320D lumpy start

jinjur · 02-02-2010, 03:17 AM

I have noticed more and more of late, our 320D starts up REALLY lumpy in the mornings.

Not necessarily in the ridiculous cold mornings (even though it did sound like it was on 1 cylinder then) but even these milder mornings......it splutters and blatters for like 30 seconds and then its fine.

I dont EVER remember it doing that before.

Now......could this be down to the remap?

What else could be causing this?

It doesnt feel very BMW when it starts like a Massey Ferguson.

I am contemplating getting it un-mapped this week as i am worrying about things breaking and i have convinced myself that the engine is more rattly after a year of driving it remapped.

I would also like to point out that i do listen to the engine FAR too much and its probably fine.

Any and all advice appreciated chaps

Regards
Andy

HighlandPete · 02-02-2010, 05:09 AM

Glowplug(s) glowplug control are possible candidates. It can also be a typical sign of injector wear and/or poor spray pattern, often smooths as you warm. But as you mention the engine rattles more, I assume you mean combustion knock, not a mechanical knock, it is likely injector issues.

Wise to have a diagnostic check. Smooth running and leak off tests could be needed once you have some indication if it is injector related. If it is glowplugs, that will show up as well.

HighlandPete

jinjur · 02-02-2010, 06:00 AM

Oh Noes.....

Is that a BMW job Pete?

Regards
Andy

xenon · 02-02-2010, 10:51 AM

Glowplug relay is my bet.

jinjur · 02-02-2010, 01:48 PM

Driving home tonight....its definately more clattery....

Even when warm.

02-02-2010, 03:17 AM	#1
jinjur yes....spelt with J's 55 Rep 963 Posts Drives: F31 325D MSport Join Date: Jan 2009 Location: NoRtH eYeLaNd iTrader: (0)	320D lumpy start I have noticed more and more of late, our 320D starts up REALLY lumpy in the mornings. Not necessarily in the ridiculous cold mornings (even though it did sound like it was on 1 cylinder then) but even these milder mornings......it splutters and blatters for like 30 seconds and then its fine. I dont EVER remember it doing that before. Now......could this be down to the remap? What else could be causing this? It doesnt feel very BMW when it starts like a Massey Ferguson. I am contemplating getting it un-mapped this week as i am worrying about things breaking and i have convinced myself that the engine is more rattly after a year of driving it remapped. I would also like to point out that i do listen to the engine FAR too much and its probably fine. Any and all advice appreciated chaps Regards Andy
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02-02-2010, 05:09 AM	#2
HighlandPete Lieutenant General 6659 Rep 15,858 Posts Drives: BMW F11 535i Touring Join Date: Mar 2007 Location: Scotland, Highland Region iTrader: (0)	Glowplug(s) glowplug control are possible candidates. It can also be a typical sign of injector wear and/or poor spray pattern, often smooths as you warm. But as you mention the engine rattles more, I assume you mean combustion knock, not a mechanical knock, it is likely injector issues. Wise to have a diagnostic check. Smooth running and leak off tests could be needed once you have some indication if it is injector related. If it is glowplugs, that will show up as well. HighlandPete
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02-02-2010, 06:00 AM	#3
jinjur yes....spelt with J's 55 Rep 963 Posts Drives: F31 325D MSport Join Date: Jan 2009 Location: NoRtH eYeLaNd iTrader: (0)	Oh Noes..... Is that a BMW job Pete? Regards Andy
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02-02-2010, 10:51 AM	#4
xenon Major General 1397 Rep 8,083 Posts Drives: 2021 G21 330i M-Sport Join Date: Jun 2008 Location: Coventry iTrader: (0)	Glowplug relay is my bet. __________________ Ian Current: 2021 G21 330i M-Sport Previous: 2018 A6 Avant S-Line MMI+, 2014 F31 320d M-Sport, 2013 F10 520d M-Sport, 2011 F10 530d M-Sport, 2008 320i M-Sport Coupe, 2002 325i, 2001 318i valvetronic, 1998 318i, 1996 525i, 1990 Porsche 944S2
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02-02-2010, 01:48 PM	#5
jinjur yes....spelt with J's 55 Rep 963 Posts Drives: F31 325D MSport Join Date: Jan 2009 Location: NoRtH eYeLaNd iTrader: (0)	Driving home tonight....its definately more clattery.... Even when warm.
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