Idle Surging

Austin 1439 · 05-29-2014, 09:14 AM

Alot of the time during the day while im out driving in the heat, I will usually get quite a few surges or points where the car whille suddenly jerk, making the idle fall about 200 revs and then balance back out. THIS ALMOST ALWAYS HAPPENS WHEN IT IS WARM OUTSIDE BUT ALMOST NEVER WHEN ITS EARLY IN THE MORNING AND CHILLY. Ive been trying to diagnose it for some time now, but i was recently told by a local indy shop that since it is only when the car is sitting at idle without being under load such as half throttle driving, that it is most likely just a vacuum leak. Can anybody confirm this or give me some type of answer to what I should do?

e92_enthusiast_1 · 05-29-2014, 12:17 PM

Ate you talking about when you're at a stop light it goes from 600 to 800 rpms then back down? It happens like once or twice but then it stops. Thought that was normal for the 335i Idk about the 328. For me it's really rare so Idk. I don't worry about it cause I've seen it before. If your symptom is a little different please elaborate.

r0bert · 05-29-2014, 01:23 PM

want brand gas do you use?

my car jerks like that when I use Sams club premium gas.

DASHOCKER · 05-29-2014, 01:25 PM

hpfp

Austin 1439 · 05-29-2014, 01:26 PM

Quote:

Originally Posted by e92_enthusiast_1

Ate you talking about when you're at a stop light it goes from 600 to 800 rpms then back down? It happens like once or twice but then it stops. Thought that was normal for the 335i Idk about the 328. For me it's really rare so Idk. I don't worry about it cause I've seen it before. If your symptom is a little different please elaborate.

It goes from about 600 to 500 and the car jerks really hard. I use 91 from random places and it jerks no matter what

e92_enthusiast_1 · 05-29-2014, 02:20 PM

Well i probably don't jerk cause i'm in a MT and at idle im in Neutral, is yours AT?

Quote:

Originally Posted by Austin 1439

It goes from about 600 to 500 and the car jerks really hard. I use 91 from random places and it jerks no matter what

DOMs335D · 05-30-2014, 08:43 AM

Quote:

Originally Posted by DASHOCKER

hpfp

He has a 328 not a 335 I don't think it's the hpfp

norsairius · 05-30-2014, 09:13 AM

Could be a gummed up injector, a bad coil pack, bad spark plug, or it could be fixed with a DME update.

My car had a rough idle here and there. The dealership performed SIB 12-21-12 (which I've not been able to find details for) and it seemed to get better. It still happens from time to time, but not as frequently and it smooths out more quickly if it does come up.

Good luck!

X_Drive · 05-30-2014, 11:43 AM

Check your eccentric shaft sensor connector. See if you have oil residue in it. It's a free and easy check and at least you can check that box off the list.

GoRomeo · 05-30-2014, 11:50 AM

Quote:

Originally Posted by Austin 1439

Alot of the time during the day while im out driving in the heat, I will usually get quite a few surges or points where the car whille suddenly jerk, making the idle fall about 200 revs and then balance back out. THIS ALMOST ALWAYS HAPPENS WHEN IT IS WARM OUTSIDE BUT ALMOST NEVER WHEN ITS EARLY IN THE MORNING AND CHILLY. Ive been trying to diagnose it for some time now, but i was recently told by a local indy shop that since it is only when the car is sitting at idle without being under load such as half throttle driving, that it is most likely just a vacuum leak. Can anybody confirm this or give me some type of answer to what I should do?

Before you replace any parts, please test your battery. Do a load test at your local auto parts store. I know it seems odd but I ve seen crazy things happened with our cars and all was due to a low battery. Are you still running on your original battery?

DASHOCKER · 05-30-2014, 02:58 PM

Quote:

Originally Posted by DOMs335D

Quote:

Originally Posted by DASHOCKER

hpfp

He has a 328 not a 335 I don't think it's the hpfp

I can't tell from the e90post phone app who has what. lol

Austin 1439 · 05-31-2014, 03:05 PM

I think I have it narrowed down to the eccentric shaft sensor. It had oil in it when we did the VCG and we didnt think anything of it. I guess thats probably it.

e92_enthusiast_1 · 05-31-2014, 03:27 PM

Hopefully it's that simple. Let us know. So if it has oil do you just clean it or new sensor?

Quote:

Originally Posted by Austin 1439

I think I have it narrowed down to the eccentric shaft sensor. It had oil in it when we did the VCG and we didnt think anything of it. I guess thats probably it.

Austin 1439 · 05-31-2014, 03:28 PM

Quote:

Originally Posted by e92_enthusiast_1

Hopefully it's that simple. Let us know. So if it has oil do you just clean it or new sensor?

Whole new sensor.

e92_enthusiast_1 · 05-31-2014, 03:32 PM

Thx

Quote:

Originally Posted by Austin 1439

Whole new sensor.

05-29-2014, 09:14 AM	#1
Austin 1439 President 7 Rep 239 Posts Drives: e92 Coupe Crimson Red Join Date: Apr 2013 Location: Arkansas iTrader: (0) Garage List 2011 Mercedes-Benz ... [0.00] 2009 Posche Cayenne S [0.00] 2000 BMW 323CI [0.00] 2007 BMW 328xi Coupe [0.00]	Idle Surging Alot of the time during the day while im out driving in the heat, I will usually get quite a few surges or points where the car whille suddenly jerk, making the idle fall about 200 revs and then balance back out. THIS ALMOST ALWAYS HAPPENS WHEN IT IS WARM OUTSIDE BUT ALMOST NEVER WHEN ITS EARLY IN THE MORNING AND CHILLY. Ive been trying to diagnose it for some time now, but i was recently told by a local indy shop that since it is only when the car is sitting at idle without being under load such as half throttle driving, that it is most likely just a vacuum leak. Can anybody confirm this or give me some type of answer to what I should do?
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05-29-2014, 12:17 PM	#2
e92_enthusiast_1 Lieutenant Colonel 35 Rep 1,652 Posts Drives: '10 AW/CR e92 6mt 335i Join Date: Mar 2012 Location: Chandler, AZ iTrader: (1) Garage List 2010 BMW 335i [0.00]	Ate you talking about when you're at a stop light it goes from 600 to 800 rpms then back down? It happens like once or twice but then it stops. Thought that was normal for the 335i Idk about the 328. For me it's really rare so Idk. I don't worry about it cause I've seen it before. If your symptom is a little different please elaborate.
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05-29-2014, 01:23 PM	#3
r0bert Private 14 Rep 96 Posts Drives: 2012 E92 335i, 2008 E90 328i Join Date: Sep 2013 Location: Louisiana iTrader: (0)	want brand gas do you use? my car jerks like that when I use Sams club premium gas.
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05-29-2014, 01:25 PM	#4
DASHOCKER The power of V! 99 Rep 1,971 Posts Drives: 2007 335i coupe steptronic Join Date: Aug 2007 Location: NYC iTrader: (0) Garage List 1998 Lexus Gs400 [0.00] 2010 ebony & ivory [0.00] 2006 BMW X3 [0.00] 2009 pics [0.00] 2009 e92 335 xdrive [0.00]	hpfp __________________ 2007 335 coupe Alpine white, steptronic, sportpack, etc. (gone) 2006 X3 3.0 steptronic Titanium Silver, 2009 E92 335xdrive, next.... Caddy CTS_V! 13 Lincoln MKZ? hmmm.
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05-30-2014, 09:13 AM	#8
norsairius Foodie and Gearhead 102 Rep 733 Posts Drives: 2011 335i xDrive Sedan Join Date: Mar 2013 Location: MN iTrader: (0) Garage List 2011 BMW 335i xDriv ... [9.50]	Could be a gummed up injector, a bad coil pack, bad spark plug, or it could be fixed with a DME update. My car had a rough idle here and there. The dealership performed SIB 12-21-12 (which I've not been able to find details for) and it seemed to get better. It still happens from time to time, but not as frequently and it smooths out more quickly if it does come up. Good luck! __________________ 2011 335i xDrive Sedan, Deep Sea Blue w/Oyster Interior
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05-30-2014, 11:43 AM	#9
X_Drive Second Lieutenant 8 Rep 263 Posts Drives: E46, E91, F21 Join Date: Apr 2014 Location: Northwest iTrader: (0) Garage List 2017 M140i LCI [0.00] 2005 E46 325xi [0.00] 2011 E91 328i xDriv ... [0.00]	Check your eccentric shaft sensor connector. See if you have oil residue in it. It's a free and easy check and at least you can check that box off the list.
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05-31-2014, 03:05 PM	#12
Austin 1439 President 7 Rep 239 Posts Drives: e92 Coupe Crimson Red Join Date: Apr 2013 Location: Arkansas iTrader: (0) Garage List 2011 Mercedes-Benz ... [0.00] 2009 Posche Cayenne S [0.00] 2000 BMW 323CI [0.00] 2007 BMW 328xi Coupe [0.00]	I think I have it narrowed down to the eccentric shaft sensor. It had oil in it when we did the VCG and we didnt think anything of it. I guess thats probably it.
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