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      02-10-2019, 12:15 PM   #1
fuzzybunny
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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.
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      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, 12:31 PM   #3
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I wonder if the plugs come on when I get in the car close the door and the key is detected.
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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...
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      02-10-2019, 02:33 PM   #7
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Quote:
Originally Posted by mikeoz View Post
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...
When was this.. 1950?

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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Quote:
Originally Posted by doug_328d View Post
Was just camping in -20F weather. Car started with no delay and no heat symbol. Does it have to be -50F to have the delay?
Camping during the polar vortex? Ouch.
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      02-10-2019, 03:29 PM   #9
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Quote:
Originally Posted by doug_328d View Post
Was just camping in -20F weather. Car started with no delay and no heat symbol. Does it have to be -50F to have the delay?
Who in their right minds would know? -20f is minus 29c and -50f is -45c that's not camping weather unless your surname is Shackleton or Watsey.
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      02-10-2019, 03:49 PM   #10
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      02-11-2019, 12:01 AM   #11
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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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Quote:
Originally Posted by fuzzybunny View Post
I wonder if the plugs come on when I get in the car close the door and the key is detected.
They do.
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      02-11-2019, 07:49 AM   #15
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Quote:
Originally Posted by Hooded View Post
When was this.. 1950?

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.
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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Quote:
Originally Posted by mikeoz View Post
ok may be not a whole 5 mins but sure felt like it in an old 190D Merc...
Know what you mean. Some of the old diesels were certainly 10 seconds or more to get sufficient glow plug heating.

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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      02-11-2019, 10:38 AM   #17
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The leaky EGR is keeping the engine warm
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