Eng/Trans Noise at Idle

MDEEDS71 · 08-19-2015, 12:01 PM

Looking to see if anyone can elaborate on a noise I am hearing.

2014 (bought new July 2105) DCT with stock exhaust and 3500km on odometer. M5 was broken in properly with only limited time in the upper RPM band and above 110mph. I did have the rev limiter hit once when I did not notice the car was in sequential versus standard drive.

Just after starting the car and pulling out of the garage I place the M5 in N with the parking brake on. I then can hear a sound similar to a water pump starting to get noisy/accessory pulley or a manual transmission that is in N...a rumbling to low tone jingling noise. It is very faint when listening from the outside and appears to emanate from under the front forward of the doors. When the hood is open I can slightly sense it drivers right of the engine mid block or so...but cannot tell if it is internal or external to the motor.

Again it is VERY faint but enough that I notice it...as we all do as critical of these cars as we are. For all I know this might be normal for this engine...but my other BMW V8s don't exhibit this or at least I have never heard it. But this is the first DCT and I think it may be the N mode that is making this noise.

Thoughts?

skypx · 08-19-2015, 03:15 PM

I had a similar issue. For some strange reason when the fuel was below half a tank the car sounded strange at idle. Dealership thought I was crazy. 3 weeks later I had the dreaded check engine light. Turns out the coil and an injector stopped functioning correctly and needed to be replaced. This was on a 2014 CP M5. Good luck.

08-19-2015, 12:01 PM	#1
MDEEDS71 New Member 8 Rep 27 Posts Drives: 2014 M5 Singapore Grey Join Date: Jul 2015 Location: Stuttgart, DE and PA, USA iTrader: (0)	Eng/Trans Noise at Idle Looking to see if anyone can elaborate on a noise I am hearing. 2014 (bought new July 2105) DCT with stock exhaust and 3500km on odometer. M5 was broken in properly with only limited time in the upper RPM band and above 110mph. I did have the rev limiter hit once when I did not notice the car was in sequential versus standard drive. Just after starting the car and pulling out of the garage I place the M5 in N with the parking brake on. I then can hear a sound similar to a water pump starting to get noisy/accessory pulley or a manual transmission that is in N...a rumbling to low tone jingling noise. It is very faint when listening from the outside and appears to emanate from under the front forward of the doors. When the hood is open I can slightly sense it drivers right of the engine mid block or so...but cannot tell if it is internal or external to the motor. Again it is VERY faint but enough that I notice it...as we all do as critical of these cars as we are. For all I know this might be normal for this engine...but my other BMW V8s don't exhibit this or at least I have never heard it. But this is the first DCT and I think it may be the N mode that is making this noise. Thoughts?
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08-19-2015, 03:15 PM	#2
skypx Veteran U.S. Army 60 Rep 771 Posts Drives: ///M Join Date: Nov 2011 Location: Germany iTrader: (0)	I had a similar issue. For some strange reason when the fuel was below half a tank the car sounded strange at idle. Dealership thought I was crazy. 3 weeks later I had the dreaded check engine light. Turns out the coil and an injector stopped functioning correctly and needed to be replaced. This was on a 2014 CP M5. Good luck.
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