revs high when in neutral... sometimes

area3z · 10-13-2011, 03:16 AM

last couple of weeks i've been noticing my car revving itself when in neutral and stopped at a red light. slowly revs up to 2K and then drops, slowly. nothing else unusual, oil temps in normal operating range. any suggestions?

Mike Z · 10-13-2011, 05:33 AM

get your car checked up....i know the AC makes the revs go up a little but not up to 2k. could be something wrong with SRM.

ImportConvert · 10-13-2011, 06:13 AM

Could be the IAC is sticking. I don't know if these cars have an IAC, but it sounds like it does and it's sluggish to move once the A/C kicks off.

fuct · 10-13-2011, 02:21 PM

this has been brought up before. id search and find it buuuuuuut im kinda lazy

fosingwo · 10-13-2011, 09:01 PM

do you have Smode on? It happens to me sometimes when I approach the light and I just put it into neutral and it revs alittle thinking i might downshift

MattP725 · 10-13-2011, 09:24 PM

Quote:

Originally Posted by ImportConvert

Could be the IAC is sticking. I don't know if these cars have an IAC, but it sounds like it does and it's sluggish to move once the A/C kicks off.

That is what I was thinking... had this happen in one of my previous cars.

area3z · 10-14-2011, 12:28 AM

Quote:

Originally Posted by fosingwo

do you have Smode on? It happens to me sometimes when I approach the light and I just put it into neutral and it revs alittle thinking i might downshift

i know what you're thinking, but not the case. i can be at a complete stop in neutral when it slowly starts to rev to 2K. also happens with s-mode off.

Big J · 10-14-2011, 12:36 AM

Mine has done this before too, not in s mode. Usually when sitting still in neutral. A exhaust leak or air leak of some sort could maybe cause it.

cossie1600 · 10-14-2011, 12:43 AM

I know the car does that on cold starts (accelerate warm up). I guess if it does it when your motor is warm, you got a problemo.

MattP725 · 10-14-2011, 11:44 AM

It's very likely a vaccuum leak (like the IAC valve)... it will drive just about normal except the idle which is because it is letting in more air than the throttle is requesting which causes the same symptom as putting your foot on the accelerator.

cheshirecat · 10-14-2011, 03:00 PM

Quote:

Originally Posted by MattP725

It's very likely a vaccuum leak (like the IAC valve)... it will drive just about normal except the idle which is because it is letting in more air than the throttle is requesting which causes the same symptom as putting your foot on the accelerator.

I agree with this.

advan37 · 07-08-2012, 01:07 PM

Anyone know where this IAC valve located ??

KERMIT · 07-08-2012, 02:01 PM

Quote:

Originally Posted by advan37

Anyone know where this IAC valve located ??

We don't have one. Our cars have electronic throttle bodies thus it is no longer needed.

ChrisSlicks · 07-08-2012, 02:39 PM

It can be a sticky (or dirty contacts) on the electronic pedal. You can drive around with a ODB-II scanner connected and log the pedal position and throttle position data to see if that is the case.

smoothtransit · 01-29-2015, 12:30 PM

Sorry to bump an old thread. Does anyone have any updates on this problem? The problem occurs not only in neutral but the car will cruise in any gear at around 1600 rpm without me depressing the gas... Sometimes when in neutral ill tap the accelerator and the rpm will drop to normal. Really strange

also: this doesnt happen all the time. Only random days

10-13-2011, 03:16 AM	#1 (permalink)
area3z Base Member Join Date: Feb 2010 Location: chicago Posts: 89 Drives: 09 370Z 6MT sptourin Rep Power: 15	revs high when in neutral... sometimes last couple of weeks i've been noticing my car revving itself when in neutral and stopped at a red light. slowly revs up to 2K and then drops, slowly. nothing else unusual, oil temps in normal operating range. any suggestions?

07-08-2012, 02:39 PM	#14 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 653	It can be a sticky (or dirty contacts) on the electronic pedal. You can drive around with a ODB-II scanner connected and log the pedal position and throttle position data to see if that is the case. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

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10-13-2011, 05:33 AM	#2 (permalink)
Mike Z Base Member Join Date: Sep 2011 Location: San Diego Posts: 76 Drives: 11' 370 Z Rep Power: 14	get your car checked up....i know the AC makes the revs go up a little but not up to 2k. could be something wrong with SRM.

10-13-2011, 06:13 AM	#3 (permalink)
ImportConvert A True Z Fanatic Join Date: Jun 2010 Location: SWMO Posts: 4,454 Drives: 2019 CX5 GT Reserve Rep Power: 7627	Could be the IAC is sticking. I don't know if these cars have an IAC, but it sounds like it does and it's sluggish to move once the A/C kicks off.

10-13-2011, 02:21 PM	#4 (permalink)
fuct A True Z Fanatic Join Date: May 2009 Location: Sugar Land Posts: 3,692 Drives: 97' Ranger :) Rep Power: 24	this has been brought up before. id search and find it buuuuuuut im kinda lazy

10-13-2011, 09:01 PM	#5 (permalink)
fosingwo Base Member Join Date: Jul 2011 Location: NJ Posts: 113 Drives: 05 EVO 8 MR Rep Power: 14	do you have Smode on? It happens to me sometimes when I approach the light and I just put it into neutral and it revs alittle thinking i might downshift

10-14-2011, 12:36 AM	#8 (permalink)
Big J Track Member Join Date: Jun 2010 Location: Memphis Posts: 905 Drives: 370z Rep Power: 16	Mine has done this before too, not in s mode. Usually when sitting still in neutral. A exhaust leak or air leak of some sort could maybe cause it.

10-14-2011, 12:43 AM	#9 (permalink)
cossie1600 A True Z Fanatic Join Date: Jun 2009 Location: californee way Posts: 5,380 Drives: 370, Leaf Rep Power: 30	I know the car does that on cold starts (accelerate warm up). I guess if it does it when your motor is warm, you got a problemo.

10-14-2011, 11:44 AM	#10 (permalink)
MattP725 A True Z Fanatic Join Date: May 2011 Location: Toms River, NJ Posts: 1,904 Drives: 2010 40th Rep Power: 17	It's very likely a vaccuum leak (like the IAC valve)... it will drive just about normal except the idle which is because it is letting in more air than the throttle is requesting which causes the same symptom as putting your foot on the accelerator.

07-08-2012, 01:07 PM	#12 (permalink)
advan37 Base Member Join Date: May 2011 Location: UAE Posts: 63 Drives: 08 G37 Rep Power: 14	Anyone know where this IAC valve located ??

01-29-2015, 12:30 PM	#15 (permalink)
smoothtransit Base Member Join Date: Dec 2014 Location: Seattle Posts: 63 Drives: 09 370 BS 6mt Rep Power: 10	Sorry to bump an old thread. Does anyone have any updates on this problem? The problem occurs not only in neutral but the car will cruise in any gear at around 1600 rpm without me depressing the gas... Sometimes when in neutral ill tap the accelerator and the rpm will drop to normal. Really strange also: this doesnt happen all the time. Only random days