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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Fri, Mar-30-2018, 10:18:34 PM   #1
michaelkapanzhi
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Default Car dies going from high rpms to idle rpm

So ever since I got my car (2005 M3) in 2016 I've had this issue with it. If I'm at cruising speed in gear and press in the clutch long enough for the RPMs to drop down to idle, the car will die. This is only an issue if i decide to put it into neutral before I come to a stop. Driving normally, (leaving it in gear until I come to a stop or downshifting to a stop) this doesn't happen. Since this doesn't really effect my everyday driving I've just ignored it.

Does anyone know what may be the cause of this?
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Old Fri, Mar-30-2018, 10:31:42 PM   #2
e46Dan
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Default Re: Car dies going from high rpms to idle rpm

Quote:
Originally Posted by michaelkapanzhi View Post
So ever since I got my car (2005 M3) in 2016 I've had this issue with it. If I'm at cruising speed in gear and press in the clutch long enough for the RPMs to drop down to idle, the car will die. This is only an issue if i decide to put it into neutral before I come to a stop. Driving normally, (leaving it in gear until I come to a stop or downshifting to a stop) this doesn't happen. Since this doesn't really effect my everyday driving I've just ignored it.

Does anyone know what may be the cause of this?
Could be a vacuum leak. You might try a smoke test.
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Old Sat, Mar-31-2018, 12:14:14 AM   #3
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Default Re: Car dies going from high rpms to idle rpm

Mostly an intake vacuum leak. I had that exact problem. I installed an intake and I didnít put everything back together tightly. It was so little of a crack open but enough to cause stalls.

Also if you have an intake you want to use the mesh filter inside the OEM box to put in between the cone filter and the intake pipe before the MAF.
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Old Sat, Mar-31-2018, 03:32:05 AM   #4
michaelkapanzhi
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Default Re: Car dies going from high rpms to idle rpm

I actually purchased the car with a K&N intake already installed and don't have any of the OEM parts. I'll check for a vacuum leak next.
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Old Sat, Mar-31-2018, 05:10:05 AM   #5
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Default Re: Car dies going from high rpms to idle rpm

Just undo everything from the intake plenum and put it back together nice and snug. I really didnít know where my leak was until I did that during some maintenance. Then I was pleasantly surprised when my engine stopped doing exactly what yours is doing.
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Old Mon, Apr-02-2018, 05:35:33 PM   #6
cozmo kraemer
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Default Re: Car dies going from high rpms to idle rpm

You need the stock MAF screen to install in the K&N intake. That helps with this problem, but doesn't completely solve it. To solve it, get rid of the K&N and go back to a stock intake box.
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Old Tue, Apr-03-2018, 12:38:43 AM   #7
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Default Re: Car dies going from high rpms to idle rpm

As others said, the K&N intake is your problem. A stock box will fix the issue. On mine the problem also went away when I taped off the duct that pulls air from the kidney grills.
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Old Tue, Apr-03-2018, 02:31:35 AM   #8
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Default Re: Car dies going from high rpms to idle rpm

Wow Iíve never had a problem with mine once I had leaks sorted. Itís perfectly fine and the induction sound I get creates a great emotion when at WOT.
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Discussing Car dies going from high rpms to idle rpm in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)