noisier on small throttle openings

mapyn · 10-21-2023, 09:32 AM

Anyone have any idea why a diesel (mine's the 3.0) is so grumbly in the early rpm and sorts itself out maybe 500 rpm up? mine sounds quite mechanical low down but as soon as its built some boost it's pretty smooth

danb1979 · 10-21-2023, 09:36 AM

Cold start or when warm?

Have you had the codes read to see if there are any issues stored etc?

Lorcan · 10-21-2023, 11:11 AM

Fuel filter.

Watsey · 10-21-2023, 12:02 PM

Quote:

Originally Posted by mapyn

Anyone have any idea why a diesel (mine's the 3.0) is so grumbly in the early rpm and sorts itself out maybe 500 rpm up? mine sounds quite mechanical low down but as soon as its built some boost it's pretty smooth

Can you be more specific, i.e. the rpm when it's grumbly ?

ade555 · 10-21-2023, 12:11 PM

Are you talking about low revs diesel clatter on N57 engines by any chance?

Eddamoo · 10-22-2023, 02:23 AM

I thought it was the EGR that caused the nasty low rpm/load clatter.

I'm sure mine is worse recently, but it's probably because I also drive my Mrs much more refined X4!

Watsey · 10-22-2023, 04:32 AM

Quote:

Originally Posted by Eddamoo

I thought it was the EGR that caused the nasty low rpm/load clatter.

I'm sure mine is worse recently, but it's probably because I also drive my Mrs much more refined X4!

Yes it is. From what the OP described (grumble) I think he’s hearing something else.

mapyn · 10-23-2023, 09:43 AM

Quote:

Originally Posted by ade555

Are you talking about low revs diesel clatter on N57 engines by any chance?

Absolutely, what's that all about?

ade555 · 10-23-2023, 10:34 AM

Quote:

Originally Posted by mapyn

Absolutely, what's that all about?

EGR. Even worse after recent BMW recall, I had two replaced by them so far and apparently is normal.

Is only apparent when you sort of taking a easy, press throttle bit harder from get go and you won't notice. I'm not fun of the N57 been honest compare to previous generation of BMW 6 pot diesel engines.

mapyn · 10-23-2023, 10:06 PM

so it'll go away if i remove the egr?

ade555 · 10-24-2023, 12:46 AM

Quote:

Originally Posted by mapyn

so it'll go away if i remove the egr?

I can't recommend something that I didn't do my self.

SR-25 · 10-24-2023, 03:15 AM

I was sitting in traffic on an incline marginally steep enough that the car (F31 35D) wouldn't creep forward. With just a light touch of the accelerator to get the car moving it just sounded ever so slightly unsettled but not in a bad way. I never notice it in any other circumstance but only on the lightest of throttle applications.

Atleast it's seemingly normal though, i've had two recalls previously as well.

TurboWeasel · 10-24-2023, 09:09 AM

Quote:

Originally Posted by ade555

EGR. Even worse after recent BMW recall, I had two replaced by them so far and apparently is normal.

Is only apparent when you sort of taking a easy, press throttle bit harder from get go and you won't notice. I'm not fun of the N57 been honest compare to previous generation of BMW 6 pot diesel engines.

Mine had already had the recall done when I bought it, so I thought that was just how N57s are!

Sounds like bad mapping then if the EGR gases are disturbing the burn to that extent.

The B57 doesn't make anything like that kind of racket!

mapyn · 11-09-2023, 03:43 PM

egr gone = fixed

10-21-2023, 09:32 AM	#1
mapyn Private 8 Rep 54 Posts Drives: f30 330d saloon Join Date: Jul 2023 Location: derbyshire iTrader: (0)	noisier on small throttle openings Anyone have any idea why a diesel (mine's the 3.0) is so grumbly in the early rpm and sorts itself out maybe 500 rpm up? mine sounds quite mechanical low down but as soon as its built some boost it's pretty smooth
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10-21-2023, 09:36 AM	#2
danb1979 Idiotic lifter of heavy stones... 2015 Rep 2,195 Posts Drives: 2015 F31 325D M Sport touring Join Date: Feb 2022 Location: Preston, Lancashire - UK iTrader: (0)	Cold start or when warm? Have you had the codes read to see if there are any issues stored etc? __________________ My car: 2015 F31 325D M Sport Touring in Glacier Metallic Silver - Keeping it OEM 'Plus' Project: https://f30.bimmerpost.com/forums/sh....php?t=1982298
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10-21-2023, 11:11 AM	#3
Lorcan The artist formerly known as AC Schnitzer UK 3610 Rep 4,518 Posts Drives: The Yellow Peril Join Date: Apr 2013 Location: Norfolk UK iTrader: (0)	Fuel filter.
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10-21-2023, 12:11 PM	#5
ade555 Second Lieutenant 124 Rep 272 Posts Drives: BMW F36 430D Join Date: Aug 2021 Location: Yorkshire iTrader: (0)	Are you talking about low revs diesel clatter on N57 engines by any chance?
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10-22-2023, 02:23 AM	#6
Eddamoo Captain 407 Rep 823 Posts Drives: BMW 430dX Join Date: Apr 2018 Location: Sheffield, England iTrader: (0)	I thought it was the EGR that caused the nasty low rpm/load clatter. I'm sure mine is worse recently, but it's probably because I also drive my Mrs much more refined X4!
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10-23-2023, 10:06 PM	#10
mapyn Private 8 Rep 54 Posts Drives: f30 330d saloon Join Date: Jul 2023 Location: derbyshire iTrader: (0)	so it'll go away if i remove the egr?
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10-24-2023, 03:15 AM	#12
SR-25 Private 86 Rep 92 Posts Drives: F31 335d Touring Join Date: Mar 2013 Location: Sheffield iTrader: (0)	I was sitting in traffic on an incline marginally steep enough that the car (F31 35D) wouldn't creep forward. With just a light touch of the accelerator to get the car moving it just sounded ever so slightly unsettled but not in a bad way. I never notice it in any other circumstance but only on the lightest of throttle applications. Atleast it's seemingly normal though, i've had two recalls previously as well.
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11-09-2023, 03:43 PM	#14
mapyn Private 8 Rep 54 Posts Drives: f30 330d saloon Join Date: Jul 2023 Location: derbyshire iTrader: (0)	egr gone = fixed
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