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i'm having an issue with my kia ceed 1.6 crdi. it's 2 months old, 3000 km.
when i start the cold engine in the winter days (temperature below 0C) the RPM falls to around 500 for a few seconds, then eventually it goes back to normal (cca. 900) range. it also happened few times that the engine didn't start at the first try. few days ago i had to try about 10 times to successfully start the engine (outside temperature was -5).
i'll take my car to the service, but on the phone i was told that at least the first part (500rpm) is normal behaviour.
My Ceed does not behave like yours. I wrote down some experiencies from a cold start last winter here: http://www.kia-forums.com/kia-ceed-f...heat-up-2.html post 19.
Normally I try to preheat the engine with the electric heater before starting but even with a cold engine it always starts at the first attempt. And as in the link the rpm rises the first seconds. Mine is 2010 model manufactured atumn 2009 with 115 hp.
Our ambient temperatures have been down to -10C recently and my car has started first time every time. The revs initially go to about 1100, and rapidly drop to normal idle speed, (800ish rpm). The glow plug light is on for about 5 seconds at these temperatures.
Horror, Since the temperature has been down -4 to -8 degrees, I've had to let the glow plug cycle complete. It starts straight away then. It hunts down then up for a couple of seconds then settles at 900rpm, and then never misses a beat. Iwas taught to depress the clutch when starting. One, it takes the cold box drag out of the equasion. And if your in a hire car or unknown one with a sloppy box, it stops you looking a nerd as the vehicle lurches forward cos it was left in gear.
NO, this is not near to normal starting. You MUST warm the glow plugs in Diesels. Otherwise it may cause engine damage.
In very cold conditions you may need to cycle them more than once. 3 times is known to be a good preparation in -25C.
I would like to somewhat disagree.
There should not be needed to do more than one preheat on a modern common-rail engine, if the engine and its components are in good condition. Doing more then one cycle can damage the glow plugs and should only be used if no other option works. An old mechanic pump diesel might need multiple glow cycles.
The Kia diesel starts without any problems at -25 with one glow, which takes about 10 seconds.
If really cold, the glow plugs continues to glow for a couple of minutes after the engine has started.
PLP, What damage could I cause please. I thought that deisel engines were compression ignition, i:e compress air, which heats it, inject fuel mist which is ignited by the heat. Glow plugs will preheat an uncompressed cylinder giving a hotter compressed charge. The plug in the cylinder with the piston at the top of its stroke will do nothing because if you turn the engine over after the glow cycle, the piston will go down, inducing a cold charge which is then just mechanicaly heated. Or do the plugs remain energised after the warning light goes out on the display?
There should not be needed to do more than one preheat on a modern common-rail engine, if the engine and its components are in good condition.
Yes, assuming all components are in great condition (like new) and engine is modern in which the glow plug will keep heating according to engine temperature.
If not (lets say 2003 with 100k km/miles) one cycle many times does not suffice. But well, it all depends on many factors - fuel type, humidity, engine condition...
Originally Posted by Dowdeswell
compression ignition, i:e compress air, which heats it, inject fuel mist which is ignited by the heat
completely correct, but if you happen to not ignite the mixture, fuel and water may condense inside the cylinder (decompression/suction cycle). In such condition, next injection may contain more fuel than needed to ignite; therefore, making it harder to start. As you know, common problem in all types of engines (2/4 strokes, diesel/petrol...).
So, damage... - unburned fuel dripping to oil pan, too reach mixture to start with... several other things you can think of. There won't be any mechanical damage, though.
In general note for starting diesel (modern or 80's). It all depends on many factors (as above). You must simple observe if one cycle is enough. If not, next time try two cycles...
To make it completely clear - I do NOT tell everyone to cycle glow plugs more than once. It all depends how your engine starts... and with age you may need more than one cycle
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