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

NOHOME · 10-15-2013, 11:21 PM

Is a stumble during idle normal for this engine?

Muaddib · 10-15-2013, 11:24 PM

Need more information. But it is most likely the a/c compressor is turning on and off.

drewbot · 10-16-2013, 12:05 AM

It's been happening to me when the engine is cold these mornings.

At stop signs it almost feels like it's going to stall when idling.

Only until maybe 3-4 minutes into it, it warms up and my idle doesn't seem so uneasy.

humfrz · 10-16-2013, 12:16 AM

Quote:

Originally Posted by NOHOME

Is a stumble during idle normal for this engine?

I'd say not normal, if the engine is warm.

When it's cold, you may consider letting the engine do its little warm up routine (about 15-20 seconds) before you head out....

humfrz

Akabadaz · 10-16-2013, 01:00 AM

Hmm...when I am stopped at idle such as waiting for someone there is definitely some stumbling/purring occasionally...I also have always had this in my tacoma.

Also, I have driven hundreds of rentals for my job and they do similiar so I'm under the impression that it is normal unless it starts sounding like it is about to turn off...

It would seem to be common normalty but if I'm wrong I would need to get my cars checked out or like the other person said perhaps it has to do with the AC?

Tromatic · 10-16-2013, 01:05 AM

The AC compressor also runs if you have it on "defrost".

lickitysplit · 10-16-2013, 08:47 AM

Mine does this as well, seems to dance between 500-1000 rpm when at idle with the AC on. Pretty sure it has something to do with the compressor as I hear it click when the RPM fluctuates. I recall my brothers tacoma doing the same thing.

strat61caster · 10-16-2013, 12:38 PM

I get a 'stumble' as well when coming to a stop as the rpm drops after I depress the clutch (mostly when cold, seems more stable when warm). Barring the A/C compressor (which results in idle hunting for me) I think it's a consequence of setting the idle as low as possible to squeeze a couple 1/10ths of an mpg out of the car during the city cycle. People with tunes have raised the idle and it seems to get rid of the stumbles and hunting. But I'm just going off of hearsay.

Unless it stalls or you get a check engine light nobody is going to fix the problem for you, it'll be called 'normal operation'. Bleh makes me nervous.

MAPerformance · 10-16-2013, 01:02 PM

You may be experiencing the "idle dip" that these cars have stock. Mine idled pretty low and rough too when I got it. A good tune with a raised idle helped ten fold. Its soooo smooth now.

hmong337 · 10-16-2013, 01:40 PM

Mine does this as well. A few stumbles here and there during a complete cold start but I think it's normal.

hushypushy · 10-16-2013, 07:59 PM

Quote:

Originally Posted by MAPerformance

You may be experiencing the "idle dip" that these cars have stock. Mine idled pretty low and rough too when I got it. A good tune with a raised idle helped ten fold. Its soooo smooth now.

What did you raise your idle to?

TruRace · 10-16-2013, 09:04 PM

I am having similar issues

jflogerzi · 10-16-2013, 11:23 PM

Quote:

Originally Posted by hushypushy

What did you raise your idle to?

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

MAPerformance · 10-17-2013, 10:12 AM

Quote:

Originally Posted by hushypushy

What did you raise your idle to?

I think its around 850 right now.

10-15-2013, 11:21 PM	#1
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)	Seems to stumble at idle? Is a stumble during idle normal for this engine?

10-16-2013, 01:40 PM	#10
hmong337 Emperor JDM Join Date: Jun 2013 Drives: '91 MR2 Gen3 3SGTE, '13 FRS Location: Onterrible, Canada Posts: 1,750 Thanks: 3,498 Thanked 909 Times in 495 Posts Mentioned: 20 Post(s) Tagged: 3 Thread(s)	Mine does this as well. A few stumbles here and there during a complete cold start but I think it's normal. __________________

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10-15-2013, 11:24 PM	#2
Muaddib Mentat Join Date: Jun 2013 Drives: 2013 Scion FRS 6MT Location: Vancouver Posts: 542 Thanks: 666 Thanked 358 Times in 198 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	Need more information. But it is most likely the a/c compressor is turning on and off.

10-16-2013, 12:05 AM	#3
drewbot ( ͡° ͜ʖ ͡°) Join Date: Sep 2013 Drives: '13 Whiteout FR-S A/T Location: Mississauga, ON Posts: 1,996 Thanks: 1,985 Thanked 1,452 Times in 752 Posts Mentioned: 36 Post(s) Tagged: 1 Thread(s)	It's been happening to me when the engine is cold these mornings. At stop signs it almost feels like it's going to stall when idling. Only until maybe 3-4 minutes into it, it warms up and my idle doesn't seem so uneasy.

10-16-2013, 01:00 AM	#5
Akabadaz Junior Member Join Date: Aug 2013 Drives: FRS Location: Southern California Posts: 8 Thanks: 0 Thanked 2 Times in 1 Post Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Hmm...when I am stopped at idle such as waiting for someone there is definitely some stumbling/purring occasionally...I also have always had this in my tacoma. Also, I have driven hundreds of rentals for my job and they do similiar so I'm under the impression that it is normal unless it starts sounding like it is about to turn off... It would seem to be common normalty but if I'm wrong I would need to get my cars checked out or like the other person said perhaps it has to do with the AC?

10-16-2013, 01:05 AM	#6
Tromatic Banned Join Date: May 2013 Drives: FR-S Location: Portland, OR Posts: 2,232 Thanks: 61 Thanked 1,728 Times in 786 Posts Mentioned: 19 Post(s) Tagged: 0 Thread(s)	The AC compressor also runs if you have it on "defrost".

10-16-2013, 08:47 AM	#7
lickitysplit Don't care Join Date: Aug 2013 Drives: 2013 Whiteout FRS Location: Texas Posts: 233 Thanks: 3 Thanked 62 Times in 48 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Mine does this as well, seems to dance between 500-1000 rpm when at idle with the AC on. Pretty sure it has something to do with the compressor as I hear it click when the RPM fluctuates. I recall my brothers tacoma doing the same thing.

10-16-2013, 01:02 PM	#9
MAPerformance Senior Member Join Date: Aug 2012 Drives: Asphalt FRS Location: Cottage Grove, MN Posts: 1,272 Thanks: 669 Thanked 981 Times in 540 Posts Mentioned: 84 Post(s) Tagged: 3 Thread(s)	You may be experiencing the "idle dip" that these cars have stock. Mine idled pretty low and rough too when I got it. A good tune with a raised idle helped ten fold. Its soooo smooth now.

10-16-2013, 09:04 PM	#12
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)	I am having similar issues

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