Odd idle

Barrique91 · 10-16-2018, 11:34 AM

My idle is fine when I start the car and 95% of the time. I noticed yesterday and today that while I was waiting in traffic this started happening. Car is a 2006 325xi. I have attached a video of the idle. Anyone ever have this happen to them? Any ideas or suggestions is appreciated! Thanks..

ryan stewart · 10-16-2018, 11:46 AM

Ive not diagnosed it on an E9X model but historically it was due to a vac leak but given that its not consistent its probably the DME responding to a bad signal from something like the MAF. Youll probably have a code.

kickserve · 10-16-2018, 11:57 AM

Happened to me recently and turned out to be a bad coil.

Pladi · 10-16-2018, 12:39 PM

It can be soo many things from lambda sensor to vacuum to ignition to fuel.. get codes. Anecdotal stories rarely solve technical problems..

Barrique91 · 10-16-2018, 12:47 PM

Will check codes in about an hour. Thank you for the replies guys.

Barrique91 · 10-16-2018, 02:04 PM

These are all of the codes I got.

ryan stewart · 10-17-2018, 04:20 PM

Doubt its your ECU fan causing it.

Clear the codes and run again just in case. If that alt code comes back check the voltage while running. It could be an issue with the alt or the sensor for the charging system. IIRC these are linked now and the car outputs varying voltages based on the needs of the battery so its not universally 14v anymore.

ryan stewart · 10-19-2018, 07:05 AM

Reset it, drive it, reread it. Just to be sure.

Sounds like something is amiss with the charging system, generator/voltage regulator might be off. Odds are that is causing the battery charging code as well.

10-16-2018, 11:34 AM	#1
Barrique91 First Lieutenant 396 Rep 307 Posts Drives: 2006 325xi Touring 6MT Join Date: Apr 2018 Location: Idaho, USA iTrader: (0) Garage List 2006 BMW 325xi [0.00]	Odd idle My idle is fine when I start the car and 95% of the time. I noticed yesterday and today that while I was waiting in traffic this started happening. Car is a 2006 325xi. I have attached a video of the idle. Anyone ever have this happen to them? Any ideas or suggestions is appreciated! Thanks.. __________________ 325xi Touring - 6MT - Sport Package
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10-16-2018, 11:46 AM	#2
ryan stewart Major 2197 Rep 1,322 Posts Drives: 2008 328it Join Date: Aug 2012 Location: Atlanta, GA iTrader: (0)	Ive not diagnosed it on an E9X model but historically it was due to a vac leak but given that its not consistent its probably the DME responding to a bad signal from something like the MAF. Youll probably have a code.
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10-16-2018, 11:57 AM	#3
kickserve Enlisted Member 28 Rep 39 Posts Drives: 2012 e91 xdrive Join Date: Oct 2017 Location: Michigan iTrader: (1)	Happened to me recently and turned out to be a bad coil.
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10-16-2018, 12:39 PM	#4
Pladi Lieutenant Colonel 718 Rep 1,753 Posts Drives: 2011 335i xdrive Join Date: Nov 2017 Location: Waterloo, ON Canada iTrader: (0)	It can be soo many things from lambda sensor to vacuum to ignition to fuel.. get codes. Anecdotal stories rarely solve technical problems..
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10-16-2018, 12:47 PM	#5
Barrique91 First Lieutenant 396 Rep 307 Posts Drives: 2006 325xi Touring 6MT Join Date: Apr 2018 Location: Idaho, USA iTrader: (0) Garage List 2006 BMW 325xi [0.00]	Will check codes in about an hour. Thank you for the replies guys. __________________ 325xi Touring - 6MT - Sport Package
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10-16-2018, 02:04 PM	#6
Barrique91 First Lieutenant 396 Rep 307 Posts Drives: 2006 325xi Touring 6MT Join Date: Apr 2018 Location: Idaho, USA iTrader: (0) Garage List 2006 BMW 325xi [0.00]	These are all of the codes I got. Attached Images __________________ 325xi Touring - 6MT - Sport Package
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10-17-2018, 04:20 PM	#7
ryan stewart Major 2197 Rep 1,322 Posts Drives: 2008 328it Join Date: Aug 2012 Location: Atlanta, GA iTrader: (0)	Doubt its your ECU fan causing it. Clear the codes and run again just in case. If that alt code comes back check the voltage while running. It could be an issue with the alt or the sensor for the charging system. IIRC these are linked now and the car outputs varying voltages based on the needs of the battery so its not universally 14v anymore.
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10-19-2018, 07:05 AM	#8
ryan stewart Major 2197 Rep 1,322 Posts Drives: 2008 328it Join Date: Aug 2012 Location: Atlanta, GA iTrader: (0)	Reset it, drive it, reread it. Just to be sure. Sounds like something is amiss with the charging system, generator/voltage regulator might be off. Odds are that is causing the battery charging code as well.
	Appreciate 1 Barrique91395.50 Quote