Seems to stumble at idle? - Page 2 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

13un · 10-17-2013, 10:49 AM

Same thing happened to me but it went away after awhile

Pbrown · 10-17-2013, 10:55 AM

Quote:

Originally Posted by NOHOME

Is a stumble during idle normal for this engine?

The drop in filter took care of that issue for me.

NOHOME · 10-17-2013, 11:00 AM

Will check to see if it is related to the defrost.

I might have been doing this since new, but you know how once you notice something you can't help but notice it everytime? Seems to stumble a bit too much for a modern engine. That said, the "boxer" family of engines is new to me.

No CEL so I won't rush to the dealer.

Thanks one and all for thoughts.

Jertronic · 10-17-2013, 11:45 AM

I regularly stumble when walking through my doorway on Friday nights.

I am starting to think that just having the radio on is enough of a load on the alternator to cause a blip in the idle... Mine drops from about 550 to 500 rpm when doing the idle drop thing.

hushypushy · 10-18-2013, 07:56 PM

Quote:

Originally Posted by jflogerzi

My tuner did this as well. I think its around 800rpm

Quote:

Originally Posted by MAPerformance

I think its around 850 right now.

Yeah this just seems way more reasonable for a 4-banger, even if it is a boxer.

My idle is always right at 650 but it doesn't feel smooth

Ah, I miss my Honda days. Just turn the idle adjust screw and you're set

NOHOME · 10-18-2013, 09:54 PM

Defroster seems to be the answer. Turned off and less stumble.

whtchocla7e · 10-18-2013, 10:34 PM

My idle is never smooth. Even though the tach needle doesn't bounce, I still feel micro-stumbles at almost regular intervals. Sitting at lights sometimes drives me crazy

I hear the compressor in these cars runs at all times.

TruRace · 10-18-2013, 10:43 PM

My idle occasionally stumbles, even after tune. Kind of annoying.

Fallen43 · 10-18-2013, 10:50 PM

Lets face we may love our cars but the are built like crap it's a shame that they are aware of the trouble and they refuse to fix the issues that so many of us have. Why don't they just get one of these great tuners and get the cars tuned as they should be.

Frstorm · 10-18-2013, 10:52 PM

Fallen- guess my was built better than yours since I have zero complaints. Or maybe I knew exactly what I was buying when I bought it

boxer 2.5 · 10-18-2013, 10:53 PM

It's the nature of the boxer design. IMO!! Every Subi i've had has a rough idle. Not exceptionally rough, but not as smooth as my Honda was. The important part is the way it performs when moving!

TruRace · 10-18-2013, 11:38 PM

Almost feels like the motor is missing too.... and I think the issue lies elsewhere. My idle is at 750 with the tune and it still stumbles.

10-18-2013, 10:34 PM	#21
whtchocla7e Senior Member Join Date: May 2012 Drives: 2013 FR-S Hot Lava Location: CT Posts: 424 Thanks: 30 Thanked 222 Times in 81 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	My idle is never smooth. Even though the tach needle doesn't bounce, I still feel micro-stumbles at almost regular intervals. Sitting at lights sometimes drives me crazy I hear the compressor in these cars runs at all times. __________________ Live to drive another day

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10-17-2013, 10:49 AM	#15
13un Member Join Date: Aug 2013 Drives: FR-S Location: MA Posts: 25 Thanks: 10 Thanked 3 Times in 3 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	Same thing happened to me but it went away after awhile

10-17-2013, 11:00 AM	#17
NOHOME Senior Member Join Date: Jun 2012 Drives: RAVEN Location: LONDON ONTARIO Posts: 787 Thanks: 86 Thanked 786 Times in 341 Posts Mentioned: 12 Post(s) Tagged: 2 Thread(s)	Will check to see if it is related to the defrost. I might have been doing this since new, but you know how once you notice something you can't help but notice it everytime? Seems to stumble a bit too much for a modern engine. That said, the "boxer" family of engines is new to me. No CEL so I won't rush to the dealer. Thanks one and all for thoughts.

10-18-2013, 09:54 PM	#20
NOHOME Senior Member Join Date: Jun 2012 Drives: RAVEN Location: LONDON ONTARIO Posts: 787 Thanks: 86 Thanked 786 Times in 341 Posts Mentioned: 12 Post(s) Tagged: 2 Thread(s)	Defroster seems to be the answer. Turned off and less stumble.

10-18-2013, 10:43 PM	#22
TruRace Senior Member Join Date: Sep 2013 Drives: FRS-Raven-MT Location: Ft. Lauderdale, FL Posts: 336 Thanks: 58 Thanked 143 Times in 99 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	My idle occasionally stumbles, even after tune. Kind of annoying.

10-18-2013, 10:52 PM	#24
Frstorm Senior Member Join Date: Jul 2013 Drives: 2013 Firestorm Location: Arkansas Posts: 356 Thanks: 53 Thanked 89 Times in 63 Posts Mentioned: 1 Post(s) Tagged: 0 Thread(s)	Fallen- guess my was built better than yours since I have zero complaints. Or maybe I knew exactly what I was buying when I bought it

10-18-2013, 10:53 PM	#25
boxer 2.5 Senior Member Join Date: Aug 2013 Drives: 2007 Impreza, 2013 BRZ Location: Vernon, CT Posts: 314 Thanks: 240 Thanked 119 Times in 78 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	It's the nature of the boxer design. IMO!! Every Subi i've had has a rough idle. Not exceptionally rough, but not as smooth as my Honda was. The important part is the way it performs when moving!

10-18-2013, 11:38 PM	#26
TruRace Senior Member Join Date: Sep 2013 Drives: FRS-Raven-MT Location: Ft. Lauderdale, FL Posts: 336 Thanks: 58 Thanked 143 Times in 99 Posts Mentioned: 5 Post(s) Tagged: 2 Thread(s)	Almost feels like the motor is missing too.... and I think the issue lies elsewhere. My idle is at 750 with the tune and it still stumbles.

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