lumpy idle on startup

phucks1976 · 03-24-2010, 04:05 AM

Do you M3's run very lumpy / awkward on cold start?

hugehead · 03-24-2010, 04:14 PM

its normal (as stated in the owner's manual

)

Flapps · 03-24-2010, 07:24 PM

Quote:

Originally Posted by hugehead

its normal (as stated in the owner's manual

)

+1

Flapps

Dartanium · 03-24-2010, 07:54 PM

love the cold start sound

Subw00er · 03-24-2010, 11:35 PM

Also heard its normal from respected m3 mechanic at a BMW dealer. He said something like "These are hand built engines and are a bit finicky." When they warm up, they're like butter!

Enjoy it, these are things that give cars character!

daveyM3 · 03-25-2010, 04:42 AM

There is a software update which cures this issue, and also gets rid of the huge flat spot/ hesitation between 2000 and 3000 rpm. The problem is the software update is not being made available to everyone. A few guys on the Mtorque and M3torque boards have had it done, but only after much debate with their dealers. I believe the problem is the software takes a long time to download (the car must be left connected to computer overnight!) and BMW are refusing to reimburse any dealers who install the software. Those who got the update got it as a good will gesture. I think this issue only affects older cars, newer ones will come with the updated software.

KadeSdad · 03-25-2010, 06:06 AM

Quote:

Originally Posted by daveyM3

There is a software update which cures this issue, and also gets rid of the huge flat spot/ hesitation between 2000 and 3000 rpm. The problem is the software update is not being made available to everyone. A few guys on the Mtorque and M3torque boards have had it done, but only after much debate with their dealers. I believe the problem is the software takes a long time to download (the car must be left connected to computer overnight!) and BMW are refusing to reimburse any dealers who install the software. Those who got the update got it as a good will gesture. I think this issue only affects older cars, newer ones will come with the updated software.

Guessing this update is for DCT

daveyM3 · 03-25-2010, 06:37 AM

Quote:

Originally Posted by KadeSdad

Guessing this update is for DCT

I'm not 100% but I dont think so. I believe it was an engine management software update. There was a thread about it on Mtorque, but its shut down now. There is a little bit of info on M3torque. I think one of the guys who had it done was called Tony B.

KadeSdad · 03-25-2010, 06:52 AM

Quote:

Originally Posted by daveyM3

I'm not 100% but I dont think so. I believe it was an engine management software update. There was a thread about it on Mtorque, but its shut down now. There is a little bit of info on M3torque. I think one of the guys who had it done was called Tony B.

Seems a little odd for a manual to flat spot in that rev range, luckily I have never noticed any flat spots through out the range. I know the early software versions were a nightmare with DCT as lag was a real problem.

I have heard horror stories of M5's taking up to 24hrs to update software, as you say some dealers will not even offer it!

M3-FAST · 03-25-2010, 06:53 AM

Mine is rough when cold, also if you blip the throttle quite hard, the engine does not rev as freely as when it is warmer, almost like it i being strangled.

Give i a min and it sounds a peach

daveyM3 · 03-25-2010, 07:05 AM

Easiest way to replicate flat spot is to accelerate at about 2000 rpm in third gear. The car will hold back/ feel low on power until about 3500 rpm, when you get a sudden burst of power. Almost feels like a vtec kick for anyone who has ever driven a type r. My car is Sept 07 and and suffers badly from this.

KadeSdad · 03-25-2010, 07:38 AM

Quote:

Originally Posted by daveyM3

Easiest way to replicate flat spot is to accelerate at about 2000 rpm in third gear. The car will hold back/ feel low on power until about 3500 rpm, when you get a sudden burst of power. Almost feels like a vtec kick for anyone who has ever driven a type r. My car is Sept 07 and and suffers badly from this.

Strange, as mine has pretty good low down torque and doesn't seem to suffer or not that I have noticed anyway. I have modified quite a bit so maybe that's helped?

Do let me know if you find anything else out though.

daveyM3 · 03-25-2010, 08:14 AM

Quote:

Originally Posted by KadeSdad

Strange, as mine has pretty good low down torque and doesn't seem to suffer or not that I have noticed anyway. I have modified quite a bit so maybe that's helped?

Do let me know if you find anything else out though.

I would imaging your new exhaust system and remap would solve this issue mate.

03-24-2010, 04:05 AM	#1
phucks1976 New Member 5 Rep 15 Posts Drives: 2007 m3 Join Date: Jan 2010 Location: london iTrader: (0)	lumpy idle on startup Do you M3's run very lumpy / awkward on cold start?
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03-24-2010, 04:14 PM	#2
hugehead Lieutenant 9 Rep 475 Posts Drives: E90 M3 Join Date: Feb 2010 Location: manchester iTrader: (5) Garage List 2009 E90 M3 [8.00] 1987 Porsche 944S 16v [0.00] 2006 BMW E60 M5 [7.00] 2001 Subaru Impreza P1 [9.00]	its normal (as stated in the owner's manual )
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03-24-2010, 07:54 PM	#4
Dartanium Lieutenant 11 Rep 566 Posts Drives: 09 E90 M3 Join Date: Oct 2008 Location: CA iTrader: (0)	love the cold start sound
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03-24-2010, 11:35 PM	#5
Subw00er Bates '08 Interlagos Launch 126 Rep 1,230 Posts Drives: 440i xGC, ZL1, JCW Join Date: Nov 2005 Location: NY iTrader: (2)	Also heard its normal from respected m3 mechanic at a BMW dealer. He said something like "These are hand built engines and are a bit finicky." When they warm up, they're like butter! Enjoy it, these are things that give cars character! __________________ Custom Exhaust Project: Bates Valvetronic exhaust: http://www.m3post.com/forums/showthread.php?t=253661 -- Exhaust Mod pics in here: http://www.flickr.com/photos/40236795@N03/ DON'T BUY Race Ready Performance electronic cutout valves. Here's why: http://www.m3post.com/forums/showthr...40#post9589740
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03-25-2010, 04:42 AM	#6
daveyM3 Private First Class 5 Rep 144 Posts Drives: Melbourne Red M3 Join Date: Sep 2009 Location: N. Ireland iTrader: (0)	There is a software update which cures this issue, and also gets rid of the huge flat spot/ hesitation between 2000 and 3000 rpm. The problem is the software update is not being made available to everyone. A few guys on the Mtorque and M3torque boards have had it done, but only after much debate with their dealers. I believe the problem is the software takes a long time to download (the car must be left connected to computer overnight!) and BMW are refusing to reimburse any dealers who install the software. Those who got the update got it as a good will gesture. I think this issue only affects older cars, newer ones will come with the updated software.
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03-25-2010, 06:53 AM	#10
M3-FAST Defected to the dark side..... 210 Rep 5,795 Posts Drives: BMW M5 LCi Join Date: May 2007 Location: Stafford, UK iTrader: (11) Garage List 2009 E90 M3 [10.00] 2007 325i M-sport C ... [9.00]	Mine is rough when cold, also if you blip the throttle quite hard, the engine does not rev as freely as when it is warmer, almost like it i being strangled. Give i a min and it sounds a peach
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03-25-2010, 07:05 AM	#11
daveyM3 Private First Class 5 Rep 144 Posts Drives: Melbourne Red M3 Join Date: Sep 2009 Location: N. Ireland iTrader: (0)	Easiest way to replicate flat spot is to accelerate at about 2000 rpm in third gear. The car will hold back/ feel low on power until about 3500 rpm, when you get a sudden burst of power. Almost feels like a vtec kick for anyone who has ever driven a type r. My car is Sept 07 and and suffers badly from this.
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