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Very smokey - Diagnosis help
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Ja9uar
 


Member Since: 09 Jan 2021
Location: Daventry
Posts: 24

United Kingdom 2005 Discovery 3 TDV6 S Auto Arctic FrostDiscovery 3
Very smokey - Diagnosis help

Hi all,

I was hoping for another set of eyes on my symptons to try a diagnose an issue I'm having. I've recently gotten my hands on my first D3. Bought from auction unseen, but for the price was worth the risk even if I ended up breaking it. I have little experience with D3's or diesels for that matter.

Car
'05 D3 2.7TDV6 with 125k miles
Still has EGR system

Symptons
-Smokey at idle and revving. Very smokey (billowing) when I do a 1st gear pull down my steet (No MOT so proper test drive not possible). I would say whiteish grey smoke, but I have difficulty distinguising between blue and grey. Power seems good, seems to boost okay on the short run.
-Starts well, although takes maybe a second or 2 to catch
-Maybe a very slight rough idle (although my butt isn't tuned to diesels)
-Coloured watery brown discharge from exhaust after idling for a while

Click image to enlarge


Click image to enlarge


Video link to it running smokey https://i.imgur.com/SRaCwfK.mp4

Fault Codes
Still learning how to use the SDD software but got these
-P029B-00 - Cylinder 1 balance - fuel trim at minimum level
-P02AE-00 - Cylinder 6 balance - fuel trim at maximum level

I pulled up the fuel injector balance trim and get the values below
1=608, 2=1.15k, 3=1.13k, 4=1.08k. 5=947, 6=1.17k
Click image to enlarge

All values got to 1K when adding revs.

My diagnosis
I thought turbo at first, but after pulling the codes, I'm leaning (wink wink) towards an iffy injector. Looks more like Injector 1 may be adding too much fuel. Not sure about 6, as trim values look okay. Would love to hear some thoughts on this before I go and get a replacement injector. Will a faulty injector cause a smoke screen down my street? I'm really looking forward to getting this sorted and experiecning the Disco lifestyle
  
Post #220073110th Jan 2021 2:00 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

Yes duff injector can cause serious white smoke issues at idle.

I would go for injector, get a cheap seoond hand set and fit them, if smoke stops you know you are on the right tracks.
Then you can splash the cash.

Be aware passenger side rear injector is a swine to remove/refit.
  
Post #220073510th Jan 2021 2:12 pm
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Ja9uar
 


Member Since: 09 Jan 2021
Location: Daventry
Posts: 24

United Kingdom 2005 Discovery 3 TDV6 S Auto Arctic FrostDiscovery 3

That's promising. I've ordered a tested injector and will swap cylinder 1. From the diagram, this seems to be drivers front injector. I will update in a couple of days time once the injector and seal arrives.
  
Post #220076210th Jan 2021 3:33 pm
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M3DPO
 


Member Since: 22 Sep 2010
Location: Notts.
Posts: 8041

England 2014 Discovery 4 3.0 SDV6 HSE Lux Auto Corris GreyDiscovery 4

No.1 is definitely low, others are ok, they should be 1000 at tickover, measurement can only be taken at tickover.
Change number 1 and check again as the following injector by firing order can compensate, be sure to replace with a correct injector as they changed around 07my.
Check the large turbo hose for splits, common cause for smoking under acceleration.


 It can when others can't,
It will when others won't,
It goes where others don't. 
 
Post #220083310th Jan 2021 7:38 pm
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Ja9uar
 


Member Since: 09 Jan 2021
Location: Daventry
Posts: 24

United Kingdom 2005 Discovery 3 TDV6 S Auto Arctic FrostDiscovery 3

The injector and seals arrived early, so been tinkering in the rain this afternoon. No bueno. Replaced no. 1 injector which wasn't seized fortunately, but it's still smoking like a 1920s speakeasy.
Trim values are now different
Cold 1=881 2=1120 3=1020 4=1000 5=896 6=1090
Warm 1=1025 2=1050 3=907 4=944 5=812 6=1050
Seems to be normal?

Leaning away from injector issue and towards turbo now. I'll check for any leaks in the boost pipes when my gf finishes work and I can get her to rev my engine. If worse comes to worse, I don't mind changing the turbo myself, but I want to make sure the fault has been identified.
  
Post #220177513th Jan 2021 5:15 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10335

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

clear the fault codes.
run it up till its warm. (takes a while for the fuel in the exhaust to burn off) It may get worse before it gets better.

Keep checking fault codes to see if the inballance returns. (may as well turn engine off if its does)


If you suspect oil getting into the intake system from turbo, these engines will idle with the top air pipe disconnected.
This will eliminate oil thru main intake.

There is still the breather and exhaust though
 

Last edited by Pete K on 13th Jan 2021 5:48 pm. Edited 1 time in total 
Post #220178513th Jan 2021 5:46 pm
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Ja9uar
 


Member Since: 09 Jan 2021
Location: Daventry
Posts: 24

United Kingdom 2005 Discovery 3 TDV6 S Auto Arctic FrostDiscovery 3

Found one leak, but it was from the airbox to TB housing, as I had fitted the clip improperly on reassembly. Couldn't find any other big boost leaks. A small patch of oil on the bottom of the intercooler pipe indicates a small leak, but I doubt it's big enough to be causing this much smoking.
  
Post #220178613th Jan 2021 5:48 pm
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Ja9uar
 


Member Since: 09 Jan 2021
Location: Daventry
Posts: 24

United Kingdom 2005 Discovery 3 TDV6 S Auto Arctic FrostDiscovery 3

Pete K wrote:
clear the fault codes.
run it up till its warm. (takes a while for the fuel in the exhaust to burn off) It may get worse before it gets better.

Keep checking fault codes to see if the inballance returns. (may as well turn engine off if its does)


If you suspect oil getting into the intake system from turbo, these engines will idle with the top air pipe disconnected.
This will eliminate oil thru main intake.

There is still the breather and exhaust though


I will try that when light returns in the morning. As an added point, I've done the EGR delete kit as I had to remove the EGR pipe anyway to get to the injector. I cleared the fault codes and the imbalance ones haven't returned yet. Will fully warm it up first and sneakily go up and down my street.
  
Post #220179013th Jan 2021 5:52 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10335

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

I wonder if cylinder 6 has a compression problem
  
Post #220179513th Jan 2021 6:05 pm
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Ja9uar
 


Member Since: 09 Jan 2021
Location: Daventry
Posts: 24

United Kingdom 2005 Discovery 3 TDV6 S Auto Arctic FrostDiscovery 3

What's the thinking behind that?
  
Post #220180813th Jan 2021 6:32 pm
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Ja9uar
 


Member Since: 09 Jan 2021
Location: Daventry
Posts: 24

United Kingdom 2005 Discovery 3 TDV6 S Auto Arctic FrostDiscovery 3

Sooo....I tried disconnecting the boost pipe to the airbox at idle and it was still smoking. I then revved which I assume upset the ECU and it must of gone into a default map. Reconnected the boost pipe, and no smoking. Tried a 1st gear pull, no smoke.

My presumption is that if I clear the codes and restart, it will probably start smoking again. This might be pointing to a metering/sensor issue and when it goes to a safe/limp map it ignores certain measurements(although I never got a check engine light on the dash). I might play around with disconnecting the MAF etc and see if I can turn on and off the smoking.

Has anyone got a check table for all the input values such as pressures, air flow etc that I can check against my data logger values.
  
Post #220282216th Jan 2021 5:04 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10335

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Yeah disconnect the air meter on the filter box and let it use default values


2005 don’t have an ecu light. They put a message up on the display (where it says bonnet open)
  
Post #220282716th Jan 2021 5:12 pm
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Ja9uar
 


Member Since: 09 Jan 2021
Location: Daventry
Posts: 24

United Kingdom 2005 Discovery 3 TDV6 S Auto Arctic FrostDiscovery 3

Well no more smoking. I think I've traced it to the IAT so will be replacing that. The smoking will stop if I disconnect a sensor to trigger the base map. Also replaced the old boost pipe which wasn't leaking and the passenger door latch today so all ready for an MOT! Let's ee the result on Wednesday
  
Post #220337218th Jan 2021 3:42 pm
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aja4x4
 


Member Since: 14 Apr 2019
Location: Westbury
Posts: 2459

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zambezi SilverDiscovery 3

Sorry what is IAT?
  
Post #220341418th Jan 2021 5:31 pm
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Ja9uar
 


Member Since: 09 Jan 2021
Location: Daventry
Posts: 24

United Kingdom 2005 Discovery 3 TDV6 S Auto Arctic FrostDiscovery 3

Intake air temperature
  
Post #220349118th Jan 2021 9:16 pm
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