N54

Gizm0 · 02-03-2015, 08:19 AM

I changed my spark plugs last night (32000 miles since I last did it), and it made a huge improvement.

My car used to hesitate pretty bad every time when accelerating within a few minutes after a cold start. This morning, my car felt smooth as new right after a cold start (18°F), no hesitation whatsoever.

BMW recommends 45k miles interval on the stock N54 engine. On a tuned engine, 25-30k miles interval sounds more appropriate.

The central electrode on each spark plug lost some material, not much, but apparently enough to make a difference.

itsstock02 · 02-03-2015, 11:06 AM

Im going to do my plugs as soon as it warms up. I have the same cold start hesitation as you. I have new injectors too, but im curious if the plugs will fix the problem.

BashShah · 02-03-2015, 11:08 AM

Plugs and possibly adaptation reset.

cotmfk · 02-03-2015, 11:14 AM

I have heard 15-20k on plugs for tuned/modded cars.

GSEN820 · 02-03-2015, 01:21 PM

^^ that's the rule.....not to thread jack but what about the coil packs

jeffro535 · 02-03-2015, 04:52 PM

This motor is seems really finicky so doesn't surprise me. Dealer did plugs at 28k miles in the course of troubleshooting a hesitation and I changed them and the coils at 53k and reset the adaptations and it seemed to make a difference.

TrAcK TRaP · 02-03-2015, 06:46 PM

Quote:

Originally Posted by GSEN820

^^ that's the rule.....not to thread jack but what about the coil packs

PTF guys says 60-65K miles for plugs even if there is nothing wrong with them

John 070 · 02-03-2015, 08:27 PM

I did mine at 41k, no difference, to each his own.

Miller335 · 02-03-2015, 09:10 PM

My plan is every 10K/every other oil change.

02-03-2015, 08:19 AM	#1
Gizm0 Colonel 426 Rep 2,136 Posts Drives: 08 e92 335i 6mt Join Date: Jan 2013 Location: Virginia iTrader: (1)	N54 - Change your spark plugs more often. I changed my spark plugs last night (32000 miles since I last did it), and it made a huge improvement. My car used to hesitate pretty bad every time when accelerating within a few minutes after a cold start. This morning, my car felt smooth as new right after a cold start (18°F), no hesitation whatsoever. BMW recommends 45k miles interval on the stock N54 engine. On a tuned engine, 25-30k miles interval sounds more appropriate. The central electrode on each spark plug lost some material, not much, but apparently enough to make a difference. __________________ JB4 G5 w/ Backend flash - Walbro 450lpfp - VRSF DPs - VRSF 5" stepped IC - DCI - ER CP w/ Tial BOV - 335is clutch
	Appreciate 0 Tweet Quote

02-03-2015, 11:06 AM	#2
itsstock02 First Lieutenant 20 Rep 326 Posts Drives: 2008 335i Join Date: Aug 2013 Location: MI iTrader: (2)	Im going to do my plugs as soon as it warms up. I have the same cold start hesitation as you. I have new injectors too, but im curious if the plugs will fix the problem.
	Appreciate 0 Quote

02-03-2015, 11:08 AM	#3
BashShah Colonel 296 Rep 2,015 Posts Drives: 2012 335i Sedan Join Date: Oct 2012 Location: Vancouver, Canada iTrader: (0)	Plugs and possibly adaptation reset.
	Appreciate 0 Quote

02-03-2015, 11:14 AM	#4
cotmfk Major General 2051 Rep 6,110 Posts Drives: M3 Join Date: Mar 2009 Location: Somewhere between DC and FL iTrader: (12)	I have heard 15-20k on plugs for tuned/modded cars. __________________ When you say impact instead of affect/effect, you are communicating that you don't understand the difference between the two words, and are too lazy to learn.
	Appreciate 0 Quote

02-03-2015, 01:21 PM	#5
GSEN820 Private First Class 62 Rep 143 Posts Drives: 2011 e92 M3 DCT Join Date: Aug 2011 Location: San Diego,CA iTrader: (2)	^^ that's the rule.....not to thread jack but what about the coil packs __________________ IG @gsen_820
	Appreciate 0 Quote

02-03-2015, 04:52 PM	#6
jeffro535 First Lieutenant 16 Rep 311 Posts Drives: 2020 M340i, 2019 X3M40 Join Date: Feb 2012 Location: SoCal iTrader: (0)	This motor is seems really finicky so doesn't surprise me. Dealer did plugs at 28k miles in the course of troubleshooting a hesitation and I changed them and the coils at 53k and reset the adaptations and it seemed to make a difference.
	Appreciate 0 Quote

02-03-2015, 08:27 PM	#8
John 070 Lieutenant General 1705 Rep 14,829 Posts Drives: 335i cpe Join Date: Oct 2006 Location: ZSP/ZPP/ZCW iTrader: (0)	I did mine at 41k, no difference, to each his own.
	Appreciate 0 Quote

02-03-2015, 09:10 PM	#9
Miller335 Colonel 291 Rep 2,189 Posts Drives: 2007 E92 Join Date: Oct 2013 Location: Portland, OR iTrader: (0)	My plan is every 10K/every other oil change. __________________ 2007 E92 335 6MT w/335is clutch FBO MHD E60 Wedge map 49k miles
	Appreciate 0 Quote