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C30 / S40 & V50 '04-'12 / C70 '06-'13 General Forum for the P1-platform C30 / S40 / V50 / C70 models |
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Coolant temperature sensor accuracyViews : 1006 Replies : 9Users Viewing This Thread : |
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Feb 1st, 2019, 10:21 | #1 |
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Coolant temperature sensor accuracy
Still trying to get the car to start right in winter...
(2007 V50 2.0d) How accurate should a coolant temperature sensor be? Car was left standing for 8.5 hours outside. Whole day it was temperature around negative 5°C, right before starting car instrument panel was showing -6°C, but engine coolant temperature -1°C Sice car was standing still for so long, it should be competely cold and I assume readings should be closer... As ususal it started quick but was jerking and misfiring right after starting for a couple of minutes. How much this measurement difference could impact the cold start? |
Feb 1st, 2019, 13:20 | #2 | |
WowIcanwriteAnythingHere!
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I dont think it is related to misfiring at all, to be honest. Maybe bad quality diesel, or glow plug relay? Did you have those issues when temps were more normal?
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Feb 1st, 2019, 15:35 | #3 |
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Surely no issue with coolant being -1 or indeed -10 as it does not freeze at those temperatures.
Is it misfireing or just running like **** from cold, mine idles horribly for a few mins when cold, especially with the air con on, but then most diesels do especially older ones. |
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Feb 1st, 2019, 16:24 | #4 | |
WowIcanwriteAnythingHere!
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[OT question from physics - so if there is actually -10 outside and you put a normal thermometer into bowl of liquid antifreeze left outside, it should show exactly -10 aswell? ]
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Feb 1st, 2019, 17:18 | #5 |
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Don't forget the sensor feeding the -6 figure to the dash cluster is mounted low down behind front bumper and is therefore picking up more the ground temperature,where the coolant temp sensor is mounted higher on the engine and is to some extent shielded from this and is more picking up the temperature of the coolant at the particular point on the engine where it's mounted.How much of a variation there is between the two I don't know.
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Feb 1st, 2019, 17:33 | #6 |
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Dippydog could be right...Try read the MAF temp without starting the engine and see what you get...the MAF it's also "inside" ...
I am keeping mine into garage and we have above 0 celcius temps for the moment outside ,but if you are not in a hurry ,I would check it on mine too(same car/engine but 2004 made)... Though I would rather blame the injectors...Welcome to the OLD DIESEL ENGINES REALM |
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Feb 1st, 2019, 19:59 | #7 | |
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On a stone cold engine, the coolant temperature will always match whatever the outside ambient temperature is within 1 or 2 °C.
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