02-10-2019, 12:15 PM | #1 |
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Diesel starting question
Probably the wrong place to post this but here goes.
So why does my 6 pot BMW diesel start first time even when its -5 degC outside? How does it do that, I'm used to glow plugs and having to give a least few seconds before turning the engine over. |
02-10-2019, 12:24 PM | #2 |
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They do have glow plugs. Mine pauses for a second, shows the heating element symbol before starting. Not sure what temp that is, but seen it a few times recently.
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02-10-2019, 12:32 PM | #4 |
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1. Direct injection vs the old swirl chambers of yesteryear.
2. Glow plugs that get very hot very quickly. |
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02-10-2019, 12:48 PM | #5 |
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I notice the 'pre-heating' come up on the display if I press the ignition on before starting the car in cold weather. Then when I actually start the car it starts instantly in around 1 second max.
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02-10-2019, 01:04 PM | #6 |
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I can recall the days when you got in a diesel turn the key then sit for 5 mins until the coil light went out...lol
Thank god those days are behind us... |
02-10-2019, 02:33 PM | #7 | |
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The longest I remember waiting before starting a diesel was when I borrowed a mid 90s Peugeot 306 diesel. You had to wait around 5 - 10 seconds after turning the key for the yellow light to go out before starting it. |
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02-10-2019, 02:47 PM | #8 |
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Camping during the polar vortex? Ouch.
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02-11-2019, 12:05 AM | #12 |
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Try -13. Not so instant. Last year in the Cotswolds is when I first read the preheating sign. It took about 30 seconds.
A mate still has an early 90's peugeot van I borrowed and he said it takes 2 minutes. It was slightly more but old glow plugs took an eternity to heat up. |
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02-11-2019, 12:43 AM | #13 |
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mines also paused for a second or so a few weeks back and it was only slightly below zero. Few days later the charge battery light warning came on. Not sure if its related though.
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02-11-2019, 12:52 AM | #14 |
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They do.
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02-11-2019, 07:49 AM | #15 |
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ok may be not a whole 5 mins but sure felt like it in an old 190D Merc...
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02-11-2019, 08:04 AM | #16 | |
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Some of the old BMC diesels would then take another 10 seconds (or more) of cranking, to fire up, with a big plume of blue smoke. Thank goodness we don't have CAV DPA fuel injection pumps these days. |
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