Weird idle???

triggz · 12-22-2011, 09:57 AM

The other day, I parked my car, put the Ebrake on. Let it cool off.

The car was idling at 550rpm.

Then all of a sudden after about 1-2 minutes, it jumped to 750rpm and stayed there.

What does this mean?

Thanks guys

Stucks · 12-22-2011, 11:00 AM

my car does this too sometimes.

triggz · 12-22-2011, 11:26 AM

ya well its not normal...anyone know?

stratos_335 · 12-22-2011, 11:28 AM

When it's cold outside the car idles at 800 rpm after it gets warmed up

Brey335i · 12-22-2011, 11:29 AM

I have given up on trying to figure out why the 335i idles as it does. It randomly jumps from place to place if you let it sit and idle for a while...

triggz · 12-22-2011, 11:30 AM

my tech was saying something along the lines of a possible vacuum leak?

Tzu · 12-22-2011, 11:31 AM

Unfortunately, it is normal. Slight misfire at idles and it raises RPMS as a fix. My car does it every time I drive longer than say 20 minutes.

triggz · 12-22-2011, 11:50 AM

my car never did this before and i have had full bolt ons with tune for over a year

BoostedE90 · 12-22-2011, 01:11 PM

I know this doesn't help but mine has been doing this quite sometime now. I've considered it to be normal. I've had three injectors replaced, HPFP, all my plugs, and all my coil packs. Like Tzu mentioned once the car gets warmed up I notice it. I really notice when getting off the highway and get stuck at a red light for a good amount of time. I would imagine if it was a boost leak the car would throw a code. Also this happens at idle so there's no boost (maybe a little vacuum) going on during idle.

3coupe · 12-22-2011, 01:30 PM

ever since i put on the intake, dp and FMIC, my car has been idling strangely.

it rarely happens, but it does. the rpms would drop close to 0 and almost stall on its own, then i guess the computer kicks in and revs it up. this is definately not normal, but the car drives fine.

thoughts?

Syndicategt · 12-22-2011, 01:32 PM

Normal.

Large bouncing fluctuations 500 - 1500 (or higher) means you need new injectors/coils/plugs.

triggz · 12-22-2011, 01:37 PM

Quote:

Originally Posted by Syndicategt

Normal.

Large bouncing fluctuations 500 - 1500 (or higher) means you need new injectors/coils/plugs.

It doesn't bounce though. It stays at 750-800rpm and doesnt move.

3coupe · 12-22-2011, 01:41 PM

Quote:

Originally Posted by Syndicategt

Normal.

Large bouncing fluctuations 500 - 1500 (or higher) means you need new injectors/coils/plugs.

so is it normal, or do i need to change things?!

how much is it to replace injectors? i just had coils replaced. what plugs?

12-22-2011, 09:57 AM	#1
triggz Banned 56 Rep 1,224 Posts Drives: E92 335i Join Date: Jun 2010 Location: Toronto iTrader: (2)	Weird idle??? The other day, I parked my car, put the Ebrake on. Let it cool off. The car was idling at 550rpm. Then all of a sudden after about 1-2 minutes, it jumped to 750rpm and stayed there. What does this mean? Thanks guys
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12-22-2011, 11:00 AM	#2
Stucks Lieutenant Colonel 172 Rep 1,909 Posts Drives: 2017 F30 340i Xdrive Join Date: Oct 2010 Location: Montgomery County, MD iTrader: (12)	my car does this too sometimes. __________________ Current: 2017 F30 340i xdrive Previous: 2008 e92 335i coupe: RB turbos, mach 116 race fuel, methanol, alot of boost. Previous: 2003 Honda Accord V6 coupe: AEM V2, zex 75 wet shot (sold)
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12-22-2011, 11:26 AM	#3
triggz Banned 56 Rep 1,224 Posts Drives: E92 335i Join Date: Jun 2010 Location: Toronto iTrader: (2)	ya well its not normal...anyone know?
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12-22-2011, 11:28 AM	#4
stratos_335 First Lieutenant 36 Rep 332 Posts Drives: BMW 335i Join Date: Sep 2009 Location: Greece iTrader: (0)	When it's cold outside the car idles at 800 rpm after it gets warmed up
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12-22-2011, 11:29 AM	#5
Brey335i Banned 112 Rep 4,771 Posts Drives: e46 ///M3 Join Date: Oct 2009 Location: Austin, TX iTrader: (11)	I have given up on trying to figure out why the 335i idles as it does. It randomly jumps from place to place if you let it sit and idle for a while...
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12-22-2011, 11:30 AM	#6
triggz Banned 56 Rep 1,224 Posts Drives: E92 335i Join Date: Jun 2010 Location: Toronto iTrader: (2)	my tech was saying something along the lines of a possible vacuum leak?
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12-22-2011, 11:31 AM	#7
Tzu Lieutenant Colonel 29 Rep 1,551 Posts Drives: 335i Join Date: Jun 2010 Location: Toronto iTrader: (1)	Unfortunately, it is normal. Slight misfire at idles and it raises RPMS as a fix. My car does it every time I drive longer than say 20 minutes.
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12-22-2011, 11:50 AM	#8
triggz Banned 56 Rep 1,224 Posts Drives: E92 335i Join Date: Jun 2010 Location: Toronto iTrader: (2)	my car never did this before and i have had full bolt ons with tune for over a year
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12-22-2011, 01:11 PM	#9
BoostedE90 Lieutenant Colonel 55 Rep 1,690 Posts Drives: e90 335i 6MT Join Date: Nov 2007 Location: Tampa/Gainesville, FL iTrader: (5)	I know this doesn't help but mine has been doing this quite sometime now. I've considered it to be normal. I've had three injectors replaced, HPFP, all my plugs, and all my coil packs. Like Tzu mentioned once the car gets warmed up I notice it. I really notice when getting off the highway and get stuck at a red light for a good amount of time. I would imagine if it was a boost leak the car would throw a code. Also this happens at idle so there's no boost (maybe a little vacuum) going on during idle. Last edited by BoostedE90; 12-22-2011 at 01:21 PM..
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12-22-2011, 01:30 PM	#10
3coupe Captain 31 Rep 645 Posts Drives: BMW 335i Coupe 07 Join Date: May 2007 Location: Somewhere. iTrader: (2)	ever since i put on the intake, dp and FMIC, my car has been idling strangely. it rarely happens, but it does. the rpms would drop close to 0 and almost stall on its own, then i guess the computer kicks in and revs it up. this is definately not normal, but the car drives fine. thoughts? __________________ BMW E92 335i retired: 04 BMW M3 \| 05 Honda S2000 \| 03 BMW 330ci \| 01 Honda Prelude \| 99 Acura Type-R
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12-22-2011, 01:32 PM	#11
Syndicategt Brigadier General 153 Rep 3,730 Posts Drives: 335i Join Date: Sep 2009 Location: Nor Cal iTrader: (11)	Normal. Large bouncing fluctuations 500 - 1500 (or higher) means you need new injectors/coils/plugs. __________________ 2008 BMW 335i e90 - Sold - Rob Beck Turbos / PROcede V5 / Aquamist HFS-4 / AR Downpipes / AE Exhaust / ER Comp FMIC / ER CP / TiAL BOV / Custom Intake / RPI Scoops / Quaife LSD / Swift-Koni Coilovers / DSS HS / Morr VS8.2 Sig Black / Michelin PSS / P3 Boost Guage / M3 body / M3 steering wheel / Adam's Rotors / Hawk HPS / SS lines /
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