European Auto Source (EAS)
BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read

Go Back   BMW M3 and BMW M4 Forum > BMW F80 M3 / F82 M4 Forum > BMW M3 (F80) and BMW M4 (F82) General Forum

Post Reply
 
Thread Tools Search this Thread
      04-02-2021, 01:56 PM   #1
hzzz
Registered
0
Rep
3
Posts

Drives: 2018 M4 convertible
Join Date: Dec 2020
Location: NJ

iTrader: (0)

Buzzing/rattling at low rpm

My 2018 CPO m4 has a buzzing/metallic rattling only at around 1800 RPM, after the engine is hot. It does not appear at idle, but only appear when the engine is under load. The dealer checked exhaust and found no problem. Does anyone else have had a similar problem?
Appreciate 0
      04-02-2021, 02:13 PM   #2
bsmf8x
Major
bsmf8x's Avatar
United_States
586
Rep
1,382
Posts

Drives: F82
Join Date: Jan 2020
Location: NY

iTrader: (1)

Is it only in sport plus? The car should only be seeing very light throttle at 1800 rpm's. You got Dct or manual?

Giving the car heavy throttle especially a manual is going to lug the engine creating a vibrating feeling at a low rpm like 1800. Ive experienced this in other manual cars, my m4 is a Dct so I wouldn't know as I never give heavy throttle at 1800 rpm
Appreciate 0
      04-04-2021, 09:55 PM   #3
kumkeet
Private
39
Rep
85
Posts

Drives: M3 F80 Dakar Yellow II
Join Date: Jan 2019
Location: Singapore

iTrader: (0)

yes. mine does that as well. I have tried searching in here. Probably exhaust valve flaps vibrating as i hear mine coming from there. So i just change my driving style. Heavy load, low RPM is generally not good for the car anyway
Appreciate 0
      04-05-2021, 06:22 AM   #4
terreh
Registered
2
Rep
4
Posts

Drives: 2016 F80 M3
Join Date: Apr 2020
Location: New Zealand

iTrader: (0)

I get this too, at normal/cruising acceleration between just after 1,500rpm.

After a bit of searching it seems more likely a wastegate rattle than the exhaust valves rattling.

Sounds like a common problem, but doesn't really seem to be an easy fix for it.
Appreciate 0
      04-05-2021, 10:55 AM   #5
Fahrzeugtechnik
New Member
Fahrzeugtechnik's Avatar
Germany
3
Rep
7
Posts

Drives: M4 Coupe
Join Date: Oct 2020
Location: FFM

iTrader: (0)

Do you have a sound file ?
Appreciate 0
      04-07-2021, 04:09 PM   #6
hzzz
Registered
0
Rep
3
Posts

Drives: 2018 M4 convertible
Join Date: Dec 2020
Location: NJ

iTrader: (0)

It is in all throttle modes. Also the car is a DCT. I generally can avoid the problem by releasing the throttle a bit as it goes towards 1800 rpm so that it shifts up. After a bit searching indeed it could be more like a Wastegate problem...

It sounds exactly like this https://f80.bimmerpost.com/forums/sh....php?t=1657374

Last edited by hzzz; 04-07-2021 at 06:28 PM..
Appreciate 0
      04-08-2021, 02:00 AM   #7
kumkeet
Private
39
Rep
85
Posts

Drives: M3 F80 Dakar Yellow II
Join Date: Jan 2019
Location: Singapore

iTrader: (0)

similar sound. But mine comes from the rear exhaust area. So I don't think it's wastegate.
Appreciate 0
      04-08-2021, 03:32 AM   #8
Fahrzeugtechnik
New Member
Fahrzeugtechnik's Avatar
Germany
3
Rep
7
Posts

Drives: M4 Coupe
Join Date: Oct 2020
Location: FFM

iTrader: (0)

Quote:
Originally Posted by hzzz View Post
It is in all throttle modes. Also the car is a DCT. I generally can avoid the problem by releasing the throttle a bit as it goes towards 1800 rpm so that it shifts up. After a bit searching indeed it could be more like a Wastegate problem...

It sounds exactly like this https://f80.bimmerpost.com/forums/sh....php?t=1657374
This is the wastegate i think so
Appreciate 0
      06-19-2021, 02:10 AM   #9
PandaxF82
Private
PandaxF82's Avatar
28
Rep
61
Posts

Drives: 18 BMW M4 6MT
Join Date: Apr 2019
Location: Los Angeles

iTrader: (1)

Any additional info or insight on this?
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -5. The time now is 10:56 PM.




f80post
Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2021, vBulletin Solutions Inc.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST