Member Since: 04 Feb 2015
Location: Gloucester
Posts: 352
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
27th Mar 2018 6:18 pm
Narpy
Member Since: 18 Jul 2011
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Wow, did I really just read that? Mods:
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27th Mar 2018 6:26 pm
rrhool
Member Since: 28 Aug 2014
Location: Norfolk
Posts: 4523
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 Richard
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27th Mar 2018 6:37 pm
zinke
Member Since: 22 Feb 2014
Location: Scunthorpe
Posts: 584
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.
27th Mar 2018 6:59 pm
Flapper
Member Since: 04 Feb 2015
Location: Gloucester
Posts: 352
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!!!
28th Mar 2018 8:30 am
J@mes
Member Since: 10 Nov 2008
Location: Bomber County
Posts: 4547
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.
28th Mar 2018 8:33 am
DSL Keeper of the wheelie bin
Member Since: 11 May 2006
Location: Off again! :-)
Posts: 73086
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.
28th Mar 2018 8:40 am
robpenrose
Member Since: 12 Jan 2016
Location: Surrey / SW London
Posts: 2138
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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28th Mar 2018 8:45 am
J@mes
Member Since: 10 Nov 2008
Location: Bomber County
Posts: 4547
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.
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.
28th Mar 2018 8:50 am
Jarvis
Member Since: 16 Dec 2009
Location: West Berkshire
Posts: 280
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
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
28th Mar 2018 8:53 am
Randylover
Member Since: 31 Jan 2011
Location: Staffordshire
Posts: 1172
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
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28th Mar 2018 9:05 am
Moo D3 Decade
Member Since: 13 Aug 2010
Location: UK
Posts: 14414
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.D4 HSE EU6 (Known as Jeeves)
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28th Mar 2018 9:39 am
J@mes
Member Since: 10 Nov 2008
Location: Bomber County
Posts: 4547
Randylover wrote:
It does work,
Andy
but WHY?!
28th Mar 2018 9:49 am
Randylover
Member Since: 31 Jan 2011
Location: Staffordshire
Posts: 1172
I don’t know why, can’t answer that but it did
Andy05 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
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.
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