EGR , smoke and loss of power!!

blucoop · 06-30-2015, 04:54 PM

just wondering if anyone can shed any light on some issues I've been having.

Firstly my 2007 330d, started to kick out grey smoke all through the Rev range.

With the help of a friend I have cleaned the egr thoroughly and it has made no difference. However... If I remove and plug the egr vacuum pipe then the smoke goes completely.! Put it back on and the smoke comes back.

The newer problem is a big loss of low down power. The car struggles up the slightest hill, and the auto box is really delayed in changing gear. If I plant my foot it doesn't seem so bad over 3000 odd revs but definitely not 100%.

I have inpa and dis software but only faults I get is glow plug on cylinder 3 , and a fuel filter code (despite changing it twice).

I have tried disconnecting the maf, which made no difference .

Car is going in to garage on Friday but I have little faith in so called mechanics these days due to reasons which I won't go into. So I was just hoping to get as much info on board before then.

Any help much appreciated .

Cheers

jackstrath · 06-30-2015, 05:35 PM

colour is the smoke ? does it struggle to start and is it using water?

Aragorn30d · 07-01-2015, 05:22 AM

black smoke on a diesel results from too rich a fuel mixture.

Given it only happens with the EGR connected, that would suggest the EGR valve is staying open for some reason, allowing boost pressure to leak out into the exhaust, and as a result it injects far too much fuel for the amount of air thats left.

Assuming the valve is working, perhaps theres an issue with the EGR solenoid valve that opens and closes the vacuum feed? Does the power seem normal when the EGR is disconnected and the smoke is gone?

Does the car still have a DPF? Sounds a bit odd for it to be pouring out smoke if the DPF is still there.

blucoop · 07-01-2015, 07:40 AM

Hi and thanks for the replies. The smoke is a grey colour, not as dark as when you boot it but certainly not white.

Car is not using water as far as I can tell.

Dpf has been removed and car remapped.

With the egr vacuum disconnected there seems to be more power but certainly not 100% or even close. Gears are still very delayed to change.

Is there a way to check the solenoid ?

Could it be to do with the map sensor ?

Cheers

Steve

blucoop · 07-15-2015, 04:33 PM

Just wondered if anyone else could shed any more light on this one?? Ive wasted the best part of £200 at two different garages and both say they cant find an issue.??

I have since tried unplugging the MAP sensor which made no change.

Can anyone give any more info on the egr system?? what is it that controlls the egr opening and closing?

The valve itself has been checked and seems ok but if it is opening at the wrong times (if possible) what could cause it to do this?

Really could do with some help as at the minute im wasting money looking in the wrong places.

Cheers

Steve

Aragorn30d · 07-15-2015, 05:52 PM

Theres a solenoid controlled by the ECU that switches the vacuum feed to the EGR unit, enabling the ECU to open it when it wants it. Its right next to the EGR valve, follow the hose and it goes straight to it.

Perhaps the solenoid is jammed open?

ade146 · 08-05-2015, 05:33 AM

Slide a blank into the exhaust side of the egr to test. It will give you an EML but the car drives fine.

06-30-2015, 04:54 PM	#1
blucoop Enlisted Member 6 Rep 35 Posts Drives: 2007 Le Mans Blue Touring 330d Join Date: Jan 2013 Location: Kent iTrader: (0)	EGR , smoke and loss of power!! just wondering if anyone can shed any light on some issues I've been having. Firstly my 2007 330d, started to kick out grey smoke all through the Rev range. With the help of a friend I have cleaned the egr thoroughly and it has made no difference. However... If I remove and plug the egr vacuum pipe then the smoke goes completely.! Put it back on and the smoke comes back. The newer problem is a big loss of low down power. The car struggles up the slightest hill, and the auto box is really delayed in changing gear. If I plant my foot it doesn't seem so bad over 3000 odd revs but definitely not 100%. I have inpa and dis software but only faults I get is glow plug on cylinder 3 , and a fuel filter code (despite changing it twice). I have tried disconnecting the maf, which made no difference . Car is going in to garage on Friday but I have little faith in so called mechanics these days due to reasons which I won't go into. So I was just hoping to get as much info on board before then. Any help much appreciated . Cheers
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06-30-2015, 05:35 PM	#2
jackstrath Major 667 Rep 1,240 Posts Drives: 16' F31 340i & 03' Focus RS Join Date: Aug 2014 Location: Aberdeen iTrader: (0)	colour is the smoke ? does it struggle to start and is it using water?
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07-01-2015, 05:22 AM	#3
Aragorn30d Lieutenant Colonel 169 Rep 1,596 Posts Drives: E90 330d Join Date: Mar 2015 Location: Fife iTrader: (0)	black smoke on a diesel results from too rich a fuel mixture. Given it only happens with the EGR connected, that would suggest the EGR valve is staying open for some reason, allowing boost pressure to leak out into the exhaust, and as a result it injects far too much fuel for the amount of air thats left. Assuming the valve is working, perhaps theres an issue with the EGR solenoid valve that opens and closes the vacuum feed? Does the power seem normal when the EGR is disconnected and the smoke is gone? Does the car still have a DPF? Sounds a bit odd for it to be pouring out smoke if the DPF is still there.
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07-01-2015, 07:40 AM	#4
blucoop Enlisted Member 6 Rep 35 Posts Drives: 2007 Le Mans Blue Touring 330d Join Date: Jan 2013 Location: Kent iTrader: (0)	Hi and thanks for the replies. The smoke is a grey colour, not as dark as when you boot it but certainly not white. Car is not using water as far as I can tell. Dpf has been removed and car remapped. With the egr vacuum disconnected there seems to be more power but certainly not 100% or even close. Gears are still very delayed to change. Is there a way to check the solenoid ? Could it be to do with the map sensor ? Cheers Steve
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07-15-2015, 04:33 PM	#5
blucoop Enlisted Member 6 Rep 35 Posts Drives: 2007 Le Mans Blue Touring 330d Join Date: Jan 2013 Location: Kent iTrader: (0)	Just wondered if anyone else could shed any more light on this one?? Ive wasted the best part of £200 at two different garages and both say they cant find an issue.?? I have since tried unplugging the MAP sensor which made no change. Can anyone give any more info on the egr system?? what is it that controlls the egr opening and closing? The valve itself has been checked and seems ok but if it is opening at the wrong times (if possible) what could cause it to do this? Really could do with some help as at the minute im wasting money looking in the wrong places. Cheers Steve
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07-15-2015, 05:52 PM	#6
Aragorn30d Lieutenant Colonel 169 Rep 1,596 Posts Drives: E90 330d Join Date: Mar 2015 Location: Fife iTrader: (0)	Theres a solenoid controlled by the ECU that switches the vacuum feed to the EGR unit, enabling the ECU to open it when it wants it. Its right next to the EGR valve, follow the hose and it goes straight to it. Perhaps the solenoid is jammed open?
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08-05-2015, 05:33 AM	#7
ade146 Second Lieutenant 8 Rep 242 Posts Drives: E90 330d sport auto Join Date: Sep 2012 Location: S.Wales or Cheshire iTrader: (0)	Slide a blank into the exhaust side of the egr to test. It will give you an EML but the car drives fine.
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