Worried

prodigal_m · 03-03-2012, 11:48 AM

I have had this happen on my S54 MZ3, MZ4 and several S54 equipped M3's w/the stock tune. I have not had any RPM fluctuations or issues once I had an ECU remap (such as AA, Shark, Evolve, etc...) so I'm wondering if the factory tune has something to do with it.

22022 · 03-03-2012, 11:59 AM

My car does the same thing even after installing the supercharger usually when the tank is at 1/4 or less.

Hoa · 03-03-2012, 11:15 PM

i have owned 3 z4m so far and all of them does it. it normally happen after a long drive and then i come to a complete stop (red light or parking with engine running). the idle struggles for about 1 second and comes back to normal. it drops to about 3-400rpm and come back up.

i took my first z4mc to the dealership since the car was only a few months old at the time. they kept the car for several days and told me it is normal. i didn't believe them at first but on my second and third z4m, all of them have done it to me so its not a surprise to me anymore. it never die out on me or created a check light.

gcochard · 03-24-2012, 11:25 PM

Just a quick bump, I just had my valves adjusted and checked all vanos stuff. The exhaust hub was in perfect condition, and the intake hub didn't have loose bolts (wiggle test). I replaced the vanos filter, but it didn't look at all dirty when I pulled it. In fact, the new filter looked dirtier than the old one after running for 10 minutes.

BMW Maniac · 03-25-2012, 01:23 AM

My Dad is driving my car and also had the same thing happened.

Inspection II coming when I get back.

RADRACR · 03-25-2012, 01:33 AM

Didn't read the whole thread but this has happened to me a handful of times between 0 and 20K miles. It never fully died. I'm at 30K+ now and it is happening much less frequently. Then again, I moved to California last year so maybe fuel quality has something to do with it. I always used 92 in WA but CA only has 91. In WA, I used a dose of Techron Concentrate every few months. Not needed in CA seemingly.

My guess is it's an ECU bug.

dreamingat30fps · 03-25-2012, 04:17 PM

To follow up I actually had it die completely once now. I was running low on fuel and right after I filled up it died on me at a light. I have about 4k miles until inspection 2. I do find it does it more on a low tank so I try to keep it above half now.

mpm3 · 03-25-2012, 04:30 PM

hmm, this has happened to me once..should i be concerned ? IDK

03-03-2012, 11:48 AM	#23
prodigal_m Member 14 Rep 178 Posts Drives: 2018 Estoril Blue/Black F31 Join Date: Dec 2010 Location: SE Wisconsin iTrader: (1)	I have had this happen on my S54 MZ3, MZ4 and several S54 equipped M3's w/the stock tune. I have not had any RPM fluctuations or issues once I had an ECU remap (such as AA, Shark, Evolve, etc...) so I'm wondering if the factory tune has something to do with it.
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03-03-2012, 11:59 AM	#24
22022 Private First Class 15 Rep 112 Posts Drives: VT2-500 ZM4 roadster Join Date: Dec 2009 Location: Vancouver iTrader: (0)	My car does the same thing even after installing the supercharger usually when the tank is at 1/4 or less. __________________
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03-03-2012, 11:15 PM	#25
Hoa Major 513 Rep 1,356 Posts Drives: BMW Join Date: May 2010 Location: GA iTrader: (9)	i have owned 3 z4m so far and all of them does it. it normally happen after a long drive and then i come to a complete stop (red light or parking with engine running). the idle struggles for about 1 second and comes back to normal. it drops to about 3-400rpm and come back up. i took my first z4mc to the dealership since the car was only a few months old at the time. they kept the car for several days and told me it is normal. i didn't believe them at first but on my second and third z4m, all of them have done it to me so its not a surprise to me anymore. it never die out on me or created a check light.
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03-24-2012, 11:25 PM	#26
gcochard Captain 24 Rep 784 Posts Drives: 2011.5 E90 M3 Join Date: Oct 2010 Location: South OC iTrader: (2) Garage List 2011 BMW M3 [0.00]	Just a quick bump, I just had my valves adjusted and checked all vanos stuff. The exhaust hub was in perfect condition, and the intake hub didn't have loose bolts (wiggle test). I replaced the vanos filter, but it didn't look at all dirty when I pulled it. In fact, the new filter looked dirtier than the old one after running for 10 minutes.
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03-25-2012, 01:23 AM	#27
BMW Maniac Lieutenant 22 Rep 428 Posts Drives: Former Z4M coupe owner Join Date: Jan 2009 Location: Orlando, FL iTrader: (1)	My Dad is driving my car and also had the same thing happened. Inspection II coming when I get back. __________________ 1997 /// M3 Coupe Arctic Silver CES STAGE IV (651rwhp/615rwtq) 1999 /// M3 Convertible Techno Violet
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03-25-2012, 01:33 AM	#28
RADRACR Captain 84 Rep 924 Posts Drives: '08 Z4 M Coupé // '09 X5 d Join Date: Apr 2010 Location: Sioux Falls, South Dakota iTrader: (2)	Didn't read the whole thread but this has happened to me a handful of times between 0 and 20K miles. It never fully died. I'm at 30K+ now and it is happening much less frequently. Then again, I moved to California last year so maybe fuel quality has something to do with it. I always used 92 in WA but CA only has 91. In WA, I used a dose of Techron Concentrate every few months. Not needed in CA seemingly. My guess is it's an ECU bug. __________________ '08 Z4 ///M Coupé (#1765/1815) — 1 of 68 Sepang Bronze / Black Nappa / Madeira Wood / 1 of 1 this combo 19" Advan RS / AP Racing / Bridgestone RE-11 / Autosolutions SSK / R.E. Diablo / R.E. trans mounts '09 X5 35d — Space Grey / Saddle Brown 20" Forgestar F14 / SCR Delete
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03-25-2012, 04:17 PM	#29
dreamingat30fps Lieutenant Colonel 5307 Rep 1,907 Posts Drives: Miata, Cayenne, Model 3, F350 Join Date: Jan 2010 Location: South Florida & NC iTrader: (1)	To follow up I actually had it die completely once now. I was running low on fuel and right after I filled up it died on me at a light. I have about 4k miles until inspection 2. I do find it does it more on a low tank so I try to keep it above half now.
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03-25-2012, 04:30 PM	#30
mpm3 Captain 70 Rep 819 Posts Drives: 2007 M coupe Join Date: Jun 2010 Location: New Jersey iTrader: (7) Garage List 2007 BMW M coupe [10.00] 2011 BMW M3 [0.00]	hmm, this has happened to me once..should i be concerned ? IDK __________________
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