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LRDISCO3 not starting in minus temperatures
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Gazellio
 


Member Since: 08 Jan 2011
Location: Chilterns
Posts: 4130

United Kingdom 2009 Discovery 4 TDV6 SE Auto Indus SilverDiscovery 4

Waxing?
  
Post #19212662nd Mar 2018 2:36 pm
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Jenks535
 


Member Since: 01 Mar 2018
Location: Sheffield
Posts: 3

United Kingdom 2005 Discovery 3 TDV6 SE Manual Java BlackDiscovery 3

You'll need to remove the engine cover, then it's near to the front of the engine bay.
Same problem occurred this morning. I'll be keeping a flask in the truck from now on !!
Photo showing location in the gallery.
  
Post #19212942nd Mar 2018 3:38 pm
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darrind
 


Member Since: 04 Jul 2008
Location: In A World of My Own!
Posts: 2863

England 2013 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Waxing - legs or back sack and crack?? Shocked Shocked

Seriously though yes it could but different fuel grades will be effected in differing ways

A colleague has suggested his poor starting was massively improved by filling up with the premium diesels in the very cold weather in 2007/8
 Must stop buying shiny toys....  
Post #19214562nd Mar 2018 8:05 pm
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darrind
 


Member Since: 04 Jul 2008
Location: In A World of My Own!
Posts: 2863

England 2013 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

From the Manual -

The engine coolant temperature sensor is located in the top hose at the coolant manifold junction. The ECT sensor
provides the ECM and the instrument cluster with engine coolant temperature status.
The ECM uses the temperature information for the following functions:
Fueling calculations
Limit engine operation if engine coolant temperature becomes too high
Cooling fan operation
Glow plug activation time.
The instrument cluster uses the temperature information for temperature gauge operation. The engine coolant temperature
signal is also transmitted on the CAN bus by the instrument cluster for use by other systems.
The ECMECT sensor circuit consists of an internal voltage divider circuit which incorporates an NTC thermistor. As the
coolant temperature rises the resistance through the sensor decreases and vice versa. The output from the sensor is the
change in voltage as the thermistor allows more current to pass to earth relative to the temperature of the coolant.
The ECM compares the signal voltage to stored values and adjusts fuel delivery to ensure optimum driveability at all
times. The engine will require more fuel when it is cold to overcome fuel condensing on the cold metal surfaces inside the
combustion chamber. To achieve a richer air/fuel ratio, the ECM extends the injector opening time. As the engine warms up
the air/fuel ratio is leaned off.
 Must stop buying shiny toys....  
Post #19214572nd Mar 2018 8:05 pm
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darrind
 


Member Since: 04 Jul 2008
Location: In A World of My Own!
Posts: 2863

England 2013 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

In Russia some of my customers have told me they put a hairdryer into the air inlet for 5 mins or so before starting another guy told me that his wife fills up two hot water bottles with boiling water and puts them on top of her engine block under a blanket then goes and makes coffee, drinks it in the warm then goes back outside and removes it all and starts the car
 Must stop buying shiny toys....  
Post #19214602nd Mar 2018 8:08 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

Gazellio @ Prestige Cars wrote:
Waxing?


ooops Rolling with laughter

i should have said about diesel waxing , oh blimey that sounds worse Whistle
   
Post #19215572nd Mar 2018 11:24 pm
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gstuart
 


Member Since: 21 Oct 2016
Location: kent
Posts: 13576

United Kingdom 2005 Discovery 3 TDV6 Base 7 Seat Auto Java BlackDiscovery 3

darrind wrote:
Waxing - legs or back sack and crack?? Shocked Shocked

Seriously though yes it could but different fuel grades will be effected in differing ways

A colleague has suggested his poor starting was massively improved by filling up with the premium diesels in the very cold weather in 2007/8


Laughing Thumbs Up

always thought that ref the super diesel having the extra additives helps preventing the waxing of diesel at lower temperatures

in the winter time i’ve done a few tanks of super diesel in between the normal fuel fill ups

plus great info ref the glow plugs etc and how the different systems control them, there was me thinking it was a simple operation Laughing
   
Post #19215592nd Mar 2018 11:30 pm
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GSman17
 


Member Since: 10 Feb 2018
Location: Carterton
Posts: 7

United Kingdom 2005 Discovery 3 3.0 TDV6 HSE Auto Vienna GreenDiscovery 3
FBH

Bodsy wrote:
Sounds like glow plugs failed. I’ve fitted loads of the Altox controller to fire up the FBH to pre warm the engine and stop you having to struggle starting when cold.

I can fit for you or just supply if you want to fit yourself. Thumbs Up

Fire up the Fbh from your phone via app or text or website. Thumbs Up


Im also interested in the heater as my glow plugs are also suffering Sad Cant PM you as new to forum and won't let me PM till I've done 3 posts.
 Loving my D3 55 plate  
Post #19215843rd Mar 2018 6:04 am
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DJBertram
 


Member Since: 08 Feb 2018
Location: Hertfrod
Posts: 10

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Santorini BlackDiscovery 3

Jenks535 can you share where the sensor is? I can’t locate the tarpnidea didn’t work stayed at -4
  
Post #19216173rd Mar 2018 8:57 am
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DJBertram
 


Member Since: 08 Feb 2018
Location: Hertfrod
Posts: 10

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Santorini BlackDiscovery 3

Just seen your response
  
Post #19216213rd Mar 2018 9:04 am
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Erea
 


Member Since: 19 Mar 2012
Location: Munster
Posts: 1509

Ireland 2006 Discovery 3 TDV6 Commercial Manual Zambezi SilverDiscovery 3

No start plenty of smoke last evening. Then I used the hairdryer under the engine cover, After 10 minutes it started instantly. Next time I will just concentrate on that temp sensor and see if heating only that will start the engine Thumbs Up
  
Post #19216263rd Mar 2018 9:21 am
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DJBertram
 


Member Since: 08 Feb 2018
Location: Hertfrod
Posts: 10

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Santorini BlackDiscovery 3

Jenna 535... thank you! It worked, I used the hairdryer for 2 mins on the sensor, put the cover back on, first turn of the key and hey presto!! Does hot water work as well? I was a bit sceptical about pouring water in an electrical sensor... I assume that’s safe????
  
Post #19216303rd Mar 2018 9:27 am
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Erea
 


Member Since: 19 Mar 2012
Location: Munster
Posts: 1509

Ireland 2006 Discovery 3 TDV6 Commercial Manual Zambezi SilverDiscovery 3

darrind wrote:
From the Manual -

The engine coolant temperature sensor is located in the top hose at the coolant manifold junction. The ECT sensor
provides the ECM and the instrument cluster with engine coolant temperature status.
The ECM uses the temperature information for the following functions:
Fueling calculations
Limit engine operation if engine coolant temperature becomes too high
Cooling fan operation
Glow plug activation time.
The instrument cluster uses the temperature information for temperature gauge operation. The engine coolant temperature
signal is also transmitted on the CAN bus by the instrument cluster for use by other systems.
The ECMECT sensor circuit consists of an internal voltage divider circuit which incorporates an NTC thermistor. As the
coolant temperature rises the resistance through the sensor decreases and vice versa. The output from the sensor is the
change in voltage as the thermistor allows more current to pass to earth relative to the temperature of the coolant.
The ECM compares the signal voltage to stored values and adjusts fuel delivery to ensure optimum driveability at all
times. The engine will require more fuel when it is cold to overcome fuel condensing on the cold metal surfaces inside the
combustion chamber. To achieve a richer air/fuel ratio, the ECM extends the injector opening time. As the engine warms up
the air/fuel ratio is leaned off.


So quick question is this sensor faulty and would fitting a new one help.
  
Post #19216433rd Mar 2018 10:00 am
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darrind
 


Member Since: 04 Jul 2008
Location: In A World of My Own!
Posts: 2863

England 2013 Discovery 4 3.0 SDV6 HSE Auto Santorini BlackDiscovery 4

Hi

I think the sensor is working correctly as I assume the system doesn't have the ability to realise the glowplugs are FUBAR'd so it assumes the set up needs to be right to utilise them. By putting heat in you are telling the system that its not cold and then it just starts as if it was slightly cool rather than bl**dy cold - although the mixture is wrong, it should start

One other thing that may help is to put the battery on charge overnight if the battery is getting a bit tired it may not be getting full power into the plugs.

Milestone
 Must stop buying shiny toys....  
Post #19221854th Mar 2018 2:15 pm
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DJBertram
 


Member Since: 08 Feb 2018
Location: Hertfrod
Posts: 10

United Kingdom 2005 Discovery 3 TDV6 HSE Auto Santorini BlackDiscovery 3

I have a full bat and it doesn’t work, however..... when using a Sealey RS125 roadstarter, it starts first time every time... thing is I was hoping for a solution without the road starter. One thing to note, when using the road starter pack is it play havoc with the sat nav system for about 10 minutes..
  
Post #19223394th Mar 2018 7:16 pm
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