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Glow plugs pre-heating when they shouldn't? |
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wasted |
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Joined: Feb 12 2012
Member No: #799
Location: Cambridge |
I've noticed that my glowplug preheat light comes on most mornings at the moment. Its seems a bit strange because winter is so mild this year. From what I've read on here it should only need pre-heat if it's properly cold. I'm guessing dodgy coolant temp sensor but nothing comes up if I read the codes via a generic ODB2 scanner. Is it worth swapping out for a new coolant sensor? I cant think of any other way that it would know the ambient temperature? Cheers. |
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Dave Mc |
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Joined: Mar 02 2010
Member No: #64
Location: Weston-super-Mare |
I've got the C5 with the same 2.7 engine and my glow plug preheat light has been coming on. Not something I would worry about, as it's been so windy it has resulted in the engine block becoming very cold. | ||
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Tjensen |
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Joined: Jul 17 2012
Member No: #954
Location: Bergen |
Glow plugs start to function a bit below 10 celcius and way before 5 celsius, I think. | ||
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gmerry |
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Joined: Dec 11 2009
Member No: #21
Location: Scotland |
Without wishing to over-complicate this, I'm guessing that the glow plug warning lamp is NOT directly related to the status of the glow plug function. In other words, the glow plugs may come on in normal cold start service without the driver being aware. The warning lamp is just there to say "wait a minute for the glow plug to heat up because the block is VERY cold". Normally there is no need to wait and so no lamp appears. If the lamp is always coming on, even for mild weather starts, this would indeed point towards a system component having failed or being faulty. Note, over 4 years of Scottish winters, I have probably only had the warning light come on maybe 5-6 times. Regards G |
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magicands |
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Joined: Sep 13 2012
Member No: #1021
Location: Coventry, Warwickshire |
My pre heater light has been coming on most mornings just lately, its not a fault but just down to weather and atmospheric conditions, I'd forget about it as its not a fault. | ||
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wasted |
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Joined: Feb 12 2012
Member No: #799
Location: Cambridge |
OK. Thanks all. I might replace the coolant temp sensor next time I service and see if it changes anything but I wont loose any sleep over it if its a common thing | ||
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ChrisHunter |
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Joined: Jul 20 2010
Member No: #188
Location: Lancashire |
as we understand it, HDi engines use the glow-plugs (suitably controlled) to help all-through engine warm-up, all year ... presumably the light is informational, because delays could be handled automatically ... ours is garaged overnight & have never noticed it ! | ||
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