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mat0013
Member Since: 22 Aug 2011
Location: Mons
Posts: 3
  
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| Engine not running well after preheating |
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Good morning all,
I have a problem with my Webasto or Disco
I installed an Altox case to warm the engine in the morning before I start. But when I do it heated 30 minutes. I get in the car to start the engine and it starts direct but not running well and impossible to accelerate. After 30s to 1m it turns normally.
If I start without having put the webasto the auto start direct and normally. So the glow plug is ok
The problem comes as well at 4 ° as -2 °
I hope you will understand because I translate from French.
Discovery 3 2004
Thank you
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 18th Nov 2019 8:51 pm |
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lynalldiscovery
Member Since: 22 Dec 2009
Location: Maidstone
Posts: 7274
  
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You will most likely need to get the codes read to make sure there are no errors stored.
I have had engine pre heaters on several cars now and when used in cold weather the diesel engines always sound harsh as the ecu seems to be trying to work out whats going on as although the engine coolant is warm it is still fuelling for a cold engine, after about 30 to 60 seconds I don not notice the harshness anymore.
I suppose as the warm coolant has been pumped to all corners of the engine and the ecu is now happy?
I have even had the same effect on a petrol v8, it would start okay but be all fluffy on the throttle pedal for several hundred metres then clear.
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| 18th Nov 2019 9:26 pm |
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mat0013
Member Since: 22 Aug 2011
Location: Mons
Posts: 3
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I have no fault code. when I heated it up I see the needle is at 90 ° and it does not start well
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| 18th Nov 2019 9:34 pm |
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Hardware
Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 13033
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i'm 99% sure there is an old thread on this subject ... but I think lynalldiscovery has summed it up.
Is this the issue where some folks modify the resistance of the sensor ? .
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer  ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
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| 18th Nov 2019 9:55 pm |
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mat0013
Member Since: 22 Aug 2011
Location: Mons
Posts: 3
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If you find the talk, I'm interested! 
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| 18th Nov 2019 10:06 pm |
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Net_fisher2
Member Since: 23 May 2017
Location: Isle of Wight
Posts: 99
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I have this same issue sometimes... 
My fix is to put the keys in the ignition, turn on the ignition until fuel pump is running.
Leave until fuel pump cuts out...or for 5 or so seconds...
Then start the engine....seems to start fine every time and run normal.
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| 19th Nov 2019 1:28 pm |
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OvalAutos
Member Since: 28 Dec 2018
Location: Cradley Heath
Posts: 382
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lynalldiscovery wrote:You will most likely need to get the codes read to make sure there are no errors stored.
I have had engine pre heaters on several cars now and when used in cold weather the diesel engines always sound harsh as the ecu seems to be trying to work out whats going on as although the engine coolant is warm it is still fuelling for a cold engine, after about 30 to 60 seconds I don not notice the harshness anymore.
I suppose as the warm coolant has been pumped to all corners of the engine and the ecu is now happy?
I have even had the same effect on a petrol v8, it would start okay but be all fluffy on the throttle pedal for several hundred metres then clear.
Correct. The ECU reads the oil, coolant and ambient temp. It then decides what fuel is required for the current environment. A warm coolant and cold oil will make the engine lumpy until they balance out.
The oil and coolant temp should be within 10degs of each other. Joe
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| 19th Nov 2019 2:47 pm |
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Hardware
Member Since: 28 Jun 2016
Location: Hiding under the M60
Posts: 13033
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ok ... looks like I managed to merge (in my head at least) two different issues.
The "resistor fix" https://disco4.com/forum/disco-3-not-start...g+resistor doesn't really link with the webasto issues.
there are lots ( and I do mean LOTS ) of threads that come up if you search "lumpy running" ... if you look for ones started in colder months, you will find lots that match with OvalAutos' and lynalldiscovery's shorter explanations. .
Dean
====================================
2011 D4 XS - OBD port protection, RLD spare wheel protector, All LED interiors lights, Timed Climate enabled, iiD tool paired.
2011 D4 Landmark - Stolen from same dealer before I paid for it
2011 D4 GS - Stolen whilst at dealer ... All LED interiors lights, DRLs, Spare Wheel protector.
1996 300Tdi - Eaten by tin worms
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| 19th Nov 2019 8:22 pm |
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