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simple solution for no glow plugs
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Flapper
 


Member Since: 04 Feb 2015
Location: Gloucester
Posts: 327

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zermatt SilverDiscovery 3
simple solution for no glow plugs

After being told by the garage that all of my glow plugs are stuck and they can't remove them and my fbh not wanting to start using a 1533 timer I thought I need to find a solution for starting in the cold.

Having read a few threads on here I think I have the answer to a cheap solution to starting a d3 or lr3.
I read that you can trick the temp sensor into thinking it's hot then start the engine I have tried this and it works, you have 2 option the wet and dry versions.
Wet is spray hot water on the sensor then start the engine, dry is using a hair dryer on the same sensor. Both work.
So I was having a think and came up with this simple idea.
If I make an extention lead up with a variable resistor in circuit and make it long enough to reach the cab I could ajust the temp by moving the knob on the resistor.
So it would work like this,plug the extension lead into the car run into the cab and back to the sensor,sit in the car when it's cold try to start the car, if it doesn't start adjust the temp by turning the knob start the car turn the knob back down
I just need to get some plugs male and female that match the temp sender.
The sensor is the same one you look at on the dash so you could dial it in so the car thinks it's at normal so no glow plugs and normal spray paternity for the injectors.

Need some help to find the plugs.
 

Last edited by Flapper on 28th Mar 2018 8:24 am. Edited 2 times in total 
Post #193082127th Mar 2018 6:18 pm
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Narpy
 


Member Since: 18 Jul 2011
Location: Stockport
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2005 Discovery 3 TDV6 S Manual Cairns BlueDiscovery 3

Wow, did I really just read that? Shocked
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Post #193082427th Mar 2018 6:26 pm
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rrhool
 


Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4398

United Kingdom 2007 Discovery 3 TDV6 SE Manual Zermatt SilverDiscovery 3

I read it and I still dont understand. I thought the easy way to start a D3 (or LR3) would be to turn the key, and let the very clever electronics start it for you? Maybe I missed something Rolling Eyes
 Richard


D3 SE 2007. Triumph 2.5Pi 1973. Ferguson TEA20 1948.



Discovery 2 4.0 ES 2001- Gone
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Post #193083827th Mar 2018 6:37 pm
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zinke
 


Member Since: 22 Feb 2014
Location: Scunthorpe
Posts: 584

2006 Discovery 3 TDV6 S Manual Zermatt SilverDiscovery 3

Think it would be far easier to fix the problem (from what I gather it’s either faulty glow plugs or faulty sensor) rather than go to all that just form cold start.

Pete.
 IID, webasto software and workshop facility's available.  
Post #193084527th Mar 2018 6:59 pm
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Flapper
 


Member Since: 04 Feb 2015
Location: Gloucester
Posts: 327

United Kingdom 2005 Discovery 3 TDV6 SE Auto Zermatt SilverDiscovery 3
stuck glow plugs

I would so like to be able to start my d3 in the cold without any faffing around but at the moment due to broken and stuck glow plugs this is not happening.

This is where I found the information above using warm air/water on the temp sender (top hose under engine cover) to trick the car into thinking it was warm and then starts. and it does!!!
  
Post #193095828th Mar 2018 8:30 am
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J@mes
 


Member Since: 10 Nov 2008
Location: Bomber County
Posts: 4544

England 2014 Discovery 4 3.0 SDV6 XS Auto Corris GreyDiscovery 4

Why would tricking the car in to thinking it is warm help it start on a cold day?

I don't understand.

Genuine question btw.
  
Post #193096028th Mar 2018 8:33 am
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DSL
Keeper of the wheelie bin 


Member Since: 11 May 2006
Location: Off again! :-)
Posts: 72740

Ukraine 

I thought tricking the car into thinking it's warmer than it actually is resulted in poorer starting as it then didn't deliver enough fuel for a cold start. Confused Confused
   
Post #193096128th Mar 2018 8:40 am
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robpenrose
 


Member Since: 12 Jan 2016
Location: Surrey / SW London
Posts: 2136

United Kingdom 2010 Discovery 4 3.0 TDV6 HSE Auto Stornoway GreyDiscovery 4

J@mes wrote:
Why would tricking the car in to thinking it is warm help it start on a cold day?

I don't understand.

Genuine question btw.


Yes I agree, I don't understand either.

Surely if something is cold, it needs some physical intervention (warming up). How can tricking a sensor help?
 

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Post #193096428th Mar 2018 8:45 am
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J@mes
 


Member Since: 10 Nov 2008
Location: Bomber County
Posts: 4544

England 2014 Discovery 4 3.0 SDV6 XS Auto Corris GreyDiscovery 4

DSL wrote:
I thought tricking the car into thinking it's warmer than it actually is resulted in poorer starting as it then didn't deliver enough fuel for a cold start. Confused Confused


Well this was my experience when I tried to use a Webasto timer in order to bypass my glowplug issues - it warmed the coolant up which then actually reduced the amount of time the glowplugs (that were still working, 2 of 6 IIRC) were on for and caused it to start worse!

This was tested at alpine temperatures -15*c ish.

Confused
  
Post #193096628th Mar 2018 8:50 am
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Jarvis
 


Member Since: 16 Dec 2009
Location: West Berkshire
Posts: 278

England 

I doubt confusing the car into thinking it was hot when it wasn't wouldn't help starting on cold days....you will still end up with cranking for ages and disappear in smoke when it goes Big Cry

My plugs are dead and I've got the fbh on the third fob button. Just have to remember to turn it on 30 minutes before I set off in the morning and the car is on the button Thumbs Up
  
Post #193096728th Mar 2018 8:53 am
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Randylover
 


Member Since: 31 Jan 2011
Location: Staffordshire
Posts: 1172

United Kingdom 2005 Discovery 3 TDV6 S Manual Zermatt SilverDiscovery 3

It does work, during this last recent frosty spell mine failed to start,suspect glow plugs
AA got it going with a small amount of easystart, however I didn’t want to use this much so I tried hot water on to the temp sensor just behind rad under engine cover and I can confirm it does work,
I don’t want to use it long term but it got me sorted this last cold spell until I can look at glow plugs when it’s warmer

Andy
 05 TDV6,"S" in all colourcoded Zermatt silver,7 seats winter pack HK 6cd stereo,Dual climate,Xenons,

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Post #193097028th Mar 2018 9:05 am
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Moo
D3 Decade 


Member Since: 13 Aug 2010
Location: Wiltshire
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Ukraine 2005 Discovery 3 TDV6 S Manual Zambezi SilverDiscovery 3

Why not get an Altox heater thingy from Bodsy or the BAS third key button box doofa for the fbh which is what I have. Much easier.
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Post #193098128th Mar 2018 9:39 am
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J@mes
 


Member Since: 10 Nov 2008
Location: Bomber County
Posts: 4544

England 2014 Discovery 4 3.0 SDV6 XS Auto Corris GreyDiscovery 4

Randylover wrote:
It does work,
Andy


but WHY?! Very Happy Laughing
  
Post #193098428th Mar 2018 9:49 am
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Randylover
 


Member Since: 31 Jan 2011
Location: Staffordshire
Posts: 1172

United Kingdom 2005 Discovery 3 TDV6 S Manual Zermatt SilverDiscovery 3

I don’t know why, can’t answer that but it did
Question
Andy
 05 TDV6,"S" in all colourcoded Zermatt silver,7 seats winter pack HK 6cd stereo,Dual climate,Xenons,

Mods:
Re-Con Engine,De-Tango,Reverse camera,Fog/DRl lights,Aux Battery, perm Aux socket in boot,LED Volt meters in roof panel,Built in tom tom, Strobes fitted in grille, Aux switches for trailer lights fitted in roof panel,Roof Rails,Grille conversion 
 
Post #193098528th Mar 2018 9:51 am
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Navigator
 


Member Since: 17 Mar 2010
Location: Stay at Home. One of the lives you save could be your own.
Posts: 5103

Scotland 2015 Discovery 4 3.0 SDV6 SE Auto Causeway GreyDiscovery 4

It will work sometimes - and here is why.

Diesel engines are compression ignition. Squeeze the right mixture of fuel and air and it will ignite. When running, the inside of the cylinders is hot and the liquid can evaporate. Starting from cold the fuel is liquid, or rapidly becomes so again despite the spray effect of the injector. Liquids (generally) cannot be compressed, only gases. So the glow plugs' job is to heat some of the fuel to a gas to be compressible and ignite under pressure. That produces heat ready for the next charge.

All the clever electronics and sensors are doing is trying to guess when the inside is ready for the first compression. Fool the sensors, and it will crank. Nice when there IS sufficient fuel vapour to get going, but there will not always be, otherwise no need to fit costly glow plugs. Easy Start is a volatile hydrocarbon that gives enough vapour to ignite.

Warming the block up with the FBH will give conditions of vapourised fuel, as long as the FBH can overcome low initial temperature and onging losses.
 A vaccine does not stop you catching a virus, or passing it on, or getting ill from it, really ill. It does reduce the likelyhood of you dying when really, really ill. Stay Alive - KEEP AWAY FROM PEOPLE.  
Post #193099128th Mar 2018 10:22 am
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