RPM Needle Wiggle at Idle?

DrDurt · 03-08-2012, 09:07 PM

Anyone else get slight movement in their RPM needle while it is working its way down to the 600rpm idle, and while it is there? Its pretty minimal, maybe up to 650/700. The engine doesn't seem rough and everything appears normal. I have just noticed and have been obsessing over it, by the way, the car has 50k and hasn't had to go in for any previous engine work.

Any input would be appreciated, thanks.

PS- Also happens when engine is warm.

EngineCo52 · 03-08-2012, 11:55 PM

pretty sure thats normal...MT??

AWD Addict · 03-08-2012, 11:58 PM

No occasional little shake?

http://www.e90post.com/forums/showthread.php?t=509274

DrDurt · 03-09-2012, 09:47 PM

Quote:

Originally Posted by EngineCo52

pretty sure thats normal...MT??

No its AT

DrDurt · 03-09-2012, 09:48 PM

Quote:

Originally Posted by AWD Addict

No occasional little shake?

http://www.e90post.com/forums/showthread.php?t=509274

I read your thread on this, the car doesn't feel rough or sound any different. Just needle movement

blackbeast06 · 03-10-2012, 12:05 AM

my car does the same at idle, the tach does seem to fluctuate about 100rpm here and there. i think it has something to do with the electronics controlling the very low idle to conserve gas (i think i had read that somewhere).

mh666 · 03-13-2012, 06:36 PM

My car has the same problem, except that the engine jerks and shakes/vibrates on top of the rpm wiggle..... still having the same problem after 6 spark plugs+coils change......

GoRomeo · 03-13-2012, 06:48 PM

Quote:

Originally Posted by mh666

My car has the same problem, except that the engine jerks and shakes/vibrates on top of the rpm wiggle..... still having the same problem after 6 spark plugs+coils change......

completely normal. I ve seen this since I bought my car in 06. If is shakes at times then there could be an issue with fuel injectors...or something. Just my two cents...

_Ryan_ · 03-14-2012, 04:41 PM

For the AT: does it do it only in drive, or in neutral to?

merchomini · 03-14-2012, 04:56 PM

probably just the way it idles like someone else said to cut fuel as little as possible, occasionally it proably has top bump in more fuel to keep it running.....iv never noticed mine but i never pay attention to my tach so...doesnt sound like tis a real problem tho...?

DrDurt · 03-14-2012, 09:52 PM

Quote:

Originally Posted by _Ryan_

For the AT: does it do it only in drive, or in neutral to?

not sure, ill check it out. Ive gotta go get an alignment before I put my summer wheels on, so Ill bring it up to my SA

cisf0rcalvin · 03-14-2012, 11:19 PM

Quote:

Originally Posted by _Ryan_

For the AT: does it do it only in drive, or in neutral to?

Mine does this when I put it into DS at a stop and shift into M1 with a cold engine. After moving and coming to another stop it is fine. Service could not find any stored codes so they didn't think much.

jvsxn · 03-15-2012, 05:11 AM

It's fairly normal. My car idles a little below 700 so I guess I fall into the range you stated. As long as your car isn't jerking and the needle isn't blipping up and down, you should be good.

_Ryan_ · 03-17-2012, 01:16 AM

It's normal for an auto in gear in my experience. Neutral sounds like the idle is a tad to low, hence asking you to check.

-R

BoogeyMan'sBMW · 07-05-2012, 12:40 PM

Quote:

Originally Posted by mh666

My car has the same problem, except that the engine jerks and shakes/vibrates on top of the rpm wiggle..... still having the same problem after 6 spark plugs+coils change......

Quote:

Originally Posted by GoRomeo

completely normal. I ve seen this since I bought my car in 06. If is shakes at times then there could be an issue with fuel injectors...or something. Just my two cents...

Quote:

Originally Posted by JT_Munkey

It's fairly normal. My car idles a little below 700 so I guess I fall into the range you stated. As long as your car isn't jerking and the needle isn't blipping up and down, you should be good.

my car is doing this as well and its driving me crazy. the car sputters, so to speak, while i am stopped at a red light or something and the needle wiggles. the best way to describe this sputtering phenomenon is basically the same way the car reacts when you switch from N to D.

mh666, did you fix your problem? it sounds like we have the same issue. romeo and munkey, what are your thoughts/recommendations? thanks!

GoRomeo · 07-05-2012, 12:46 PM

Quote:

Originally Posted by BoogeyMan'sBMW

my car is doing this as well and its driving me crazy. the car sputters, so to speak, while i am stopped at a red light or something and the needle wiggles. the best way to describe this sputtering phenomenon is basically the same way the car reacts when you switch from N to D.

mh666, did you fix your problem? it sounds like we have the same issue. romeo and munkey, what are your thoughts/recommendations? thanks!

I would try the TECHRON injector cleaner first which is the lowest cost option. Also try different octane gas maybe? Keep us posted.

Torobimmer · 07-05-2012, 12:47 PM

no Holiday Inn Express here but he's a legit BMW.

sub to his channel.

GoRomeo · 07-05-2012, 12:53 PM

Quote:

Originally Posted by tororosso1

sub to his channel.

Did you buy new Vanos solenoids> I ve heard you can also swap them out..
Great video. Thanks!

BoogeyMan'sBMW · 07-05-2012, 01:56 PM

Quote:

Originally Posted by GoRomeo

I would try the TECHRON injector cleaner first which is the lowest cost option. Also try different octane gas maybe? Keep us posted.

ive done both. i regularly use techron and the problem seemed to go away while i was on the tank of gas with the techron, but it came back next tank. i also swirched from using bp 89 to shell vpower 93

problem still exists

froz_v · 07-06-2012, 03:10 AM

Quote:

Originally Posted by tororosso1

Ive got the exact same fluctuations does anybody know how to get this fixed? it started to fluctuate after I got the updated valve lifters to get rid of the knocking sound. My car is a 08 328xi currently 83,000kms about 52000mls and I've used shell 91 vpower (highest grade fuel we got in canada) since day 1

03-08-2012, 09:07 PM	#1
DrDurt Lieutenant 30 Rep 519 Posts Drives: e90 325xi Join Date: Mar 2010 Location: BaskingRidge, NJ iTrader: (3)	RPM Needle Wiggle at Idle? Anyone else get slight movement in their RPM needle while it is working its way down to the 600rpm idle, and while it is there? Its pretty minimal, maybe up to 650/700. The engine doesn't seem rough and everything appears normal. I have just noticed and have been obsessing over it, by the way, the car has 50k and hasn't had to go in for any previous engine work. Any input would be appreciated, thanks. PS- Also happens when engine is warm.
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03-08-2012, 11:55 PM	#2
EngineCo52 Major 60 Rep 1,457 Posts Drives: 2007 Montego 328xi CPE Join Date: May 2011 Location: Havre de Grace, MD iTrader: (2)	pretty sure thats normal...MT?? __________________ E92 328xi Mods-KW V1-BMW Performance Exhaust-Matte Black Grill-CF Mirror Covers-CF B-Pillars-20% Tint-Coming soon:AG M310's, M3 Rep Front, Black Roof, Vinyl Window Trim E9x Picture Game-8 Points-Roundabout, Something Remarkable(stack of 50 g's), Cruise Memorabilia, Dirt Road w/ Trees, Michael Jackson, Police Station ,Dress-Up Funny, TPMS
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03-08-2012, 11:58 PM	#3
AWD Addict Chief Executive 300 Rep 2,886 Posts Drives: 2008 335xi 6spd Coupe Join Date: Dec 2007 Location: Boston iTrader: (1) Garage List 2008 335xi [0.00]	No occasional little shake? http://www.e90post.com/forums/showthread.php?t=509274
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03-10-2012, 12:05 AM	#6
blackbeast06 adrenergic stimulation 45 Rep 405 Posts Drives: 2019 M4cs San Marino Blue Join Date: Dec 2009 Location: Columbus iTrader: (4) Garage List 2006 325i [0.00]	my car does the same at idle, the tach does seem to fluctuate about 100rpm here and there. i think it has something to do with the electronics controlling the very low idle to conserve gas (i think i had read that somewhere). __________________ 2015 M4 Mineral White/Sakhir Orange 6MT Retired 2007 335i Montego Blue/Saddle Brown 6 MT Retired 2006 325i Black/Black 6MT [IMG]m4 by senntera, on Flickr[/IMG]
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03-13-2012, 06:36 PM	#7
mh666 Private First Class 3 Rep 173 Posts Drives: AW E90 Join Date: May 2009 Location: Vancouver, BC iTrader: (3)	My car has the same problem, except that the engine jerks and shakes/vibrates on top of the rpm wiggle..... still having the same problem after 6 spark plugs+coils change......
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03-14-2012, 04:41 PM	#9
_Ryan_ Captain 59 Rep 741 Posts Drives: E87 130i Join Date: Jan 2012 Location: Melbourne, AU iTrader: (0) Garage List 2005 BMW 130i [5.24]	For the AT: does it do it only in drive, or in neutral to?
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03-14-2012, 04:56 PM	#10
merchomini Captain 19 Rep 790 Posts Drives: 2011 Touareg VR6 Join Date: Apr 2011 Location: MidWest iTrader: (0)	probably just the way it idles like someone else said to cut fuel as little as possible, occasionally it proably has top bump in more fuel to keep it running.....iv never noticed mine but i never pay attention to my tach so...doesnt sound like tis a real problem tho...? __________________ 2011 Volkswagon Touareg - Current 2005 Evolution 8 FBO E-85 365whp - Sold 2009 135i Alpine White/Terracotta 6mt - Sold 2009 BSM lci e90 335i 6mt xdrive - Sold
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03-15-2012, 05:11 AM	#13
jvsxn Lieutenant Colonel 101 Rep 1,727 Posts Drives: e-ninety Join Date: Jul 2011 Location: San Jose, CA iTrader: (8)	It's fairly normal. My car idles a little below 700 so I guess I fall into the range you stated. As long as your car isn't jerking and the needle isn't blipping up and down, you should be good. __________________ Hiatus
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03-17-2012, 01:16 AM	#14
_Ryan_ Captain 59 Rep 741 Posts Drives: E87 130i Join Date: Jan 2012 Location: Melbourne, AU iTrader: (0) Garage List 2005 BMW 130i [5.24]	It's normal for an auto in gear in my experience. Neutral sounds like the idle is a tad to low, hence asking you to check. -R
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07-05-2012, 12:47 PM	#17
Torobimmer Private First Class 43 Rep 172 Posts Drives: e90 Pre-LCI prem+sport 6mt Join Date: Jun 2012 Location: Bay Area, CA iTrader: (0)	subscribe to this youtube channel no Holiday Inn Express here but he's a legit BMW. sub to his channel. Last edited by Torobimmer; 07-05-2012 at 12:56 PM..
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