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The Boy

Member Since: 28 Aug 2008
Location: East Northants
Posts: 1459

2009 Defender 110 Puma 2.4 XS CSW Rimini Red

Strangly I am seeing little difference running with the egr closed. MPG is more or less the same. this is with a standard tune. Only whne I got rid of the cat and had the new exhaust fitted did i see an improvment.

Do you think it is wise every 3 months to run it with the egr normally for a couple of weeks?

9th Jul 2012 2:57pm

Naks

Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2637

2010 Defender 90 Puma 2.4 SW Alpine White

The Boy wrote:
Strangly I am seeing little difference running with the egr closed. MPG is more or less the same. this is with a standard tune. Only whne I got rid of the cat and had the new exhaust fitted did i see an improvment.

Hmmm, what diesel are you using? Our diesel in S.Africa is only 50ppm.

Quote:
Do you think it is wise every 3 months to run it with the egr normally for a couple of weeks?

It can't hurt

--
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged

Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

9th Jul 2012 3:16pm

Ninetenths

Member Since: 26 Mar 2009
Location: Sarf Lundun
Posts: 161

2007 Defender 110 Puma 2.4 XS CSW Java Black

If your EGR valve is sticking it is possible to clear with a bit of brute force and ignorance ie whack it a few times with a hammer. Pimped black '07 Puma
Equally Pimped Black Pick up Truck

Rollin deep

15th Jul 2012 7:02pm

Andrea

Member Since: 02 Sep 2010
Location: South Africa
Posts: 30

Hey naks,

Help me out here mate.

what is this thing with the EGR closed?? I read this and don't know what's going on? As you know my 09 puma is out of warranty! What is the EGR? Why should one close it?

Please excuse my ignorance!

Andrea

18th Jul 2012 4:27pm

Andrea

Member Since: 02 Sep 2010
Location: South Africa
Posts: 30

Hey naks,

Help me out here mate.

18th Jul 2012 4:29pm

Naks

Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2637

Andrea wrote:
Help me out here mate. what is this thing with the EGR closed?? I read this and don't know what's going on? As you know my 09 puma is out of warranty! What is the EGR? Why should one close it?

The EGR is basically a system where the exhaust gas is fed back into the engine to reduce combustion temperatures and thereby reducing harmful emissions. Some more info here: http://en.wikipedia.org/wiki/Exhaust_gas_recirculation

However, it is bad because it increases fuel consumption and over time the intake manifold gets fouled up, EGR valve becomes clogged, etc.

So it's generally a good idea to remove the EGR on a TDi. Unfortunately on the Puma the EGR is controlled by the ECU and if you remove/bypass it, the Engine Malfunction Light will come on and stay on.

So the BAS/Alive remap basically tells the ECU to keep the EGR closed and the net result is that your engine runs cleaner and fuel consumption is bettered.

IIRC, there is a russian fellow who has removed the EGR completely, search around for this thread, it may be worth considering. --
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged

Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

19th Jul 2012 10:01am

Molusk

Member Since: 20 Dec 2011
Location: Loire Valley
Posts: 43

2008 Defender 130 Puma 2.4 HCPU Alpine White

and what if we just unplug the EGR connector? MIL lights, OK, but does the engine still work fine with EGR disconnected? Is there any risk? Does the ECU fall into degraded mode?

19th Jul 2012 11:11am

Naks

Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2637

Molusk wrote:
and what if we just unplug the EGR connector? MIL lights, OK, but does the engine still work fine with EGR disconnected? Is there any risk? Does the ECU fall into degraded mode?

Engine will work fine, in fact, it will run better.

BUT if the MIL light is always on, when will you know if something really goes go wrong?

--
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged

Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

19th Jul 2012 11:17am

tatra805

Member Since: 16 Aug 2011
Location: Dolany
Posts: 436

2008 Defender 110 Puma 2.4 CSW Bonatti Grey

and dont forget that by pulling the EGR plug the ECU will calculate on average maps for fuel/air mixture as if the EGR is broken and has no influence.

While a lot of people reported less consumption with the EGR unplugged i am 2 liters/100km down since plugging it back in. (a lot of towing)

I would only consider a software patch or a real "mechanical" solution that fools the ECU in believing all is functional.

2cents

19th Jul 2012 11:24am

Molusk

Member Since: 20 Dec 2011
Location: Loire Valley
Posts: 43

Naks wrote:

BUT if the MIL light is always on, when will you know if something really goes go wrong?

Good point.
But for what kind of reason does the MIL occur?
I guess when there is a deadly issue (oil pressure, water T°C) you'll have a another red light on the dashboard, am I wrong?
So as long as the engine drives well, what is the matter with having the MIL ON?

23rd Jul 2012 8:43am

Molusk

Member Since: 20 Dec 2011
Location: Loire Valley
Posts: 43

tatra805 wrote:
and dont forget that by pulling the EGR plug the ECU will calculate on average maps for fuel/air mixture as if the EGR is broken and has no influence.

You mean the ECM will take into account that EGR is out of order for its mixture management. Seems to be perfect, as it is the case indeed.
What is wrong with that?

23rd Jul 2012 8:47am

Naks

Member Since: 27 Jan 2009
Location: Stellenbosch, ZA
Posts: 2637

Molusk wrote:
But for what kind of reason does the MIL occur?

Anything serious I would think?

Quote:
I guess when there is a deadly issue (oil pressure, water T°C) you'll have a another red light on the dashboard, am I wrong?

I could be wrong, but I don't think there's any other light that comes on?

In my case I have a Madman EMS, so if engine oil pressure/coolant level/coolant temp/EGT are abnormal, I have a backup alarm. It is a good idea to get one of these, since you can monitor real-time figures and not rely on the ECU's alarm.

Quote:
So as long as the engine drives well, what is the matter with having the MIL ON?

Nothing

--
2010 Defender Puma 90 + BAS remap + Alive IC + Slickshift + Ashcroft ATB rear
2015 Range Rover Sport V8 Supercharged

Defender Puma Workshop Manual: https://bit.ly/2zZ1en9
Discovery 4 Workshop Manual: https://bit.ly/2zXrtKO
Range Rover/Sport L320/L322/L494 Workshop Manual: https://bit.ly/2zc58JQ

23rd Jul 2012 8:51am

Andrea

Member Since: 02 Sep 2010
Location: South Africa
Posts: 30

Naks, thanks for the info!!!

This is something i havent heard of at all! Where do i find the EGR valve to unplug??

27th Jul 2012 3:04pm

Marius

Member Since: 21 Dec 2010
Location: South Africa
Posts: 231

2011 Defender 110 Puma 2.4 SW Keswick Green

Reviving this post. I wana unplug my ERG and run it for a bit to see fuel consumption?

Any negatives appart from the warning light?
Does this light (fault) clear itself once plugged back?

19th Feb 2014 12:55pm

gpauloj

Member Since: 13 Dec 2014
Location: evian
Posts: 4

hello, if i understand well, i can unplug my egr valve , i'll only get light on dashbord? but i hurd, after 3 times running engine, default stays in ECU and your engine run in downgraded mode, true?

13th Dec 2014 2:10am

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