Engines revs in neutral

mrringodi · 10-15-2010, 07:55 PM

Wondering if anybody has experienced your engine reving up and down while in neutral at a light. My 6mt did it the other day for the first time but has not done it since.

OverDrive · 10-17-2010, 12:43 AM

It could be a fuel pump issue. The N54's HPFP does this when the pump is going bad. I'm not sure about the S65's pump though. Although I heard some earlier 2008 models may have had faulty pumps. Hopefully someone that knows about this chimes in.

Krozi · 10-17-2010, 01:11 AM

Sounds like idle control valve to me.

Poppin Fresh · 10-17-2010, 09:38 AM

Quote:

Originally Posted by Krozi

Sounds like idle control valve to me.

+1

Dntlvet · 10-17-2010, 09:42 AM

HPFP on an M3?

JCtx · 10-17-2010, 05:53 PM

Quote:

Originally Posted by Krozi

Sounds like idle control valve to me.

Indeed. How many miles? I've seen most fail between 16 and 20K miles, but a few a lot earlier than that.

LateBraking · 10-17-2010, 06:02 PM

Mine failed at 3K, lol. What year is your car and how many miles on it? If it's a 2007(EU) or 2008 with 15k+ miles on it, it's probably about time for the idle control valve to go bye bye like most people here have said.

Krozi · 10-17-2010, 06:10 PM

Quote:

Originally Posted by elp_jc

Indeed. How many miles? I've seen most fail between 16 and 20K miles, but a few a lot earlier than that.

I have 25k miles on my car and haven't had a problem with the idle control valve yet

Looking forward to it

niqui · 10-17-2010, 06:53 PM

revs vary by like two hundred'ish rpm when steady idling dependent on clutch-in or clutch-out.
try it.

i think car needs to be fully warmed up and like at a stop light you will notice it.

mrringodi · 10-17-2010, 07:01 PM

car is an 08 with 21000 miles. Took it in to dealer and they ran diagnostics and found nothing wrong.

10-15-2010, 07:55 PM	#1
mrringodi Second Lieutenant 12 Rep 213 Posts Drives: e90 M3 Join Date: Sep 2006 Location: Los Angeles iTrader: (0)	Engines revs in neutral Wondering if anybody has experienced your engine reving up and down while in neutral at a light. My 6mt did it the other day for the first time but has not done it since. __________________ www.ameegoproductions.com
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10-17-2010, 12:43 AM	#2
OverDrive CHEAT TO WIN!! 99 Rep 1,350 Posts Drives: E92 M3, 718 GT4 Join Date: Oct 2007 Location: Toronto iTrader: (0)	It could be a fuel pump issue. The N54's HPFP does this when the pump is going bad. I'm not sure about the S65's pump though. Although I heard some earlier 2008 models may have had faulty pumps. Hopefully someone that knows about this chimes in.
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10-17-2010, 01:11 AM	#3
Krozi Colonel 167 Rep 2,736 Posts Drives: 2008 E92 ///M3 Alpine White Join Date: Oct 2009 Location: SoFla - Bonita Springs iTrader: (24)	Sounds like idle control valve to me. __________________ 2008 E92 ///M3 Alpine White//Fox Red//6MT// Florida Bimmer - Join us on FaceBook!
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10-17-2010, 09:42 AM	#5
Dntlvet Dntlvet 11 Rep 447 Posts Drives: 10 M3 Sedan,13 GT-R BE,13 Pors Join Date: Jul 2009 Location: Wisconsin iTrader: (0)	HPFP on an M3?
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10-17-2010, 06:02 PM	#7
LateBraking Brigadier General 326 Rep 3,882 Posts Drives: Relatively Quick. Join Date: Sep 2008 Location: U.S.A. iTrader: (27)	Mine failed at 3K, lol. What year is your car and how many miles on it? If it's a 2007(EU) or 2008 with 15k+ miles on it, it's probably about time for the idle control valve to go bye bye like most people here have said.
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10-17-2010, 06:53 PM	#9
niqui Brigadier General 127 Rep 3,110 Posts Drives: Jet Black E92 M3 Join Date: Feb 2009 Location: Canada iTrader: (7)	revs vary by like two hundred'ish rpm when steady idling dependent on clutch-in or clutch-out. try it. i think car needs to be fully warmed up and like at a stop light you will notice it. __________________ Jet Black E92 M3
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10-17-2010, 07:01 PM	#10
mrringodi Second Lieutenant 12 Rep 213 Posts Drives: e90 M3 Join Date: Sep 2006 Location: Los Angeles iTrader: (0)	car is an 08 with 21000 miles. Took it in to dealer and they ran diagnostics and found nothing wrong. __________________ www.ameegoproductions.com
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