Rough startup, loss of power. What could it be?

RingBredE90 · 05-23-2013, 07:10 PM

Hello,
First off my car is a 2006 330i and my only mod is the autowerks tune. I got the tune about 6 months ago and the car has been running fine so im not sure if this has anything to do with it.

Today when i tried to start the car i it cranked a bit longer than usual and once it fired up its as if it started choking. The rpms were going up and down and the car was shaking, to the point where it was about to shut off. It eventually started running smoothly but i noticed a loss of power when trying to accelerate a bit harder.

Im not sure what the issue is. I have done all the maintenance including new spark plugs last year. Any thoughts?

JDane07 · 05-23-2013, 07:43 PM

Probably a misfire of some sort?
Have you had any ignition coils or spark plugs switched out recently?

I had a big loss of power and a very bumpy acceleration when one of my ignition coils went out.

Wrngway · 05-23-2013, 07:44 PM

Any warning lights/messages?

Ben0426 · 05-23-2013, 08:55 PM

Sounds like misfire to me. I had similar issue before tuned out to be bad spark plug. Get them check first.

RingBredE90 · 05-23-2013, 09:54 PM

Thanks guys, i had my spark plugs replaced but that was over 6 months ago. I have no error/ warning messages, except for one of my light bulbs. This happened once a few weeks ago then it was fine, then again today, so it only happens occasionally.

Johnny D · 05-23-2013, 11:03 PM

RingBredE90 · 05-24-2013, 12:56 PM

Thanks Johnny D....il check this out on my car.

McAuley7 · 05-24-2013, 02:45 PM

Does it happen every start up?

RingBredE90 · 05-24-2013, 04:59 PM

Quote:

Originally Posted by Sonic777

Does it happen every start up?

No this is only the 3rd time in the last 3-4 months.

e90pilot · 05-24-2013, 06:03 PM

Have you had the car scanned anyways? Sometimes an error won't trigger a SES light.

ska///235i · 05-24-2013, 07:53 PM

the eccentric sensor

Beamin · 05-25-2013, 01:34 AM

How do you like the tune? How much of a difference do you feel from stock?

McAuley7 · 05-25-2013, 08:03 AM

WHat you got 75k on it?

nate5ks · 05-26-2013, 06:16 AM

Check spark plug grounds then scan for codes. Probably the crank sensor, I had the exact same problem with my car last year.

RingBredE90 · 05-26-2013, 09:14 PM

Well it has not happened since, so i will ride it out and see if it happens again. Thanks for all the feedback guys.

hugo330i · 05-26-2013, 10:47 PM

Did you got the coils replaced when spark plugs job was done?

If not, it may be a coil malfunction

SDemetris · 05-26-2013, 11:01 PM

maybe sometimes one of your disa valves gets stuck? Kind of a guess but they dont throw codes, it might not happen all the time and that causes rough idle

BoogeyMan'sBMW · 05-28-2013, 08:47 AM

If I were you, I would get the car scanned by someone who knows their way around these cars and has the proper software.

I had similar problems a few months back and I heard so many different things including that I need walnut shell blasting, it was the eccentric shaft, MAF sensor problem, and solenoids just to name some.

You know what it was? A coil on its way out. Although thats what I had suspected originally, all this other stuff corrupted my virgin mind. Start simple, if you changed plugs 6 months ago I would change all the coils as well.

Martin from MNC Performance (a master BMW tech) here in NYC diagnosed this problem in a matter of 30 seconds after hooking my car up and looking at some details about how the car was running due to the lack of codes being thrown.

Good luck!

05-23-2013, 07:10 PM	#1
RingBredE90 DTMRacer 36 Rep 215 Posts Drives: E90 330I Join Date: Dec 2011 Location: Stoney Lake, ON iTrader: (0)	Rough startup, loss of power. What could it be? Hello, First off my car is a 2006 330i and my only mod is the autowerks tune. I got the tune about 6 months ago and the car has been running fine so im not sure if this has anything to do with it. Today when i tried to start the car i it cranked a bit longer than usual and once it fired up its as if it started choking. The rpms were going up and down and the car was shaking, to the point where it was about to shut off. It eventually started running smoothly but i noticed a loss of power when trying to accelerate a bit harder. Im not sure what the issue is. I have done all the maintenance including new spark plugs last year. Any thoughts? __________________
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05-23-2013, 07:43 PM	#2
JDane07 Lieutenant Colonel 143 Rep 1,720 Posts Drives: 330i (sold), MK7 GTI Join Date: Nov 2011 Location: Napa, CA iTrader: (3)	Probably a misfire of some sort? Have you had any ignition coils or spark plugs switched out recently? I had a big loss of power and a very bumpy acceleration when one of my ignition coils went out. __________________ Current Ride: '16 MK7 GTI// Former Ride: '06 E90 330i// Don't mind me... just passing along// Old E90 Thread: http://www.e90post.com/forums/showth...first+e90+m580
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05-23-2013, 07:44 PM	#3
Wrngway Lieutenant 31 Rep 393 Posts Drives: '11 328i Sedan A6 Join Date: Jul 2011 Location: D.C. Metro iTrader: (1)	Any warning lights/messages?
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05-23-2013, 08:55 PM	#4
Ben0426 First Lieutenant 20 Rep 302 Posts Drives: e92 325i /RR Sport Join Date: Nov 2011 Location: Sydney iTrader: (1)	Sounds like misfire to me. I had similar issue before tuned out to be bad spark plug. Get them check first.
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05-23-2013, 09:54 PM	#5
RingBredE90 DTMRacer 36 Rep 215 Posts Drives: E90 330I Join Date: Dec 2011 Location: Stoney Lake, ON iTrader: (0)	Thanks guys, i had my spark plugs replaced but that was over 6 months ago. I have no error/ warning messages, except for one of my light bulbs. This happened once a few weeks ago then it was fine, then again today, so it only happens occasionally. __________________
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05-23-2013, 11:03 PM	#6
Johnny D Major 64 Rep 1,087 Posts Drives: 2006 BMW 325i Join Date: Apr 2011 Location: Hot Springs, AR iTrader: (4) Garage List 2006 BMW 325i [9.16]	__________________
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05-24-2013, 12:56 PM	#7
RingBredE90 DTMRacer 36 Rep 215 Posts Drives: E90 330I Join Date: Dec 2011 Location: Stoney Lake, ON iTrader: (0)	Thanks Johnny D....il check this out on my car. __________________
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05-24-2013, 02:45 PM	#8
McAuley7 @McAuley7 11 Rep 419 Posts Drives: 2010 335i Join Date: Apr 2013 Location: Florida iTrader: (0) Garage List 2010 335i [9.00]	Does it happen every start up?
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05-24-2013, 06:03 PM	#10
e90pilot Freight Dawg 104 Rep 2,103 Posts Drives: E90 325i Join Date: Jul 2005 Location: Oakland, CA iTrader: (3)	Have you had the car scanned anyways? Sometimes an error won't trigger a SES light. __________________ --Marcelo '06 Arctic Metallic 325i \| Sport Package \| 6MT \| Dinan Stage III suspension \| Dinan exhaust \| 330i manifold swap! Click here! \| Active Autowerke tune \| 135i Brake Calipers \| Deiselboost caliper brackets \| E46 M3 front rotors
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05-24-2013, 07:53 PM	#11
ska///235i ***** noob 1369 Rep 10,479 Posts Drives: 325xi>M235i>428GCx Mspor Join Date: Sep 2005 Location: Boston iTrader: (34) Garage List 2006 325xi [0.00]	the eccentric sensor __________________ 2006 325xi (Sold) 2014 M235I (Current) 2015 428xi Gran Coupe (STB)
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05-25-2013, 01:34 AM	#12
Beamin Private First Class 10 Rep 114 Posts Drives: Black 06 330i Sport Join Date: Apr 2012 Location: Tallahassee iTrader: (0)	How do you like the tune? How much of a difference do you feel from stock?
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05-25-2013, 08:03 AM	#13
McAuley7 @McAuley7 11 Rep 419 Posts Drives: 2010 335i Join Date: Apr 2013 Location: Florida iTrader: (0) Garage List 2010 335i [9.00]	WHat you got 75k on it?
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05-26-2013, 06:16 AM	#14
nate5ks Captain 33 Rep 648 Posts Drives: 2006 BMW 330xi Join Date: Nov 2011 Location: Jacksonville Beach, FL iTrader: (0)	Check spark plug grounds then scan for codes. Probably the crank sensor, I had the exact same problem with my car last year.
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05-26-2013, 09:14 PM	#15
RingBredE90 DTMRacer 36 Rep 215 Posts Drives: E90 330I Join Date: Dec 2011 Location: Stoney Lake, ON iTrader: (0)	Well it has not happened since, so i will ride it out and see if it happens again. Thanks for all the feedback guys. __________________
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05-26-2013, 10:47 PM	#16
hugo330i Banned 69 Rep 173 Posts Drives: 330i Sedan Sparkiling Graphite Join Date: Sep 2007 Location: Orlando, FL iTrader: (6)	Did you got the coils replaced when spark plugs job was done? If not, it may be a coil malfunction
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05-26-2013, 11:01 PM	#17
SDemetris FSAE Dude 61 Rep 759 Posts Drives: E90 328xi Join Date: Jul 2012 Location: Pittsburgh, PA iTrader: (0)	maybe sometimes one of your disa valves gets stuck? Kind of a guess but they dont throw codes, it might not happen all the time and that causes rough idle __________________ 2007 TiAg 328xi: AA Tune, AFE intake, Full exhaust, 335xi Brakes, H&R RSB, UUC FSB, H&R Sports, Billy Sports...BBS SR 17x8 1985 Gazelle Beige 325e: Poly everything, e24 3.25 LSD, 225 lb weight reduction, Corbeau FX1, Shifter machined by me, roll bar, harness, all the other goodies. My "Racecar"...15x7 BBS RA
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05-28-2013, 08:47 AM	#18
BoogeyMan'sBMW Lieutenant Colonel 118 Rep 1,933 Posts Drives: SLOW Join Date: Jun 2009 Location: Queens NY iTrader: (4)	If I were you, I would get the car scanned by someone who knows their way around these cars and has the proper software. I had similar problems a few months back and I heard so many different things including that I need walnut shell blasting, it was the eccentric shaft, MAF sensor problem, and solenoids just to name some. You know what it was? A coil on its way out. Although thats what I had suspected originally, all this other stuff corrupted my virgin mind. Start simple, if you changed plugs 6 months ago I would change all the coils as well. Martin from MNC Performance (a master BMW tech) here in NYC diagnosed this problem in a matter of 30 seconds after hooking my car up and looking at some details about how the car was running due to the lack of codes being thrown. Good luck!
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