Burning Smells on WOT

Music XD · 01-30-2014, 11:37 AM

Lately when I go WOT, immediately I get a burning smell, which then dissipates a few moments later... It doesn't seem to happen any other time, even 'spirited driving' doesn't seem to cause it... Any ideas?

2008 335i

John320d · 01-30-2014, 12:59 PM

wot is wot

Jase 320d · 01-30-2014, 01:01 PM

Wide Open Throttle

KM79 · 01-30-2014, 02:29 PM

Plastic bag stuck to exhaust?

michaelalex17 · 01-30-2014, 02:31 PM

unburned fuel

seanblee · 01-31-2014, 04:20 AM

Does this happen only on sudden transitions to WOT? Might be worth checking the aux belt on the front of the engine - early 335i had issues with the left-hand engine mount allowing too much twist, letting the bottom pulley collide with the subframe and rubbing the belt under sudden load. Doesn't sound hugely likely, though...

phil200tdi · 01-31-2014, 06:29 AM

Music XD · 02-01-2014, 03:59 AM

I keep reading about plastic bags stuck to exhausts...! Surely if that was the case though it'd be constant.

Actually it does only happen on sudden transitions to WOT... I'll check out the aux belt but being a 2008 I'd hope that isn't the case!

Could it actually just be unburnt fuel?

Strange!

seanblee · 02-01-2014, 05:18 AM

I'd expect unburnt fuel to smell like, well, fuel, rather than burning!

E91-Gaz · 02-01-2014, 05:27 AM

Quote:

Originally Posted by seanblee

I'd expect unburnt fuel to smell like, well, fuel, rather than burning!

+1

Clutch perhaps??

Music XD · 02-02-2014, 08:10 AM

It's an auto!

E91-Gaz · 02-02-2014, 08:23 AM

Quote:

Originally Posted by Music Mark

It's an auto!

Of course it is I should have known that....

Music XD · 02-02-2014, 09:04 AM

Quote:

Originally Posted by E91-Gaz

Of course it is I should have known that....

Didn't mean to sound rude, sorry!

KM79 · 02-03-2014, 02:11 PM

Quote:

Originally Posted by Music Mark

I keep reading about plastic bags stuck to exhausts...! Surely if that was the case though it'd be constant.

Actually it does only happen on sudden transitions to WOT... I'll check out the aux belt but being a 2008 I'd hope that isn't the case!

Could it actually just be unburnt fuel?

Strange!

Plastic burning smell becomes very much more pronounced when the exhaust becomes very hot very quickly ie full throttle especially if it's near the front pipes .

Music XD · 07-04-2014, 09:54 AM

A few days after I posted this, the issue magically disappeared again and hasn't returned, so I'm guessing it was just a plastic bag after all!

KM79 · 07-04-2014, 06:14 PM

gazz1971 · 07-07-2014, 02:33 AM

I get this as well mines manual and its not clutch exhaust lasts for a few seconds then goes .To me its a burning oil smell but uses no oil at oil and no smoke out the exhausts .

KM79 · 07-07-2014, 08:53 AM

Quote:

Originally Posted by gazz1971

I get this as well mines manual and its not clutch exhaust lasts for a few seconds then goes .To me its a burning oil smell but uses no oil at oil and no smoke out the exhausts .

Oil seeping onto exhaust,what engine type is it?

gazz1971 · 07-07-2014, 09:18 AM

335i N54 no leaks anywhere no oil loss ever ?

KM79 · 07-07-2014, 01:39 PM

It can be tricky to spot but I have seen the 6 cyl engines seep at the back left corner where no.6 is and drip onto exhaust creating a dirty patch.Itll never lose a noticeable amount of oil and it never hits the ground/ under tray as it gets burned on the exhaust.

01-30-2014, 11:37 AM	#1
Music XD Private First Class 8 Rep 149 Posts Drives: E92 335i M Sport Join Date: Apr 2013 Location: Essex iTrader: (0)	Burning Smells on WOT Lately when I go WOT, immediately I get a burning smell, which then dissipates a few moments later... It doesn't seem to happen any other time, even 'spirited driving' doesn't seem to cause it... Any ideas? 2008 335i
	Appreciate 0 Tweet Quote

01-30-2014, 12:59 PM	#2
John320d Lieutenant 31 Rep 559 Posts Drives: BMW 320d E93 Join Date: Dec 2009 Location: Manchester UK iTrader: (0)	wot is wot
	Appreciate 0 Quote

01-30-2014, 01:01 PM	#3
Jase 320d Wheelbarrow Edition 60 Rep 1,608 Posts Drives: Arctic 320d Join Date: Sep 2013 Location: Dumfries and Galloway iTrader: (1)	Wide Open Throttle
	Appreciate 0 Quote

01-30-2014, 02:29 PM	#4
KM79 Major 140 Rep 1,445 Posts Drives: 2017 335D Msport Saloon Join Date: Jul 2013 Location: Scotland iTrader: (0)	Plastic bag stuck to exhaust?
	Appreciate 0 Quote

01-30-2014, 02:31 PM	#5
michaelalex17 Brigadier General 596 Rep 3,386 Posts Drives: Manual Wagon Join Date: Aug 2010 Location: CT iTrader: (4)	unburned fuel __________________
	Appreciate 0 Quote

01-31-2014, 04:20 AM	#6
seanblee Captain 47 Rep 791 Posts Drives: 2021 G21 M340i Join Date: Dec 2008 Location: Enfield, UK iTrader: (2)	Does this happen only on sudden transitions to WOT? Might be worth checking the aux belt on the front of the engine - early 335i had issues with the left-hand engine mount allowing too much twist, letting the bottom pulley collide with the subframe and rubbing the belt under sudden load. Doesn't sound hugely likely, though... __________________ 2019 VW Golf GTI Performance \| H&R rear ARB Previously 2007 E92 335i SE auto \| Quaife LSD \| Birds B3 ARBs \| Evolve Stage 1
	Appreciate 0 Quote

01-31-2014, 06:29 AM	#7
phil200tdi Colonel 112 Rep 2,621 Posts Drives: 335i M Sport E90 LCI manual Join Date: Jan 2011 Location: Aylesbury iTrader: (1)
	Appreciate 0 Quote

02-01-2014, 03:59 AM	#8
Music XD Private First Class 8 Rep 149 Posts Drives: E92 335i M Sport Join Date: Apr 2013 Location: Essex iTrader: (0)	I keep reading about plastic bags stuck to exhausts...! Surely if that was the case though it'd be constant. Actually it does only happen on sudden transitions to WOT... I'll check out the aux belt but being a 2008 I'd hope that isn't the case! Could it actually just be unburnt fuel? Strange!
	Appreciate 0 Quote

02-01-2014, 05:18 AM	#9
seanblee Captain 47 Rep 791 Posts Drives: 2021 G21 M340i Join Date: Dec 2008 Location: Enfield, UK iTrader: (2)	I'd expect unburnt fuel to smell like, well, fuel, rather than burning! __________________ 2019 VW Golf GTI Performance \| H&R rear ARB Previously 2007 E92 335i SE auto \| Quaife LSD \| Birds B3 ARBs \| Evolve Stage 1
	Appreciate 0 Quote

02-02-2014, 08:10 AM	#11
Music XD Private First Class 8 Rep 149 Posts Drives: E92 335i M Sport Join Date: Apr 2013 Location: Essex iTrader: (0)	It's an auto!
	Appreciate 0 Quote

07-04-2014, 09:54 AM	#15
Music XD Private First Class 8 Rep 149 Posts Drives: E92 335i M Sport Join Date: Apr 2013 Location: Essex iTrader: (0)	A few days after I posted this, the issue magically disappeared again and hasn't returned, so I'm guessing it was just a plastic bag after all!
	Appreciate 0 Quote

07-04-2014, 06:14 PM	#16
KM79 Major 140 Rep 1,445 Posts Drives: 2017 335D Msport Saloon Join Date: Jul 2013 Location: Scotland iTrader: (0)
	Appreciate 0 Quote

07-07-2014, 02:33 AM	#17
gazz1971 Private First Class 6 Rep 127 Posts Drives: F10 M5 Join Date: Mar 2014 Location: Derby iTrader: (1)	I get this as well mines manual and its not clutch exhaust lasts for a few seconds then goes .To me its a burning oil smell but uses no oil at oil and no smoke out the exhausts . __________________ F10 M5
	Appreciate 0 Quote

07-07-2014, 09:18 AM	#19
gazz1971 Private First Class 6 Rep 127 Posts Drives: F10 M5 Join Date: Mar 2014 Location: Derby iTrader: (1)	335i N54 no leaks anywhere no oil loss ever ? __________________ F10 M5
	Appreciate 0 Quote

07-07-2014, 01:39 PM	#20
KM79 Major 140 Rep 1,445 Posts Drives: 2017 335D Msport Saloon Join Date: Jul 2013 Location: Scotland iTrader: (0)	It can be tricky to spot but I have seen the 6 cyl engines seep at the back left corner where no.6 is and drip onto exhaust creating a dirty patch.Itll never lose a noticeable amount of oil and it never hits the ground/ under tray as it gets burned on the exhaust.
	Appreciate 0 Quote