2007 320d Flat Spot

NIGEL288 · 06-09-2011, 04:41 PM

Recently purchased a 320d that as apparently been remapped (not sure if this is good or bad)
It as a flat spot noticible in 2nd and 3rd anywhere between 1.5 to 2.5 revs only for a split second then its fine when it gets past it.
Any ideas please?

MEGA · 06-09-2011, 07:14 PM

Could be a few things. Most likely the MAF sensor. Air filter doesn't help either (And mapped car would need the air filter replaced sooner than non mapped).

Other possible cause is EGR thermostat or the turbo actuator. The latter is the only particularly expensive cause.

I'm going through the exact same thing right now. Just had all 4 glow plugs replaced which didn't help (under warranty fortunately) but BMW won't replace the MAF so I'm looking into ordering one of those myself now and getting it fitted along with a new air filter..

jinjur · 06-10-2011, 02:56 AM

I didnt think there was an actuator on these cars chap.....

Certainly wasnt on ours which was a 2005 one.

Seems to all be done by the VNT system and electronics

Though, the VNT system is supposed to stick occasionally.

J

MEGA · 06-10-2011, 03:38 AM

Quote:

Originally Posted by jinjur

I didnt think there was an actuator on these cars chap.....

Certainly wasnt on ours which was a 2005 one.

Seems to all be done by the VNT system and electronics

Though, the VNT system is supposed to stick occasionally.

J

Ah. Yes sorry I meant the electronic valve jobber. I didn't know what it was called

NIGEL288 · 06-10-2011, 06:21 AM

Thanks

I'll start with the filter then and work up.
I had a tdi and the vaned were sticking.
But this power loss is only just noticeable

NIGEL288 · 06-12-2011, 04:01 AM

Sorry for the spelling
I meant to say Golf tdi vanes.

06-09-2011, 04:41 PM	#1
NIGEL288 New Member 9 Rep 22 Posts Drives: BMW 320D 2007 Join Date: May 2011 Location: SHEFFIELD UK iTrader: (0)	2007 320d Flat Spot Recently purchased a 320d that as apparently been remapped (not sure if this is good or bad) It as a flat spot noticible in 2nd and 3rd anywhere between 1.5 to 2.5 revs only for a split second then its fine when it gets past it. Any ideas please?
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06-09-2011, 07:14 PM	#2
MEGA Dieseasal 204 Rep 6,881 Posts Drives: LCI E92 335d M-Sport Join Date: Jan 2009 Location: Harrow, London iTrader: (2)	Could be a few things. Most likely the MAF sensor. Air filter doesn't help either (And mapped car would need the air filter replaced sooner than non mapped). Other possible cause is EGR thermostat or the turbo actuator. The latter is the only particularly expensive cause. I'm going through the exact same thing right now. Just had all 4 glow plugs replaced which didn't help (under warranty fortunately) but BMW won't replace the MAF so I'm looking into ordering one of those myself now and getting it fitted along with a new air filter.. __________________ Previously: 2003 Peugeot 206 1.6 8v \| 2006 E90 320d M-Sport, 19" BBS CH, Full Ice-cold JL audio install, August 2010 Total BMW 6 page feature car. \| 2003 Nissan 350Z GT Coupe 286BHP Now:2010 E92 LCI 335d M-Sport
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06-10-2011, 02:56 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)	I didnt think there was an actuator on these cars chap..... Certainly wasnt on ours which was a 2005 one. Seems to all be done by the VNT system and electronics Though, the VNT system is supposed to stick occasionally. J
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06-10-2011, 06:21 AM	#5
NIGEL288 New Member 9 Rep 22 Posts Drives: BMW 320D 2007 Join Date: May 2011 Location: SHEFFIELD UK iTrader: (0)	Thanks I'll start with the filter then and work up. I had a tdi and the vaned were sticking. But this power loss is only just noticeable
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06-12-2011, 04:01 AM	#6
NIGEL288 New Member 9 Rep 22 Posts Drives: BMW 320D 2007 Join Date: May 2011 Location: SHEFFIELD UK iTrader: (0)	Sorry for the spelling I meant to say Golf tdi vanes.
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