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Old 05-18-2017, 11:30 AM   #26
604wrx
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I'm at 1300km now on 2017 wrx 6mt. I started noticing shakes probably at 500km. idling around 700rpm with slight dips once warmed up.

first time this happened today. car is warm but idling at 1500rpm. last for about 10 to 15 seconds then drops back down to 700. not consistent. only happens on some stop lights. anybody else experience this? I only have radio on.
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Last edited by 604wrx; 05-18-2017 at 11:51 AM.
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Old 05-18-2017, 06:18 PM   #27
Charlie-III
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500 RPM sounds too low, 700-800 sounds better.
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Old 05-19-2017, 12:52 PM   #28
subiwrx12
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Mine does the same, with a tune it improved but stutters at lights sometimes.
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Old 05-19-2017, 05:12 PM   #29
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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.
huh.. My car(14 wrx) had rough idle too.. 5 days later I spun a rod. A day before leak down test :\...



Quote:
Originally Posted by 604wrx View Post
I'm at 1300km now on 2017 wrx 6mt. I started noticing shakes probably at 500km. idling around 700rpm with slight dips once warmed up.

first time this happened today. car is warm but idling at 1500rpm. last for about 10 to 15 seconds then drops back down to 700. not consistent. only happens on some stop lights. anybody else experience this? I only have radio on.

Before my engine went out due to spun rod @ 17k miles I had my engine shake at stop lights. Dealer said it was no big deal since they couldnt replicate. I dont remember the time frame, but then my engine got a spun rod.


On April my engine went out again due to spun rod. Car was down on power 50whp, really really hard to crank over in the morning, I got 2 fuel cuts within a week, car behaved fine when warm. Boost was always reaching peak, no knock, fbk, and AFR seemed fine. A day before my leak down my engine went out.
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Old 05-21-2017, 12:32 AM   #30
f22boy
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Glad to see I'm not even close to the only person to experience this. I've noticed this also with my car, but with it being super sporadic and not throwing any codes I stopped worrying about it.
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Old 05-21-2017, 02:38 PM   #31
Truepsi
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This is the only beef I have so far with this car. The idle is just all over between 500rpm - 800rpm. Car also seems like it takes forever to warm up regardless of the temp out.

What are your boost gauges reading when your car is idle at a stop light with clutch pushed in? Without clutch pushed in?
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Old 05-21-2017, 07:35 PM   #32
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Man you guys worry too much. My '17 has what I term as a lumpy idle. It's a boosted direct injection engine with a light flywheel subject to emissions standards. It's a fookin miracle of engine management and runs great. If it's not kicking codes drive it.

My first car was a '66 Pontiac LeMans powered by a 389 C.I. V8 w/three two barrel carbs and a 4 speed trans. Between the cam and carbs that car had an idle issue.
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Old 05-22-2017, 04:53 PM   #33
Sketch18
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Check the pitch stop? If not thank god for warranty right? 😄
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Old 05-23-2017, 08:40 AM   #34
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Quote:
Originally Posted by TriGuyPNW View Post
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
My 2010 did this as well. Just a slight shimmy every now and again while sitting at idle... totally normal.
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Old 05-28-2017, 01:42 AM   #35
RestlessWRX
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i have a 2017 as well, on the factory tune my car did the same thing i would get a stutter once in a while. Sitting in other subarus i felt it also i think its a boxer engine thing. I've come to accept it.
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Old 05-29-2017, 03:29 PM   #36
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Get rid of OEM tune and enjoy!
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Old 05-29-2017, 03:39 PM   #37
Jersey Man10
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Yeah it's boxer thing
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Old 05-29-2017, 11:27 PM   #38
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I feel like it's just a boxer thing. I have a 2015 WRX and it stutters and shakes at 600-700 rpm. It's done that since day one. My girlfriends 2.5 Forester does the same thing.

However, I drove a 3.6R Outback lately and man...that thing was buttery smooth. Can't stop thinking about it since I drove it. Trade in?
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Old 05-30-2017, 11:51 AM   #39
whiplash willy
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Quote:
Originally Posted by FLTFOUR View Post
I feel like it's just a boxer thing. I have a 2015 WRX and it stutters and shakes at 600-700 rpm. It's done that since day one. My girlfriends 2.5 Forester does the same thing.

However, I drove a 3.6R Outback lately and man...that thing was buttery smooth. Can't stop thinking about it since I drove it. Trade in?
Minor shaking or "shivers" when idling is perfectly normal for a 4 cylinder flat engine. Some call it "The boxer shuffle" or "Boxer Shake", but it is a normal characteristic of flat engines. The technical term for it is "Rocking Couple". This is normal as long as the rpms aren't dropping significantly, and causing the engine to almost stall.

Rocking Couple:
Quote:
The boxer configuration is the only configuration in common use that does not have unbalanced forces with a four-stroke cycle regardless of the number of cylinders, as long as both banks have the same number of cylinders. These engines do not require a balance shaft[4] or counterweights on the crankshaft to balance the weight of the reciprocating parts, which are required in most other engine configurations.

However, in the case of boxer engines with fewer than six cylinders, unbalanced moments (a reciprocating torque also known as a "rocking couple") are unavoidable due to the "opposite" cylinders being slightly out of line with each other.[3] Other engine configurations with natural dynamic balance include the straight-six, the straight-eight, the V12, and the V16.
That 3.6R is smooth, because it is a Flat 6 Engine, which are inherently smooth:

Quote:
The movement of the pistons in a horizontal engine is all in the same plane, so it creates less vibration than in a V-configuration engine; particularly one, like a V6, with an odd number of cylinders on each side of the engine. Unlike the V6 but like the inline-6, the flat-6 is a fully balanced configuration which is in perfect primary and secondary balance. The three cylinders on each side of the crankcase tend to have an end-to-end rocking motion, like a pair of inline-triple engines, but in the usual boxer engine configuration, the imbalances on each side cancel each other, resulting in a perfectly smooth engine.
For those who complain about the RPMs dropping to ~500, and the car stuttering, that is not normal. It is a known issue of the FA20 engine, caused by faulty OCVs. Read through the following thread for more details (Especially page 2):

https://forums.nasioc.com/forums/sho....php?t=2798264

My 2016 WRX has had slight "Shivers" at idle, since new, and it is still doing it at 12k miles. It took me lot of digging to realize it was normal.
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Old 05-30-2017, 08:46 PM   #40
FLTFOUR
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Awesome post, thanks for the info!

To further elaborate on my cars "shutter" it does happen to drop to 500 RPM and it feels like it is going to stall. At that point it will fluctuate between 500-700 RPM for a random amount of time. The only other thing that happens is the turbocharger boost gauge stutters between -9 PSI to -8 PSI and so forth. I will look into the link you shared above now also.
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Old 06-06-2017, 05:40 PM   #41
schwerpunkt
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I have a 2016 WRX CVT that is at the dealer for a second time for rough idle and stall. It has stalled twice in the past two weeks coming to a stop. They currently cannot reproduce the problem and have no idea. It started around 18k miles and the car is factory. No CEL.
ECU has been updated and air filter replaced.
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Old 06-07-2017, 09:50 AM   #42
Abismo
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Quote:
Originally Posted by schwerpunkt View Post
I have a 2016 WRX CVT that is at the dealer for a second time for rough idle and stall. It has stalled twice in the past two weeks coming to a stop. They currently cannot reproduce the problem and have no idea. It started around 18k miles and the car is factory. No CEL.
ECU has been updated and air filter replaced.
have the plugs been checked? are the fouled? gapped correctly? correct plugs?

is the fuel system working ok? proper pressures?
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Old 06-07-2017, 04:40 PM   #43
anarekist
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i picked up a 2017 wrx 2 weeks ago and it does not have a rough idle, it starts off high (2k rpm) in the mornings but after a few mins it goes down to 800-900 and just quietly idles. it does get rough as the rpm's comes down through 1k but that's it.
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Old 06-07-2017, 04:46 PM   #44
schwerpunkt
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Quote:
Originally Posted by Abismo View Post
have the plugs been checked? are the fouled? gapped correctly? correct plugs?

is the fuel system working ok? proper pressures?
All good questions. They haven't been very informative about what they have looked at. Seemed more concerned about recreating the problem first.
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Old 06-08-2017, 01:55 PM   #45
Yoshi99
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Quote:
Originally Posted by schwerpunkt View Post
I have a 2016 WRX CVT that is at the dealer for a second time for rough idle and stall. It has stalled twice in the past two weeks coming to a stop. They currently cannot reproduce the problem and have no idea. It started around 18k miles and the car is factory. No CEL.

ECU has been updated and air filter replaced.


I have had this happen too when the car was cold. Once warmed up, the car runs fine. Dealer flashed an updated tune and so far so good, but only time will tell.
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Old 06-08-2017, 05:48 PM   #46
Shinte122305
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currently hit 1k miles on my 2017 wrx. My car had the rough idl randomly and so does a buddy of mine with a 2015 wrx. I purchased an accesport and threw in there stage 1and i got to say its 80% better at idle (still bumpy every now and then) and about 100% better at daily driving. That damn stock tune is HORRIBLE. the low to mid surge the stock tune has plus the rev hang.......... get the AP its a must with this car.
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Old 06-09-2017, 07:51 AM   #47
schwerpunkt
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The dealer was unable to re create the stall after having the car for four days. As far as they are concerned nothing is wrong. They reset the ECU completely. The tech took a drive with me too and I wasn't able to stall it. He wouldn't comment on what he thinks it could be without a CEL code. I might get an OBD2 adapter and log some data when the car is cold.
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Old 06-09-2017, 09:18 AM   #48
SycsFinest
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Quote:
Originally Posted by whiplash willy View Post
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....
This is the exact same thing I experience. It's not consistent enough for me to be able to ask the dealer about but every once in a while when I stop before it's completely warmed up the RPMs dip and the car almost dies. Only once has it actually died and once restarted it was fine.
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Old 06-09-2017, 11:47 AM   #49
whiplash willy
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Quote:
Originally Posted by SycsFinest View Post
This is the exact same thing I experience. It's not consistent enough for me to be able to ask the dealer about but every once in a while when I stop before it's completely warmed up the RPMs dip and the car almost dies. Only once has it actually died and once restarted it was fine.
Read through this thread, it has good info on your exact issue.

https://forums.nasioc.com/forums/sho....php?t=2798264
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Old 06-16-2017, 08:46 PM   #50
Bengals8402
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Just purchased a 2017 WRX and it does the exact same thing, rough idle every couple seconds after being warmed up.... just hit 1000k mi going to get an oil change this week see what they think
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