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V8 D3 LEAN RUNNING LEFT AND RIGHT BANK ??
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v8wds
 


Member Since: 20 Feb 2017
Location: B45 9 EJ
Posts: 5

United Kingdom 2008 Discovery 3 TDV6 XS Auto Cairns BlueDiscovery 3
V8 D3 LEAN RUNNING LEFT AND RIGHT BANK ??

Have the dreaded light from hell again my workshop have told me its left and right bank running lean ?? he said no air leaks and that its possibly stretched timing chains?? when you drive steady at stay 40 mph you can see the oscillation on the rev counter and physically hear the engine tone going up and down ??
any help please
.
thanks
 V8WDS 05 V8 4.4 D3+07 2.7 D3  
Post #18663038th Oct 2017 8:03 pm
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Alphamale
 


Member Since: 28 May 2014
Location: Belfast
Posts: 496

United Kingdom 2014 Discovery 4 3.0 SDV6 HSE Auto Loire BlueDiscovery 4

I've a similar issue with the added problem of high fuel consumption. I have been through all the sensors to check they're functioning ok and have concluded that it may be a faulty MAF. New one on order and hopefully be fitted this week.

Stretched timing chains, while not totally impossible, would be at the bottom of my list of causes as 'Duplex' chains are pretty tough and not prone to that type of damage.

These engines can show lean/rich mixes due to problems with any of the sensors, MAP, CPS, MAF, and O2 sensors. Even dirty or non functioning injectors, low fuel pressure or weak coils could cause similar fault readings as the oxygen levels fluctuate and the O2 sensors read rich then lean as the ECM tries to adapt and get the correct mix.

You need to have the codes read and each of the sensors tested for proper functioning. The last job I'd have done would be new chains as it is a huge job on the V8, front cover need to come off and it takes hours to do.
   
Post #18663208th Oct 2017 8:36 pm
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v8wds
 


Member Since: 20 Feb 2017
Location: B45 9 EJ
Posts: 5

United Kingdom 2008 Discovery 3 TDV6 XS Auto Cairns BlueDiscovery 3

thanks for this will you keep me posted ? i definately am suffering really poor fuel returns Sad
i just didnt quite feel myself that the timing chains was a thing to happen on an 80k engine that has shown no previous issue it just happened a few weeks before service ..
 V8WDS 05 V8 4.4 D3+07 2.7 D3  
Post #18663288th Oct 2017 8:42 pm
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Alphamale
 


Member Since: 28 May 2014
Location: Belfast
Posts: 496

United Kingdom 2014 Discovery 4 3.0 SDV6 HSE Auto Loire BlueDiscovery 4

This is what I'm getting http://www.ebay.co.uk/itm/MASS-AIR-FLOW-ME...Sw9fNZga2Q and at that price is worth a punt.
   
Post #18663418th Oct 2017 9:16 pm
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Charliecloud
 


Member Since: 31 Jul 2014
Location: Tonbridge
Posts: 980

United Kingdom 2005 Discovery 3 4.4 V8 HSE Auto Bonatti GreyDiscovery 3

v8wds wrote:
thanks for this will you keep me posted ? i definately am suffering really poor fuel returns Sad
i just didnt quite feel myself that the timing chains was a thing to happen on an 80k engine that has shown no previous issue it just happened a few weeks before service ..


Try cleaning the MAF and the throttle body. MAF cleaner is cheap and the jobs about 10mins start to finish. Throttle body would take 30 -40mins and requires no specialist tools. There are a few threads on here about how to do it and a few good videos on utube. Thumbs Up
  
Post #18663488th Oct 2017 9:41 pm
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pjm-84
 


Member Since: 04 Oct 2016
Location: Hampshire
Posts: 2406

Ukraine 

+1

Change the PCV value as well whilst you have the TB off.
  
Post #18663558th Oct 2017 9:52 pm
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geoffsnook
 


Member Since: 13 Jun 2014
Location: south wales
Posts: 3169

Wales 

Mine did this for a while i tried a few things including making sure the oil filler cap is on properly and the fuel tank is sealed tightly and my light does not come on anymore but i think the pcv valve is quite cheap Thumbs Up
 Discovery 3 se gone
Range rover sport supercharged here:) 
 
Post #18664129th Oct 2017 7:46 am
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v8wds
 


Member Since: 20 Feb 2017
Location: B45 9 EJ
Posts: 5

United Kingdom 2008 Discovery 3 TDV6 XS Auto Cairns BlueDiscovery 3

thanks guys i will try all of the above have ordered the bits so will see as you all say its cheaper than the alternative and with fuel consuption down to about half of what it was i need to do something ..
Thumbs Up
 V8WDS 05 V8 4.4 D3+07 2.7 D3  
Post #18665849th Oct 2017 3:34 pm
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Eliot34
 


Member Since: 19 Jun 2020
Location: france
Posts: 16

France 2005 Discovery 3 4.4 V8 HSE Auto Barolo BlackDiscovery 3

Hi
Fix?
  
Post #216453630th Jul 2020 10:06 am
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SafariDave
 


Member Since: 19 Nov 2011
Location: NYC & LA
Posts: 775

United States 2005 Discovery 3 4.4 V8 SE Auto Bonatti GreyDiscovery 3

The D3 V8 4.4 tens to be a sturdy reliable engine very few have timing chain issues those who do have been neglected to oil changes, etc. Many here in the states (USA) have over 200K & 300K miles without engine issues.
Dave
 D3 2005 V8 SE Bonatti Grey "The Rhino" (our NYC D3)
De-tangoed Headlights, D4 2016 Style Black Pack Grille, D4 19" Wheels/ Bridgestone Alenza
D3 2005 V8 SE Bonatti Grey, D4 2016 Style Black Pack Grille (our LA D3)
D2 1999 V8 SD7 Chawton White (our Caribbean Beach truck) 
 
Post #216463130th Jul 2020 3:10 pm
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Global Puffin
 


Member Since: 23 Dec 2020
Location: Stirling, Scotland
Posts: 223

United Kingdom 2005 Discovery 3 4.4 V8 S Auto Zambezi SilverDiscovery 3

I have had this code pop up a couple of times this week.


Click image to enlarge


Is this a similar issue to the above? I'll try the suggested fixes...
 2005 D3 V8
2010 MX-5
www.instagram.com/global_puffin 
 
Post #223803524th Jun 2021 10:11 am
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