Idle rpm drop - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

j_ros94 · 12-03-2019, 08:24 AM

I heard its normal if ac is on and the idle rpm drop but mine drops if i just turn the fan on for the heat. Is this normal too?

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tomm.brz · 12-03-2019, 08:33 AM

Stock tune is often pretty unstable during idle

j_ros94 · 12-03-2019, 08:35 AM

Quote:

Originally Posted by tomm.brz

Stock tune is often pretty unstable during idle

Im boosted and tuned so i was wondering if that could cause my idle rpm to drop with the fan on

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tomm.brz · 12-03-2019, 08:55 AM

Does it do like that just lately?
Best would be an idle log

j_ros94 · 12-03-2019, 08:57 AM

Quote:

Originally Posted by tomm.brz

Does it do like that just lately?
Best would be an idle log

No its been doing that since i installed it but they said its normal just needed confirmation since its winter and i need the heat. Lol dont want my car stalling on a red light cuz of it

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kev0 · 12-03-2019, 09:16 AM

Quote:

Originally Posted by j_ros94

No its been doing that since i installed it but they said its normal just needed confirmation since its winter and i need the heat. Lol dont want my car stalling on a red light cuz of it

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manual or auto? Just blip the throttle if you feel like you're about to stall. It sounds like the problem is your tune or you have a vacuum leak. We need a log to make sure.

j_ros94 · 12-03-2019, 09:26 AM

Quote:

Originally Posted by kev0

manual or auto? Just blip the throttle if you feel like you're about to stall. It sounds like the problem is your tune or you have a vacuum leak. We need a log to make sure.

Manual. I wish it was my tune but sasha from on point says he doesnt see anything but ill record a log

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tobin · 12-03-2019, 11:36 AM

My stock 2013 does it as well.

Tcoat · 12-03-2019, 12:27 PM

When you turn the fan on with defrost settings on the AC kicks in to dry the air even though it is on a warm setting. This gives you the normal small displacement engine drop in RPM. Perfectly normal. Try turning it onto just the floor settings and a bet you get no drop.

j_ros94 · 12-03-2019, 12:34 PM

Quote:

Originally Posted by Tcoat

When you turn the fan on with defrost settings on the AC kicks in to dry the air even though it is on a warm setting. This gives you the normal small displacement engine drop in RPM. Perfectly normal. Try turning it onto just the floor settings and a bet you get no drop.

Interesting ill try that next time

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Gunman · 12-03-2019, 01:49 PM

My 2013 auto would dip every time I came to a stop, with ,or without ac on. In sport mode it was worse, since it would hold the downshift longer. If I came to a quick stop in sport, I could stall it.

radroach · 12-03-2019, 01:58 PM

@Gunman I read people saying this all the time. I have a feeling there is a fault that isn't tripping a CEL.

Also for reference, when I had an ABS CEL / limp mode, my idle would dip and nearly stall anytime I would brake to a stop.

Decep · 12-03-2019, 08:52 PM

custom tuned edelbrock, almost always a rock solid 900 rpm idle (obviously the tuner raised it). whats your "normal" idle?

Xinnie · 12-03-2019, 09:05 PM

Quote:

Originally Posted by Decep

custom tuned edelbrock, almost always a rock solid 900 rpm idle (obviously the tuner raised it). whats your "normal" idle?

floats around 900 give or take 50

custom tuned jrsc

12-03-2019, 08:24 AM	#1
j_ros94 Senior Member Join Date: May 2019 Drives: 2017 Subaru BRZ Location: Toronto, Ontario Posts: 145 Thanks: 46 Thanked 22 Times in 20 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	Idle rpm drop I heard its normal if ac is on and the idle rpm drop but mine drops if i just turn the fan on for the heat. Is this normal too? Sent from my SM-G960W using Tapatalk

12-03-2019, 12:27 PM	#9
Tcoat Senior Member Join Date: Jul 2014 Drives: 2020 Hakone Location: London, Ont Posts: 69,841 Thanks: 61,656 Thanked 108,295 Times in 46,456 Posts Mentioned: 2499 Post(s) Tagged: 50 Thread(s)	When you turn the fan on with defrost settings on the AC kicks in to dry the air even though it is on a warm setting. This gives you the normal small displacement engine drop in RPM. Perfectly normal. Try turning it onto just the floor settings and a bet you get no drop. __________________ Racecar spelled backwards is Racecar, because Racecar.

12-03-2019, 08:52 PM	#13
Decep Senior Member Join Date: May 2017 Drives: 2013 FR-S Series 10 Location: CA Posts: 1,073 Thanks: 172 Thanked 497 Times in 326 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	custom tuned edelbrock, almost always a rock solid 900 rpm idle (obviously the tuner raised it). whats your "normal" idle? __________________ 2013 FR-S 10 Series ~75k (SOLD) RCE SS-1 Coilovers Corsa Catback Edelbrock Supercharger installed @ 50k

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12-03-2019, 08:33 AM	#2
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,279 Thanks: 515 Thanked 1,121 Times in 811 Posts Mentioned: 70 Post(s) Tagged: 0 Thread(s)	Stock tune is often pretty unstable during idle

12-03-2019, 08:55 AM	#4
tomm.brz Senior Member Join Date: Jan 2017 Drives: brz 2017 hksv2 Location: italy Posts: 2,279 Thanks: 515 Thanked 1,121 Times in 811 Posts Mentioned: 70 Post(s) Tagged: 0 Thread(s)	Does it do like that just lately? Best would be an idle log

12-03-2019, 11:36 AM	#8
tobin Senior Member Join Date: Jun 2013 Drives: '13 BRZ Location: CT Posts: 491 Thanks: 322 Thanked 334 Times in 158 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	My stock 2013 does it as well.

12-03-2019, 01:58 PM	#12
radroach Senior Member Join Date: Feb 2013 Drives: car Location: usa Posts: 2,162 Thanks: 1,028 Thanked 867 Times in 530 Posts Mentioned: 35 Post(s) Tagged: 1 Thread(s)	@Gunman I read people saying this all the time. I have a feeling there is a fault that isn't tripping a CEL. Also for reference, when I had an ABS CEL / limp mode, my idle would dip and nearly stall anytime I would brake to a stop.

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