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Left and right cylinder bank imbalance
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gilesharrison
 


Member Since: 23 Oct 2016
Location: Penrith
Posts: 143

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3
Left and right cylinder bank imbalance

My TDV6 (EU3) has all new Siemens injectors which I installed about 3 months ago. Prior to the new injectors, the compensation values were all over the place but the left and right bank of cylinders were similar.

When I check the compensation values of my new injectors with my IID, I'm getting differing levels on the two banks.
Injectors 1,3,5 (right bank) are all close to 1200
Injectors 2,4,6 ( left bank) are all close to 800

I'm getting no relevant fault codes. There's no signs of a head gasket failure (coolant clear, no scum under oil cap or on dipstick).

Clearly something isn't right here although the engine is running fine. Could this be a problems with a sensor somewhere? Any pointers?
  
Post #181722120th May 2017 8:44 pm
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gilesharrison
 


Member Since: 23 Oct 2016
Location: Penrith
Posts: 143

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

Thought I'd just check out cold injector values. This is what I got.



I also found the following error codes:

P0404-00 (2F) Exhaust gas recirculation control - circuit range/performance
P029E-00 (28) Cylinder 2 balance - fuel trim at maximum limit
P121A-00 (68) Cylinder balance – injector restricted
P02A7-00 (28) Cylinder 4 balance - fuel trim at minimum limit
P029A-00 (28) Cylinder 1 balance - fuel trim at maximum limit

EGRs are blanked, by the way.
  
Post #181740021st May 2017 2:06 pm
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geoff.
 


Member Since: 24 Jan 2010
Location: West kent
Posts: 8531

England 

this might help

Click image to enlarge



i.d be looking at injector 3 & 5
  
Post #181744521st May 2017 4:38 pm
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20713

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

Seems odd that all 3 injectors are reading high on the same bank Confused

I wonder if it would be worth checking the cam timing? How long ago was the belt replaced?
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Post #181749121st May 2017 6:44 pm
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gilesharrison
 


Member Since: 23 Oct 2016
Location: Penrith
Posts: 143

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

All the injectors are new so I'm hoping they're not faulty. Do you think there would be any merit in swapping a couple of injectors around, say injector 1 and 2 and seeing what happens?

I hadn't considered the timing at all. I have a receipt for a belt replacement about 40k miles ago. It was done before I owned the car. Looks like a local general garage, not a LR specialist. I could be tempted to do a DIY replacement on the timing belt if you think it might help? Are you thinking the belt might be a tooth out?

I really appreciate your advice on this.

One more thing, I don't know if this would be relevant to timing problems. I do get some white smoke on cold starts for the first couple of minutes. Not glow plugs (all working), shouldn't be injectors (as they're new).

Thanks again.
  
Post #181751921st May 2017 8:09 pm
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Disco_Mikey
 


Member Since: 29 May 2007
Location: Dundee, Scotland
Posts: 20713

Scotland 2005 Discovery 3 TDV6 HSE Auto Cairns BlueDiscovery 3

New injectors shouldn't give issues, but it's always a possibility

For one bank only to be out, I do wonder if one of the cams is a tooth out...
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Post #181752921st May 2017 8:29 pm
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gilesharrison
 


Member Since: 23 Oct 2016
Location: Penrith
Posts: 143

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

So I'll try replacing the cambelt kit and reset the timing (using the cam belt tools and the starter motor pin).

I won't get this done for 2 or 3 weeks but I'll report back with results.

Thank you for your assistance. It's greatly appreciated!
  
Post #181754421st May 2017 9:19 pm
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ThamesD3
 


Member Since: 10 Oct 2016
Location: Penamacor, Portugal
Posts: 42

Portugal 2005 Discovery 3 TDV6 SE Manual Zambezi SilverDiscovery 3

It could be a cam chain tensioner problem on one bank. On my EU3 engine (140k miles) the lower fixed nylon guide broke up and most of the bits ended up in the sump. There is enough travel on the sprung top nylon guide to still tension the chain and for the engine to continue running okay.
One cam out of time = lower compression on that bank = injector trim offset between the two banks.
Its a easy job to take the sump of to check for the bits.

I will post a picture of the guide / bits in a few days
  
Post #183169528th Jun 2017 8:30 pm
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ThamesD3
 


Member Since: 10 Oct 2016
Location: Penamacor, Portugal
Posts: 42

Portugal 2005 Discovery 3 TDV6 SE Manual Zambezi SilverDiscovery 3

Here is a picture of my cam chain tensioners. Left one is okay, the nylon guide clips on to the centre section. On the right one the nylon guide broke up then the chain wore through the casting exposing the oil way. The engine ran okay but had a top end rattle for a few seconds on start up. All okay now Smile

  
Post #18324431st Jul 2017 12:11 pm
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gilesharrison
 


Member Since: 23 Oct 2016
Location: Penrith
Posts: 143

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Buckingham BlueDiscovery 3

Wow, that's a mess.

Presume the body has to come off to change those?
  
Post #18324581st Jul 2017 1:17 pm
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ThamesD3
 


Member Since: 10 Oct 2016
Location: Penamacor, Portugal
Posts: 42

Portugal 2005 Discovery 3 TDV6 SE Manual Zambezi SilverDiscovery 3

You can remove the inlet cams to change the tensioners with the body on but to change the chains as well would probably mean body off.
The chains would require exhaust cams, vac pump, hpfp belt, cam belt plus their sprockets to come off.
Starts to get expensive or time consuming.
I have just bought an IId tool and checked my injector offsets. All good now. Smile
  
Post #18328102nd Jul 2017 5:54 pm
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