E90Post
 


ECS BMW
 
BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > General E90 Sedan / E91 Wagon / E92 Coupe / E93 Cabrio > idle surge/vibration with AC on



Reply
 
Thread Tools Search this Thread
      06-29-2009, 01:29 AM   #1
billgti
Lieutenant
9
Rep
506
Posts

 
Drives: 06 BMW 330i
Join Date: Jul 2005
Location: Los Angeles, CA

iTrader: (0)

idle surge/vibration with AC on

with the car in drive (e.g. stopped at a traffic light) and with the AC on, the idle surges by a couple hundred rpm and the car shakes very noticeabley. happens every 5-10 seconds or so. gets worse with the AC cranked up to max. doesn't happen when the AC is off.

what's going on here? Idle control valve? give me some ideas guys. thanks.
Appreciate 0
      06-29-2009, 01:31 AM   #2
persian54
Lieutenant General
persian54's Avatar
United_States
285
Rep
15,812
Posts

 
Drives: SL550. Prev: E93 M3/335i/Z435i
Join Date: Jun 2009
Location: The Valley, SoCal

iTrader: (291)

if you find out... let me know...
Appreciate 0
      06-29-2009, 12:01 PM   #3
billgti
Lieutenant
9
Rep
506
Posts

 
Drives: 06 BMW 330i
Join Date: Jul 2005
Location: Los Angeles, CA

iTrader: (0)

any ideas?
Appreciate 0
      06-29-2009, 03:03 PM   #4
sbux
First Lieutenant
sbux's Avatar
7
Rep
343
Posts

 
Drives: 330i 06
Join Date: Apr 2009
Location: NY

iTrader: (0)

emission control failure ?
Appreciate 0
      06-29-2009, 03:07 PM   #5
ragingclue
One cam is enough
ragingclue's Avatar
87
Rep
6,815
Posts

 
Drives: VF
Join Date: Oct 2008
Location: mulletville

iTrader: (1)

Yeah if you find out, let me know too.
Appreciate 0
      06-29-2009, 06:48 PM   #6
mtkid
First Lieutenant
mtkid's Avatar
United_States
7
Rep
387
Posts

 
Drives: None
Join Date: Dec 2006
Location: California

iTrader: (0)

Garage List
2006 325i  [0.00]
Send a message via AIM to mtkid
I also have this problem
__________________
mods to come: koni yellows. camber kit. matte black m6 reps. mtec cf spoiler
Appreciate 0
      06-30-2009, 07:07 AM   #7
hotnikks
Private First Class
hotnikks's Avatar
United_States
1
Rep
142
Posts

 
Drives: E90 330 6MT
Join Date: May 2009
Location: NY/NJ

iTrader: (1)

Damn alot of people have this and no one knows... I may be experiencing this also not sure. Subscribed
__________________
Appreciate 0
      06-30-2009, 08:34 AM   #8
Potty_Pants
Colonel
Potty_Pants's Avatar
United_States
28
Rep
2,191
Posts

 
Drives: 2012 Genesis Sedan Rspec
Join Date: Apr 2007
Location: Southern NJ

iTrader: (0)

ac compressor restrictions... ?

could the compressor be failing and providing abnormal restrictrion on the belts ?


ppp
__________________
Olds Starfire > Chevy Malibu > Isuzu I-mark RS & Honda Magna 500 > Grand Am GT & YSR50 > Nissan Maxima & Ninja 750 > X-Wife > Hyundai Excel > Honda Prelude > Honda Accord > Honda Prelude & Ninja 250> Infiniti G35 > E90 335i > Hyundai Genesis Rspec, Hyunadai Sonata > Kia Sorento > Honda CRV-EX
Appreciate 0
      06-30-2009, 08:52 AM   #9
ragingclue
One cam is enough
ragingclue's Avatar
87
Rep
6,815
Posts

 
Drives: VF
Join Date: Oct 2008
Location: mulletville

iTrader: (1)

I know there should be a normal slightly noticeable change when the compressor clutch is engaging/disengaging, or is that only on older cars? Anyway, the fluctuations are too close together to be this, as the duration of that cycle should be pretty long. Overall, I'm just not too impressed with the time it takes to get up to temp (or down to temp), or its effectiveness.
Appreciate 0
      06-30-2009, 07:48 PM   #10
billgti
Lieutenant
9
Rep
506
Posts

 
Drives: 06 BMW 330i
Join Date: Jul 2005
Location: Los Angeles, CA

iTrader: (0)

i know the ac compressor adds extra load and can therefore cause slight vibrations but what happens with my car is that there's a sharp jolt every 10 seconds or so...so much so that it actually jolts the car forward if i don't have my foot firmly on the brake pedal.
Appreciate 0
      06-30-2009, 07:54 PM   #11
ak335
Lieutenant Colonel
ak335's Avatar
43
Rep
1,566
Posts

 
Drives: Cayman S
Join Date: Jun 2008
Location: Northern Va

iTrader: (3)

Happens to me too
Appreciate 0
      07-02-2009, 01:07 AM   #12
billgti
Lieutenant
9
Rep
506
Posts

 
Drives: 06 BMW 330i
Join Date: Jul 2005
Location: Los Angeles, CA

iTrader: (0)

Quote:
Originally Posted by Potty_Pants View Post
ac compressor restrictions... ?

could the compressor be failing and providing abnormal restrictrion on the belts ?


ppp
the compressor itself should be fine since the ac blows cold still. maybe something is wrong with how the ac clutch engages or idle air control valve?
Appreciate 0
      07-02-2009, 01:47 AM   #13
bsamoul
Major General
bsamoul's Avatar
No_Country
78
Rep
7,426
Posts

 
Drives: E90 325i
Join Date: Feb 2007
Location: Walnut Creek, California

iTrader: (2)

Send a message via AIM to bsamoul
It seems to me that with the AC on, it will inevitably make your RPM go up because the alternator has to supply enough power to it, and when your RPM goes up, you will start to move, just like when you hit the gas. So I believe that it is completely normal for that to happen.
__________________
-Brian
2X 2006 BMW 325i [Electric Red & Mystic Blue] | ZPP | V1 | Rear Fogs | M3 Lip Spoiler | EAS RemoteKey | BMS Powerbox | Projector90 Headlights w/ LED AE | LED plate lights | OEM Blacklines
http://www.tech-shine.com
Appreciate 0
      07-02-2009, 09:08 AM   #14
ragingclue
One cam is enough
ragingclue's Avatar
87
Rep
6,815
Posts

 
Drives: VF
Join Date: Oct 2008
Location: mulletville

iTrader: (1)

Quote:
Originally Posted by billgti View Post
i know the ac compressor adds extra load and can therefore cause slight vibrations but what happens with my car is that there's a sharp jolt every 10 seconds or so...so much so that it actually jolts the car forward if i don't have my foot firmly on the brake pedal.
You would think that would more likely be related to the transmission. Odd. Maybe your compressor is running incredibly inefficiently and your engine has to overcompensate?
Appreciate 0
      07-02-2009, 09:16 AM   #15
clairvoyant
Major
clairvoyant's Avatar
No_Country
17
Rep
1,033
Posts

 
Drives: Bavarian Manure Wagon (BMW)
Join Date: Oct 2007
Location: 4519′20″N, 7550′0″W

iTrader: (5)

Garage List
2007 335i  [2.62]
Question

check for vacuum leaks first ... clean the MAF, and IAC valve, check/replace airfilter....

as said before, it COULD be the beginnings of VANOS seals failure ... you can unplug the intake side vanos solenoid and if the problem stops, then that is likely your cause...

do you have any cold startup idle issues?

Quote:
Originally Posted by billgti View Post
with the car in drive (e.g. stopped at a traffic light) and with the AC on, the idle surges by a couple hundred rpm and the car shakes very noticeabley. happens every 5-10 seconds or so. gets worse with the AC cranked up to max. doesn't happen when the AC is off.

what's going on here? Idle control valve? give me some ideas guys. thanks.
Appreciate 0
      07-02-2009, 01:37 PM   #16
Wires
Captain
9
Rep
937
Posts

 
Drives: 335xi
Join Date: Apr 2008
Location: Calgary

iTrader: (0)

I believe it's normal. At idle, they lean out the engine for maximum efficiency. During that time, power output is lower, and the engine is less forgiving to changes in engine load (aka A/C compressor suddenly snapping on).

My GM vehicles do the same.
Appreciate 0
      07-02-2009, 01:52 PM   #17
phxducwi
Registered
0
Rep
1
Posts

 
Drives: 2007 328i coupe
Join Date: Jun 2009
Location: Az

iTrader: (0)

I have the exact issue as billgti. it also improves a little with the a/c off but this is not just the slight change when the compressor kicks on, its more like a classic car with cams. a little bit of a shake...
I wish i knew because my car is out of warranty so i am trying to avoid the stealer. The vibration goes away as soon as your foot is on the gas.

hopefully someone will chime in that has gone through this before.
Appreciate 0
      07-02-2009, 06:30 PM   #18
Wires
Captain
9
Rep
937
Posts

 
Drives: 335xi
Join Date: Apr 2008
Location: Calgary

iTrader: (0)

This is normal. In the "olden days" of like the '80's The car idled a lot higher (1300-1500RPM). With the closed loop EFI, it's now in that 500-700 RPM range. My GMC truck stutters when idling as well, and so does my BMW.....
Appreciate 0
      07-03-2009, 12:58 AM   #19
sofaonasock
Private
sofaonasock's Avatar
United_States
1
Rep
98
Posts

 
Drives: '09 Nissan 370Z Touring 6MT
Join Date: Mar 2008
Location: Bay Area, CA

iTrader: (0)

Send a message via AIM to sofaonasock
Quote:
Originally Posted by billgti View Post
with the car in drive (e.g. stopped at a traffic light) and with the AC on, the idle surges by a couple hundred rpm and the car shakes very noticeabley. happens every 5-10 seconds or so. gets worse with the AC cranked up to max. doesn't happen when the AC is off.

what's going on here? Idle control valve? give me some ideas guys. thanks.
+1
Appreciate 0
      07-06-2009, 12:25 PM   #20
billgti
Lieutenant
9
Rep
506
Posts

 
Drives: 06 BMW 330i
Join Date: Jul 2005
Location: Los Angeles, CA

iTrader: (0)

Quote:
Originally Posted by clairvoyant View Post
check for vacuum leaks first ... clean the MAF, and IAC valve, check/replace airfilter....

as said before, it COULD be the beginnings of VANOS seals failure ... you can unplug the intake side vanos solenoid and if the problem stops, then that is likely your cause...

do you have any cold startup idle issues?
thanks for your insight.

no cold startup issues. with the ac off, the idle is rock solid at around 600 rpm. with the ac on (and it gets worse with the fan speed turned higher, i.e. worse at with max a/c) the car occassionally jolts and i can see the rpms bounce up by a couple hundred rpm when idling at a traffic light.

i understand that it's normal to feel a slight vibration and see a slightly higher rpm with the AC on, but what i'm experiencing is a very obvious shake that occurs intermittently.
Appreciate 0
      07-06-2009, 12:30 PM   #21
ragingclue
One cam is enough
ragingclue's Avatar
87
Rep
6,815
Posts

 
Drives: VF
Join Date: Oct 2008
Location: mulletville

iTrader: (1)

I'm getting unusual fluctuation of blower speed while it's on. It'll stop pushing air momentarily.
Appreciate 0
      09-08-2009, 05:03 PM   #22
billgti
Lieutenant
9
Rep
506
Posts

 
Drives: 06 BMW 330i
Join Date: Jul 2005
Location: Los Angeles, CA

iTrader: (0)

just in case any of u were still looking for a solution to this...

i took my car to a local bmw shop this week and the tech found the spark plugs to be in bad condition so i had all six of them replaced. the jolt at idle is completely gone at both stop lights with or without AC. so for anyone experiencing similar symptoms (my car had about 58k miles when it started to do this), check your spark plugs.
Appreciate 0
Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -5. The time now is 07:24 AM.




e90post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST