reduced power

mcd1427 · 08-27-2014, 10:24 PM

Has anyone experienced the car having a lot less power?
My m4 has 900 miles on it, and falls flat on it's face after 4k rpm. Not nearly the pull it had originally, it feels like the boost has been turned down.

MaynardZed · 08-27-2014, 11:16 PM

Your saying it has a lot less power than it did initially. If your sure this is not in your head, I'd take it in to be looked at. Mine has 400 miles on it and pulls hard up to 5500-6000rpm which were I shift for now until broken in.

04RC51 · 08-28-2014, 04:45 AM

Shift sooner in the sweet spot of the torque curve.

If you're coming from an E9X, you will need to learn to drive the car differently. You no longer have to rev the piss out of your car to get it to move.

CanAutM3 · 08-28-2014, 09:52 AM

Quote:

Originally Posted by 04RC51

Shift sooner in the sweet spot of the torque curve.

If you're coming from an E9X, you will need to learn to drive the car differently. You no longer have to rev the piss out of your car to get it to move.

The RPM needs to be kept above 5500RPM in the next gear to maximize acceleration, so you need to shift at or close to 7300RPM to maximize acceleration in third gear and up. Redline shifts are still required in 1st and second.

gthal · 08-28-2014, 10:29 PM

Some early cars had hoses bust that might cause this.

stressdoc · 08-29-2014, 04:53 PM

Yes -- similar to N54 issues. Have dealer check hose and hose clamps.

mcd1427 · 08-30-2014, 11:29 PM

I spoke to my service advisor... He suggested disconnecting the battery. I did this and the car feels completely normal again. Maybe it is all in my head 🌀

voodoogeek · 08-31-2014, 07:56 AM

Quote:

Originally Posted by mcd1427

I spoke to my service advisor... He suggested disconnecting the battery. I did this and the car feels completely normal again. Maybe it is all in my head 🌀

as a long-time computer geek, this sounds like some control unit required some sort of reset. or, it was all in your head. basically this describes my job for the last 20 years

mcd1427 · 09-01-2014, 01:46 PM

Sorry for taking up your time with trivial mental problems

Here is some AW love.

Taimur · 01-27-2015, 03:02 PM

Sorry to bump this up again. But ironically I just experienced the same reduced power issue. No CEL and my car is stock with 900 miles as well. I checked the I/C hoses and they look fine.

I know it's not in my head. The original poster said that disconnecting the battery fixed the issue. Wonder why that would fix it? I'm up for my service soon so will have the dealer check it. But I'm open to any ideas?

JLBADBTAB · 02-01-2015, 08:11 AM

One suggestion...I might have the service team check the turbo inlet pipe (tube). In addition to hoses that are not connected properly, a faulty turbo inlet tube could cause some of the reduced power issues. I've had some significant engine issues with my M4 (July build) which included overall sluggishness in addition to throwing off "lean mixture" fault codes. I've had several trips to the service department which included reconnecting the hoses, updating the software, replacing one (1) of the turbo inlet pipes and now we will be replacing the cylinder head and fuel pumps. In my particular situation, we really don't know yet what the root cause is relative to the fault codes and overall engine sluggishness BUT there are some things that you may want to have the service team look at during the diagnostic stage (i.e. hoses, turbo inlet pipes, fuel pumps, etc.) Hope this helps!

mcd1427 · 02-12-2015, 09:12 PM

Taimur,
Any luck? Mine has stopped this feeling for the most part, however sometimes I really do wonder why it feels like it's pulling like my old 335i. Sometimes when I get on it it really goes and other times it feels like it never hits full boost.

JLBAB, thanks for the input I am going to have them look into it next time the car is in.

I know my statement above is a little conjumbled.... In all honesty I've only put 1900 miles on the car in 7 months. Maybe I just need to get to drive the car to get a real fair assessment.

Thanks guys,

Matt

Taimur · 02-14-2015, 08:39 AM

Matt,
I haven't taken it for service yet. The snow in the north east is not helping. Will post back here once completed.

Wei718 · 02-14-2015, 10:25 AM

After you guys pull your battery for a reset, drive your car hard to let the Ecu relearn your driving style.

GOLFFRR · 02-14-2015, 12:19 PM

could be way off but are you driving with MSD on (or whatever the initials are)? It could be the wheels are slipping and the car is cutting the power? I know when I drive with it off the car is a totally different animal. With it on it kills the power frequently

could be way off!! just throwing it out there

08-27-2014, 10:24 PM	#1
mcd1427 New Member 2 Rep 16 Posts Drives: 2015 BMW M4 Join Date: Jul 2014 Location: Pennsylvania iTrader: (0)	reduced power Has anyone experienced the car having a lot less power? My m4 has 900 miles on it, and falls flat on it's face after 4k rpm. Not nearly the pull it had originally, it feels like the boost has been turned down.
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08-27-2014, 11:16 PM	#2
MaynardZed Lieutenant Colonel 1231 Rep 1,789 Posts Drives: wife crazy Join Date: Jul 2014 Location: Phoenix iTrader: (0) Garage List 2019 Ford Raptor [0.00] 2016 Porsche 991.1 ... [0.00] 1987 Chevy Camaro I ... [0.00] 1972 Chevy Corvette [0.00] 1999 BMW M3 race car [0.00]	Your saying it has a lot less power than it did initially. If your sure this is not in your head, I'd take it in to be looked at. Mine has 400 miles on it and pulls hard up to 5500-6000rpm which were I shift for now until broken in. __________________ Road course laptimes for BMW M4 2015 6MT WHP East Track: 1:04.880, Arizona Motorsports Park: 1:54.352 Road course laptimes for Porsche 911 991.1 GTS 7MT WHP East Track: 1:02.770, Arizona Motorsports Park: 1:48.889
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08-28-2014, 04:45 AM	#3
04RC51 Large Member 951 Rep 1,749 Posts Drives: E92 M3, F82 M4 Join Date: May 2008 Location: NYC iTrader: (1)	Shift sooner in the sweet spot of the torque curve. If you're coming from an E9X, you will need to learn to drive the car differently. You no longer have to rev the piss out of your car to get it to move. __________________ 2008 E92 M3 (Engine swap completed), 2015 F82 M4
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08-28-2014, 10:29 PM	#5
gthal Major General 1903 Rep 5,678 Posts Drives: 2018 340i xDrive Join Date: Jul 2007 Location: Canada iTrader: (2)	Some early cars had hoses bust that might cause this. __________________ 2020 X3 M40i \| Black \| Current DD 2020 C8 Corvette \| Z51 \| Torch Red ... built and waiting for delivery 2016 M2 \| Long Beach Blue \| 6MT 2015 M4 \| Austin Yellow \| DCT 2012 MB C63AMG \| 2011 E92 M3 \| 2010 E92 M3
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08-29-2014, 04:53 PM	#6
stressdoc Moderator 617 Rep 10,855 Posts Drives: BMW i8; Toy 4runner TRD pro Join Date: Jun 2005 Location: Waco TX iTrader: (0)	Yes -- similar to N54 issues. Have dealer check hose and hose clamps. __________________ My recent ED photos: http://f80.bimmerpost.com/forums/sho....php?t=1026808 my not-so-recent ED: http://www.e90post.com/forums/showthread.php?t=31829 Please join BMWCCA http://bmwcca.org/index.php?pageid=c...&ref_by=300279
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08-30-2014, 11:29 PM	#7
mcd1427 New Member 2 Rep 16 Posts Drives: 2015 BMW M4 Join Date: Jul 2014 Location: Pennsylvania iTrader: (0)	I spoke to my service advisor... He suggested disconnecting the battery. I did this and the car feels completely normal again. Maybe it is all in my head 🌀
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09-01-2014, 01:46 PM	#9
mcd1427 New Member 2 Rep 16 Posts Drives: 2015 BMW M4 Join Date: Jul 2014 Location: Pennsylvania iTrader: (0)	Sorry for taking up your time with trivial mental problems Here is some AW love. Attached Images
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01-27-2015, 03:02 PM	#10
Taimur Second Lieutenant 21 Rep 270 Posts Drives: '15 M3 Join Date: May 2007 Location: Long Island, NY iTrader: (0)	Sorry to bump this up again. But ironically I just experienced the same reduced power issue. No CEL and my car is stock with 900 miles as well. I checked the I/C hoses and they look fine. I know it's not in my head. The original poster said that disconnecting the battery fixed the issue. Wonder why that would fix it? I'm up for my service soon so will have the dealer check it. But I'm open to any ideas?
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02-01-2015, 08:11 AM	#11
JLBADBTAB New Member 5 Rep 7 Posts Drives: 2014 BMW M6 Join Date: Jan 2014 Location: Issaquah iTrader: (0)	Reduced Power One suggestion...I might have the service team check the turbo inlet pipe (tube). In addition to hoses that are not connected properly, a faulty turbo inlet tube could cause some of the reduced power issues. I've had some significant engine issues with my M4 (July build) which included overall sluggishness in addition to throwing off "lean mixture" fault codes. I've had several trips to the service department which included reconnecting the hoses, updating the software, replacing one (1) of the turbo inlet pipes and now we will be replacing the cylinder head and fuel pumps. In my particular situation, we really don't know yet what the root cause is relative to the fault codes and overall engine sluggishness BUT there are some things that you may want to have the service team look at during the diagnostic stage (i.e. hoses, turbo inlet pipes, fuel pumps, etc.) Hope this helps!
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02-12-2015, 09:12 PM	#12
mcd1427 New Member 2 Rep 16 Posts Drives: 2015 BMW M4 Join Date: Jul 2014 Location: Pennsylvania iTrader: (0)	Taimur, Any luck? Mine has stopped this feeling for the most part, however sometimes I really do wonder why it feels like it's pulling like my old 335i. Sometimes when I get on it it really goes and other times it feels like it never hits full boost. JLBAB, thanks for the input I am going to have them look into it next time the car is in. I know my statement above is a little conjumbled.... In all honesty I've only put 1900 miles on the car in 7 months. Maybe I just need to get to drive the car to get a real fair assessment. Thanks guys, Matt
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02-14-2015, 08:39 AM	#13
Taimur Second Lieutenant 21 Rep 270 Posts Drives: '15 M3 Join Date: May 2007 Location: Long Island, NY iTrader: (0)	Matt, I haven't taken it for service yet. The snow in the north east is not helping. Will post back here once completed.
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02-14-2015, 10:25 AM	#14
Wei718 Major 340 Rep 1,089 Posts Drives: 718 GT4 Join Date: Nov 2012 Location: Hayward iTrader: (9)	After you guys pull your battery for a reset, drive your car hard to let the Ecu relearn your driving style.
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02-14-2015, 12:19 PM	#15
GOLFFRR 10773 Rep 27,587 Posts Drives: GOLFFRR cart Join Date: Mar 2009 Location: we sell BMWs to "ALL" US states iTrader: (4)	could be way off but are you driving with MSD on (or whatever the initials are)? It could be the wheels are slipping and the car is cutting the power? I know when I drive with it off the car is a totally different animal. With it on it kills the power frequently could be way off!! just throwing it out there __________________ BEFORE YOU BUY YOUR NEXT BMW, EMAIL OUR GUY KOTE FIRST! Kote M Sales:Kotem@bmwofcamarillo.com Cell:805-368-9101 vipfinance@bmwofcamarillo.com for warranties!
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