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      01-16-2025, 08:07 AM   #1
OnlyDaanish
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Engine Vibration?

Hi all!

I have a 2015 640i GC xDrive with 67k and Stg1 MHD tune + Stg2 XHP on it.

I bought this car 4 months ago and I noticed the cabin vibrates at idle for the most part. I figure it’s no big deal and needs some new mounts and a tune up.
I first changed the spark plugs. Then the motor mounts. The vibration is better but still veryyyy noticeable for the most part.

Here’s when the vibration DOESNT occur at idle:
  • When coming down to an idle after driving a decent good speed on the highway or local for a little while. (Ex. Cruising at 30-60mph with no stopping so the engines at a steady 1500 ish RPM on 6/8th gear for some time
  • When I switch to sport mode and drive for a minute. The vibration is almost 0

Here’s my questions and theory if someone can help:

1. I was under the impression this car would feel more like a Lexus where there’s 0 cabin vibration. Is this not the case? Is idle vibration normal on this car like it is on a Honda??

2. I used Corteco motor mounts like a moron. I read afterward that these may not be as oem as stated on FCP due to manufacturing changes? Could it be this?

3. I put in NGK spark plugs (also like a moron) which I didn’t realize are 1 step colder for the n55 engine. I have only a stg 1 tune which is nothing really so could the colder plugs be causing issues?

4. I’m not sure if this is odd behavior as well but when I turn off the car. It doesn’t feel like an instant silent shut off. It feels a lot like my Acura where it kind of spudders like it’s choking. Turning it off also gives a very noticeable vibration shaking as it’s choking off

Last edited by OnlyDaanish; 01-16-2025 at 08:13 AM.. Reason: Typo
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      01-18-2025, 05:30 PM   #2
jayjenx
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I just had the same thing happen. Couldn't figure it out. Took it to local indy and they said engine mounts collapsed. Replaced and vibration gone.
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      01-24-2025, 09:44 AM   #3
Dasein2
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On mine w/N63, the drivetrain vibrations were totally isolated, and I've only notice the slightest change over 6 or so years/many miles. Sounds like a possible misfire but that should throw a code. I don't have experience with N55 though.
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      02-15-2025, 07:06 PM   #4
OnlyDaanish
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jayjenx Ahhhhh did you get OEM mounts? Mine were Corteco...

Dasein2 Well your have a 8 cyl so its duper different :/
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