brz - idle is hunting - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

kravi · 01-16-2016, 05:04 PM

So my idle was acting squirrelly today. I noticed it stopped at a red light. Would sit at 750 for a few seconds, start to drop, the car would vibrate like it was about to stall (at around 500), then it would bounce up to 900 and slow down to 750. Rinse and repeat. This was happening on the way to my destination (where I spent an hour and a half). Also happened on the way home after the car had warmed back up again.

The engine was warmed up by that point, gas is always 93 octaine (from Shell). Outside temperature was around 50 degrees. Car is at 35.5k miles.

Cheers,

--kravi

Lelantas · 01-16-2016, 05:29 PM

What model year? AT or MT? Is your AC on and/or is the knob set to defrost? Multiple owners have reported these issues when the AC compressor kicks in, although I personally haven't had the problem occur.

If the problem is occurring frequently on an earlier model-year BRZ, you can take it in to the dealer to get an ECU update that resolves the issue.

bottle · 01-16-2016, 06:06 PM

Used to happen to me on a MY14 BRZ. Believe there is a TSB fix for it if it's MY13 or MY14 up to a certain VIN.

Click Here

olsonpg · 01-16-2016, 07:01 PM

^

86kahl · 01-16-2016, 07:08 PM

Same situation occurs for me and I have the updated ECU on MY13 and it still happens fairly often, but it's never stalled on me, feels close to it at times tho. I was told it has to do with the DI system cycling between direct and port at idle to burn off carbon build up. I know that carbon build up is a problem for DI only systems so it's not an unreasonable solution.

kravi · 01-16-2016, 07:17 PM

Thanks, this is indeed an MY13 MT limited. I need to take it into the dealer for the frozen window TSB fix, so I might as well do both at the same time.

Obliged!

--kravi

Packofcrows · 01-16-2016, 07:28 PM

Quote:

Originally Posted by kravi

So my idle was acting squirrelly today. I noticed it stopped at a red light. Would sit at 750 for a few seconds, start to drop, the car would vibrate like it was about to stall (at around 500), then it would bounce up to 900 and slow down to 750. Rinse and repeat. This was happening on the way to my destination (where I spent an hour and a half). Also happened on the way home after the car had warmed back up again.

The engine was warmed up by that point, gas is always 93 octaine (from Shell). Outside temperature was around 50 degrees. Car is at 35.5k miles.

Cheers,

--kravi

MY x<2014, go get reflash on ecu. Check air filter, maf(?) sensor.

Also, was your a/c on?

kravi · 01-16-2016, 09:50 PM

Quote:

Originally Posted by Packofcrows

MY x<2014, go get reflash on ecu. Check air filter, maf(?) sensor.

Also, was your a/c on?

Heat was on, not AC. I just replaced my air filter about 2 months ago. Not sure about checking the MAF sensor, I'm not getting any alerts, and not sure what to look for to see if it is borked

--kravi

Packofcrows · 01-16-2016, 11:14 PM

Quote:

Originally Posted by kravi

Heat was on, not AC. I just replaced my air filter about 2 months ago. Not sure about checking the MAF sensor, I'm not getting any alerts, and not sure what to look for to see if it is borked

--kravi

Lol wipe/pressure air blow into it. I use vaccum speed on car engine components

kravi · 01-17-2016, 09:37 PM

Quote:

Originally Posted by Packofcrows

Lol wipe/pressure air blow into it. I use vaccum speed on car engine components

Obliged! I'll check tomorrow. Snowed today, just enough to keep me from wanting to hang around outside.

--kravi

01-16-2016, 05:04 PM	#1
kravi Member Join Date: Nov 2015 Drives: Subaru BRZ Location: Maryland Posts: 56 Thanks: 57 Thanked 13 Times in 10 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	brz - idle is hunting So my idle was acting squirrelly today. I noticed it stopped at a red light. Would sit at 750 for a few seconds, start to drop, the car would vibrate like it was about to stall (at around 500), then it would bounce up to 900 and slow down to 750. Rinse and repeat. This was happening on the way to my destination (where I spent an hour and a half). Also happened on the way home after the car had warmed back up again. The engine was warmed up by that point, gas is always 93 octaine (from Shell). Outside temperature was around 50 degrees. Car is at 35.5k miles. Cheers, --kravi

01-16-2016, 07:01 PM	#4
olsonpg Senior Member Join Date: Jun 2015 Drives: BRZ. R34 GT-T Location: Calgary Posts: 762 Thanks: 737 Thanked 613 Times in 302 Posts Mentioned: 4 Post(s) Tagged: 0 Thread(s)	^ __________________ / SARD / ENKEI / GREDDY / RACESENG / CUSCO / PERRIN / KW / POWERED BY MAX / SPARCO / STOPTECH / BREMBO / ROCKET BUNNY / FULL-RACE twin scroll / OS GIKEN / WHITELINE

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Lightweight flywheel, now struggles to start and revs hunting	ChrisD	Engine, Exhaust, Transmission	14	07-30-2015 06:53 PM
Idle hunting on park	WishIhad86	Issues \| Warranty \| Recalls / TSB	7	04-12-2015 01:19 PM
Texas Job Hunting/Networking Thread	nlamon33	Southwest	41	10-29-2014 05:02 AM
Hunting Rear Diffuser	ROCKETS86	Cosmetic Modification (Interior/Exterior/Lighting)	13	11-13-2013 10:16 PM
Hunting discussion/pictures thread	monjorrow	Off-Topic Lounge [WARNING: NO POLITICS]	4	12-12-2012 07:37 PM

01-16-2016, 05:29 PM	#2
Lelantas Member Join Date: Jan 2015 Drives: '15 BRZ ISM Location: CA Bay Area / San Diego Posts: 63 Thanks: 31 Thanked 22 Times in 19 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	What model year? AT or MT? Is your AC on and/or is the knob set to defrost? Multiple owners have reported these issues when the AC compressor kicks in, although I personally haven't had the problem occur. If the problem is occurring frequently on an earlier model-year BRZ, you can take it in to the dealer to get an ECU update that resolves the issue.

01-16-2016, 06:06 PM	#3
bottle Member Join Date: Jun 2014 Drives: BRZ Location: Toronto, ON Posts: 83 Thanks: 12 Thanked 18 Times in 14 Posts Mentioned: 3 Post(s) Tagged: 0 Thread(s)	Used to happen to me on a MY14 BRZ. Believe there is a TSB fix for it if it's MY13 or MY14 up to a certain VIN. Click Here

01-16-2016, 07:08 PM	#5
86kahl Senior Member Join Date: Aug 2015 Drives: whiteout, dark tint Location: SOCAL Posts: 308 Thanks: 2,453 Thanked 335 Times in 133 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Same situation occurs for me and I have the updated ECU on MY13 and it still happens fairly often, but it's never stalled on me, feels close to it at times tho. I was told it has to do with the DI system cycling between direct and port at idle to burn off carbon build up. I know that carbon build up is a problem for DI only systems so it's not an unreasonable solution.

01-16-2016, 07:17 PM	#6
kravi Member Join Date: Nov 2015 Drives: Subaru BRZ Location: Maryland Posts: 56 Thanks: 57 Thanked 13 Times in 10 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Thanks, this is indeed an MY13 MT limited. I need to take it into the dealer for the frozen window TSB fix, so I might as well do both at the same time. Obliged! --kravi

User Name		Remember Me?
Password