vid and we will watch it.
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Old 06-29-2016, 09:53 PM   #15
donkiboy
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I've experienced the exact same thing on my '15 WRX. The engine idle would dip and shake for a split second, and then go away. There's no pattern or consistency at all, and just happens randomly.
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Old 06-29-2016, 10:09 PM   #16
littledrummerboy
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OP, get it checked. And just because you bought the car from that dealer, you don't have to go to them for service. Find another dealer with a better reputation.
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Old 06-30-2016, 12:47 PM   #17
whiplash willy
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I have the intermittent stumble/light shake at idle as well, when my car is warmed up and I stop at a stoplight. The same feeling you get when you first start it up and it has a rough idle, which is normal from what I have read. I have 1600 miles on my 2016 WRX, and it has done it since I drove off the lot.

I keep going back and fourth on whether it is normal or not.

Our engines, as well as the FA20 in the BRZ/FRS and the FBs in the Imprezas & ECT have a known idle issue along with a TSB, that is caused by Cam Sensors and or Oil Control Valves, however, it presents in an intermittent 300+ RPM dip, to the point where the car almost stalls, then the RPM shoots back up to around 1000rpm, and a CEL comes on.

http://www.ft86club.com/forums/showthread.php?t=15577

What I experience, once the car is warm and AC/HVAC and everything else is off, is a slight shake or hickup when idling at a stop light. It varies in frequency and harshness. My RPM will hover around 700rpm, and consistently fluctuate about +/- 50rpm, but the shake isn't always consistent with the RPM movement. It seems to be more frequent and harsher the colder the weather (60*F or lower). When it is 70-80*F or higher it is less frequent and noticeable, or doesn't happen at all. I have noticed that when it is happening, if I turn ON my AC, that will raise my idle, and it will be 100% smooth. I have never had a large RPM Drop or CELs though.

People say this is normal for a subaru, but I have read alot of posts where people say they don't experience this. Maybe they don't notice it? This is my first subaru, and the 2 WRXs I test drove didn't do it, but maybe I just didn't drive them long enough to notice?

I have heard that Rough Idle is normal for a Direct Injected engine, but when I do some googling on it, they attribute GDI Rough Idle to carbon buildup on valves. Brand New Cars wouldn't have this buildup yet though. I have also owned 2 TDIs (2011 and 2012) that didn't do this, but its hard to compare GDI and TDI...

Strangly enough, my last car 2013 4Runner did this as well when I idled in N or P, but not in D. In N or P, the idle would be a bit lower then when in D, and there was no load on the engine. I contributed it to the low idle RPM and the lighter crankshaft counterbalances that were implemented for Fuel Economy reasons. So maybe our engines have a rough idle for some of the same reasons.

So either the rough idle we are experiencing is normal for this engine, as long as there is no large RPM Drop/Jump and CEL. Or maybe what we are experiencing is the beginning stages of the known issue with the Large RPM Drop/Jump/CEL.

The fact that my idle smooths out when I turn on the AC, causing the RPM slightly raise, makes me think it may be normal, and just a harmonic balance thing when this engine runs in the lower rpms. Although, I can't understand why weather would have such an impact on this issue. +/- 20*F can cause the idle to range from 100% Smooth, to having a noticeable shake about every second at idle.

Sure we can bring it into the dealer, but dealers are always quick to say an issue is normal, whether it is normal or not. Dealer Techs don't like to perform warranty work at reduced pay....
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Old 08-23-2016, 01:14 PM   #18
thewengman
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Smile 17 wrx shake and rumble

Same problem for my 17 wrx. 400miles. Dont know yet but I'm going to take it to the dealer until i get a solution lmao.
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Old 08-23-2016, 01:23 PM   #19
intence01
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I'm pretty sure it's normal. My '15 used to do it at idle once warmed up. I was told it's due to the boxer design or whatever. I got e-tuned with bren and the car idled VERY smooth, no issues.
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Old 09-24-2016, 03:13 PM   #20
vitaliid
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Default I might have an answer

I have experienced this issue with my 2016 WRX CVT (warmed up engine, 500 rpm idle, car rumbles/shakes) for the last two days. Started happening after I took the car to my dealer for a battery check (I had few issues with it) and TCM update. Unfortunately Canadian dealers haven't gotten TCM update yet and my VIN is affected. Also, batteries on these cars are weak, especially for Canadian winters.

So, for a good measure, I have turned few power options on my morning drive to the dealer (AC, HD radio, head lights) just to demonstrate that the battery is weak. When I arrived I turned the engine off for a few minutes and I kept radio and lights running while I was on the phone.

Unfortunately, the battery was still tested OK (60%), which is not OK in my book so I guess I have to wait until I get stuck in the winter.

Why I have just wasted your time with this story...here is why.

I just called the dealer to ask if they did anything to the car because it started to happen after I got the car back and the answer was no. However, I was told to go through a procedure of "idle re-learning". Guess what that is...

Run the car for 15 mins at idle with no power accessories on, then turn everything on (head-lights, radio and AC is sufficient) for another 15 mins. So, as you see I might have done that to myself.

I will try the procedure shortly and report back, but I am almost certain it will help based on my experience.
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Old 09-24-2016, 07:16 PM   #21
vitaliid
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Thumbs up I do have an answer!

Just did what I mentioned in the post above and all back to normal. One time I forgot to mention is that after the second 15 mins of idling you need to drive it for a few minutes (not sure if that is essential).
Happy re-learning

Last edited by vitaliid; 09-24-2016 at 07:28 PM.
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Old 09-24-2016, 08:33 PM   #22
YungBoba
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Two guys in here with 500rpm idle, is that normal for the CVT? My 6MT idles at 700 with the AC off, 800 with the AC on. 500 seems really low.
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Old 09-24-2016, 09:07 PM   #23
vitaliid
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After re-learning I think it was between 600-700 without AC. I do not remember exactly, but I did notice it was at least 100 rpm higher.
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Old 09-29-2016, 01:43 PM   #24
TriGuyPNW
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So, I found this post because I noticed my new 2017 (~100 miles) was doing the same thing at idle, so it sounds like it is just a normal thing. It's pretty slight, but you can feel it if you focus on the engine while sitting at a light.

Going to chalk this up to the car being impatient and wanting to go fast
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Old 03-14-2017, 09:43 PM   #25
Actionwrx17
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Default Weird idle

I have a 17 wrx, it also has a weird idle when it's warm, I think it's the tune cause if I'm at a light and it starts shaking and the idle dips, if I put it in 1st at idle it instantly stops and I notice the idle goes up a little
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