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Smoke
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Patman
 


Member Since: 16 Aug 2019
Location: Cornwall
Posts: 314

United Kingdom 2008 Discovery 3 TDV6 GS Auto Zermatt SilverDiscovery 3
Smoke

Hi all
Yes my D3 had got the dreaded black smoke from exhausts when accelerating. I’ve checked and replaced all the turbo hoses and rechecked them in case. I also cleaned both sensors in the system too. However the smoke whilst reduced still persists. Indeed the engine system fault still comes on dash even without the smoke. Andy suggestions as to a cause gratefully received. I was wondering on blanking the egr valves but that involves a gap iid which I don’t have yet.
Any suggestions taken on board with thanks
Pat n (Derek lr3)
  
Post #218045316th Oct 2020 9:24 am
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4579

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

You will need to have the fault codes read before you can proceed further, otherwise you'll be throwing good money after bad! With a decent diagnostic tool the DTC's will point the direction.
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #218046916th Oct 2020 11:54 am
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Patman
 


Member Since: 16 Aug 2019
Location: Cornwall
Posts: 314

United Kingdom 2008 Discovery 3 TDV6 GS Auto Zermatt SilverDiscovery 3

The reader says p006A/21 mass or volume air flow correlation.
Which points to leak in air system after turbo. I have replaced and checked hoses. Only thing I can think is either intercooler or actual sensor. However in my mind if it was sensor then they’d be no black smoke?
Pat
  
Post #218065217th Oct 2020 3:01 pm
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lynalldiscovery
 


Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274

United Kingdom 2006 Discovery 3 TDV6 Metropolis LE Auto Bonatti GreyDiscovery 3

If egr passing then would that would also casue a mix up in the readings?

As I understand it, post 2007 to blank the egrs you need the blanks and an ecu patch or emulators, but I am sure I have read of people who have done the blanks yet had no lights come on, so for 15 quid it has to be worth a try?
  
Post #218065317th Oct 2020 3:07 pm
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Patman
 


Member Since: 16 Aug 2019
Location: Cornwall
Posts: 314

United Kingdom 2008 Discovery 3 TDV6 GS Auto Zermatt SilverDiscovery 3

Good point lynalldiscovery I’ll bear it in mind. See if anyone else comes up with any ideas.
  
Post #218067117th Oct 2020 4:47 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4579

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Patman wrote:
The reader says p006A/21 mass or volume air flow correlation.
Which points to leak in air system after turbo. I have replaced and checked hoses. Only thing I can think is either intercooler or actual sensor. However in my mind if it was sensor then they’d be no black smoke?
Pat


I'd interpret that as a problem with the MAF sensor as the MAP rarely gives trouble! You could try a MAF cleaner and see if it helps but it might be an idea to disconnect it and see if the PCM will adopt a pre-programmed default value?

Hopefully with no smoke Smile
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #218069717th Oct 2020 6:00 pm
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Patman
 


Member Since: 16 Aug 2019
Location: Cornwall
Posts: 314

United Kingdom 2008 Discovery 3 TDV6 GS Auto Zermatt SilverDiscovery 3

Thanks for that I was thinking of disconnecting the other sensor. So I was nearly right. If I disconnect and it goes to default. It should produce no black smoke is that correct? If so I can replace with new fingers crossed
Thanks again
  
Post #218073917th Oct 2020 8:02 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4579

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

No not necessarily, it might throw all the toys out of the pram and go into limp. You'll have to "suck it and see"!!
Don't forget there may still be a leak between the air box and the inlet manifold plenum, or elsewhere! Make sure the air filter and it's housing are not hiding anything!
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #218074217th Oct 2020 8:11 pm
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Patman
 


Member Since: 16 Aug 2019
Location: Cornwall
Posts: 314

United Kingdom 2008 Discovery 3 TDV6 GS Auto Zermatt SilverDiscovery 3

Well I disconnected the sensor and boy did it make a difference to acceleration and yes no smoke. It has thrown up a fault code yet to read it. Ended up with a flat tyre thanks to a massive screw 😡. So I’m hoping it’s the cure. It did throw black smoke once but not again in 20 miles of driving and it was up a very steep hill. So fingers crossed I might try another clean first see what happens 🤞🏼
  
Post #218084418th Oct 2020 2:45 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4579

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Progress!

There are spray cleaners available for the MAF which might sort it. If it does I'd be planning on a new one down the road. Thumbs Up
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #218084818th Oct 2020 2:54 pm
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Patman
 


Member Since: 16 Aug 2019
Location: Cornwall
Posts: 314

United Kingdom 2008 Discovery 3 TDV6 GS Auto Zermatt SilverDiscovery 3

Yes I’ve had to do it before should have realized. Oh well live n learn. I’ve seen them on fleabay for £50 used just not too sure if wise move.
  
Post #218103119th Oct 2020 1:28 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4579

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Don't waste your money with second-hand parts. I think Delphi were the OEM so if be going new. Thumbs Up
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #218104219th Oct 2020 2:43 pm
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Patman
 


Member Since: 16 Aug 2019
Location: Cornwall
Posts: 314

United Kingdom 2008 Discovery 3 TDV6 GS Auto Zermatt SilverDiscovery 3

Well that made difference replaced maf and it’s the same 😕
So I guess the only things left are egr valves and intercooler any tips on either gratefully received.
  
Post #218231925th Oct 2020 12:56 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4579

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

So it looks like you're back to finding a leak either on the intake side or the pressure side. As you know, the black smoke is a result of unburnt fuel due to the air fuel ratio being incorrect. This is confirmed by the DTC "mass or volume/flow correlation"

If you are absolutely certain the hoses are good, you could try a few squirts of brake cleaner on the inlet manifolds with the engine warmed up, and on the intercooler. If the engine note changes it's likely a cracked manifold.
You could also try temporarily blanking the EGR's at the throttle body (I think a UK stg 2p coin will do it) and see if that helps. (Do you have DTC's for the EGR's?)
You can then get the kit and blank them as well as removing the throttle butterfly, the EML will come on although it should drive fine until you fit the patch via a GAP IID.

Sometimes code readers don't tell the whole story either depending on the quality of the tool. I don't know what you are using but just be aware of this! Most on here use the GAP IID for good reason, or other quality diagnostics.
 yµ (idµ - eAµ) ψ=mψ

 
 
Post #218233925th Oct 2020 1:56 pm
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Patman
 


Member Since: 16 Aug 2019
Location: Cornwall
Posts: 314

United Kingdom 2008 Discovery 3 TDV6 GS Auto Zermatt SilverDiscovery 3

I read somewhere you take outlet of egr off the inlet manifold and at Rickover there should be no air movement does that sound right to you?
  
Post #218239125th Oct 2020 5:21 pm
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