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Supplementary coolant temp
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Drew0057
 


Member Since: 22 Sep 2021
Location: Devon
Posts: 11

England 2005 Discovery 3 TDV6 SE Manual Bali BlueDiscovery 3
Supplementary coolant temp

Hi all I’ve got a bit of a weird one on my manual disco 3 2005 2.7 diesel. Abit of diesel knock at all times and rubbish mpg. I’ve found this code as in the photo. Is there another temp reading? Or is this just a surplus reading. Any help much appreciated. Also all new injectors not for this issue. They were all fooked cheers  
Post #237506413th Aug 2024 10:25 am
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Gary_P
 


Member Since: 03 May 2016
Location: Kent
Posts: 1596

Ukraine 2016 Discovery 4 3.0 SDV6 HSE Auto Corris GreyDiscovery 4

No photo attached. Gary
-------------------------------------------

Discovery 4 HSE 2016MY  
Post #237506613th Aug 2024 12:42 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10577

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

no photo in your gallery  
Post #237506713th Aug 2024 12:43 pm
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Drew0057
 


Member Since: 22 Sep 2021
Location: Devon
Posts: 11

England 2005 Discovery 3 TDV6 SE Manual Bali BlueDiscovery 3

Should be here
Click image to enlarge
 

Last edited by Drew0057 on 13th Aug 2024 1:09 pm. Edited 1 time in total 
Post #237506913th Aug 2024 1:04 pm
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Drew0057
 


Member Since: 22 Sep 2021
Location: Devon
Posts: 11

England 2005 Discovery 3 TDV6 SE Manual Bali BlueDiscovery 3

Hopefully now  
Post #237507013th Aug 2024 1:06 pm
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Pete K
 


Member Since: 15 Jan 2016
Location: GL
Posts: 10577

England 2005 Discovery 3 TDV6 HSE Auto Rimini RedDiscovery 3

Not seen that before.

It could be for a later engine

Any fault codes  
Post #237507413th Aug 2024 1:32 pm
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Drew0057
 


Member Since: 22 Sep 2021
Location: Devon
Posts: 11

England 2005 Discovery 3 TDV6 SE Manual Bali BlueDiscovery 3

No no fault codes it’s only I noticed that due to the diesel knock I thought ode check injectors and temp sensors as I know some sensors won’t throw up codes. You might be right in saying it’s just a generic temp reading. Just crossing all the ts. There is another thread someone has a similar reading but 140 0c  
Post #237507513th Aug 2024 1:39 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4938

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Drew0057 wrote:
Should be here
Click image to enlarge


It's a reference value for the PCM should the coolant temp sensor or others fail. On a cold engine (typically 20°C in these months) it will normally begin with a value separation of 8-10°C above the "actual" coolant and oil temp values!

(an actual coolant temp of 20°C = supplemental value of around 30°C) This separation will increase as the "actual" value rises, so by the time the engine is running a coolant of 90°C the supplemental will be in the range of 114°C.

Oil temp typically runs a bit behind the coolant temp, eventually catching up or exceeding it depending on conditions. Other parameters are also measured in a similar way, and act as an insurance to prevent engine damage or a dangerous operating environment. Thumbs Up yµ (idµ - eAµ) ψ=mψ

  
Post #237507913th Aug 2024 3:13 pm
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Drew0057
 


Member Since: 22 Sep 2021
Location: Devon
Posts: 11

England 2005 Discovery 3 TDV6 SE Manual Bali BlueDiscovery 3

I get all that. Would you have any advice on where to check next? Thanks for your reply’s 👍🏻  
Post #237508113th Aug 2024 3:34 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4938

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

If you have no fault codes it's tricky to point a direction unless you still have historical codes for the reasons you renewed the injectors.

A faulty injector can and will damage a piston if left for too long, so it could possibly be something like that. However beyond a compression test, injector removal and a borescope is the only way to rule it in or out I'm afraid.

A garage with the right diagnostic equipment (Bosch BEA 850 or similar) and a technician who knows his or her way around it proficiently can do a passive compression test. This uses the starter current drawn for each cylinder compression stroke as a measure of cylinder performance. It's is a very quick, easy and noninvasive test to do once the fuel rail has been run dry, or the diesel EMS has been disabled. It can also be done at home with a digital cable clamp and a diagnostic interface on a lap top. The battery obviously needs to be in good health and fully charged or the results will be skewed. Thumbs Up yµ (idµ - eAµ) ψ=mψ

  
Post #237508213th Aug 2024 4:14 pm
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Drew0057
 


Member Since: 22 Sep 2021
Location: Devon
Posts: 11

England 2005 Discovery 3 TDV6 SE Manual Bali BlueDiscovery 3

It’s been doing it since I got it 3 years ago. I did the injectors due to excess smoke on idle 3 of them were over the limit so changed all 6 after I noticed it. Never skips a beat just the slight knock when accelerating up to 4th gear low revs all other gears perfect. Just towed 400 miles no probs. The noise never gets louder always starts with no smoke not even when putting my foot down. Another thing could be knock sensors? I thought about fuel filter but that was changed last year when I did a big service. Again thanks for your reply’s  
Post #237508313th Aug 2024 4:39 pm
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PROFSR G
 


Member Since: 06 Mar 2017
Location: Lost
Posts: 4938

Ukraine 2009 Discovery 3 TDV6 Commercial XS Auto Stornoway GreyDiscovery 3

Doubt it's a knock sensor as there is a myriad of codes for them if they falter. What do you consider poor mpg? On a long motorway run you should be seeing around 32mpg for a manual and 26mpg for local runs, less if subject to urban traffic.

Is there an aftermarket chip fitted (small black box)? They can often cause a "pinking" sound which was common on petrol cars 30 years ago and beyond. yµ (idµ - eAµ) ψ=mψ

  
Post #237508813th Aug 2024 5:51 pm
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