ok guys my next door neighbor is schoolin me on diesels.... and i never new this i feel real stupid... glow plugs only are use on start up??? once the engine starts the glow plugs turn off and combustion is made by pressure in the cylinders.... i never new that

they stay on for a few seconds after start up if its cold. but yes that correct. they arent used anything like a sparkplug

well dam i am retarded.... cause i got this dam p0380 code that will not go away, changed the controller changed all the glow plugs.. changed fuse and yet its back... but it seems to me it does not really matter that much.

ok guys my next door neighbor is schoolin me on diesels.... and i never new this i feel real stupid... glow plugs only are use on start up??? once the engine starts the glow plugs turn off and combustion is made by pressure in the cylinders.... i never new that

Yes it is true, It's called compression ignition!!!

well dam i am retarded.... cause i got this dam p0380 code that will not go away, changed the controller changed all the glow plugs.. changed fuse and yet its back... but it seems to me it does not really matter that much.

ive had that code for oh bout 6 months now. starts perfect cold or warm so i said hell with it and turned of the mil code with efi

well how does a diesel even start without glow plugs... cause form what my neighbor was tellin me.. i can take all the plugs out, plug up the holes and itll still start

If the ambient temps arent very cold, the glow plugs arent needed. The glow plugs are used to warm the cylinders prior to start up. Diesel engines use high compression to ignite the fuel. The glow plugs help only at start up. After that, the high compression ignition provides plenty of heat!

By the way, I have also had that code for awhile and I'm not worried about it. Starts fine in any weather I encounter.

well dam i am retarded.... cause i got this dam p0380 code that will not go away, changed the controller changed all the glow plugs.. changed fuse and yet its back... but it seems to me it does not really matter that much.
I also have a P0380 code, because 2 of my glow plugs burned out, then snapped off in the block. Long story; if you want to know, it has it's own (old by now) thread that you should be able to find from my profile.
well how does a diesel even start without glow plugs... cause form what my neighbor was tellin me.. i can take all the plugs out, plug up the holes and itll still start
Yes, you can start a diesel with no glow plugs. If they are really cold, it won't light for a while, the engine will just turn over, but every time it turns over, it compresses the air in the cylinders, generating heat. Pretty soon (theoretically), it starts staying hot enough that the diesel will ignite, allowing the engine to start without glow plugs.

The duramax also has an intake heater that heats the incoming air to a point that it will ignite diesel after it is compressed, so the duramax can start without any of the glow plugs working. Also of note, the Cummins engines used in Dodge trucks ONLY have an intake heater, and no glow plugs. Either way works, and GM just covered all bases.

Because the duramax has both the intake heater and glowplugs, I wouldn't worry about the code unless you have money to burn, OR the truck is getting hard to start in the cold. And it would have to be DARN cold too...

I'd use EFILive to kill the code in the computer so the light goes away. I am saving up for EFI right now to do that (and some other things :D).

In some of my old Diesel Cats, they are started with a gasoline motor, and there are no glow plugs at all. Once the gasoline (pony) motor is started, the exhaust is piped through the air intake for the diesel before exiting through it's own exhaust stack. This warms the incoming air to aid in compression ignition. Secondly, when the pony is spinning the diesel, it is creating heat in the motor by friction, and also by circulating coolant through the running pony motor and back into the diesel block. Once you engage the compression release, you are increasing the resistance, thus the heat. Once you open the fuel, in a perfect world, the diesel starts. Thank God you have glow plugs and a 24V starter.

where is the 24v coming from on a duramax? ever thing is 12v the batteries are not hooked up to make 24V unless it's military. they are not hooked up as a series=24v(ground to ground and then positive to ground on bat #2 and then positive(now 24v) to elcetrical sys)they are hooked up as parallel12v(groung to ground on both bats)

I think diesel has a compression ratio of 25/1 vs gas that is any thing from 8/1 to 10/1. my 1976 chevy 1500 4wd has a 454 with 10.5/1 and if I run it on 87 octane it will " diesel" when I shut it off and have to dump the clutch to kill it or it will try to stay running.

I think diesel has a compression ratio of 25/1 vs gas that is any thing from 8/1 to 10/1. my 1976 chevy 1500 4wd has a 454 with 10.5/1 and if I run it on 87 octane it will " diesel" when I shut it off and have to dump the clutch to kill it or it will try to stay running.

Not the duramax.LB7/LLY 17.5:1
06 LLY+ IS 16.8:1

I think diesel has a compression ratio of 25/1 vs gas that is any thing from 8/1 to 10/1. my 1976 chevy 1500 4wd has a 454 with 10.5/1 and if I run it on 87 octane it will " diesel" when I shut it off and have to dump the clutch to kill it or it will try to stay running.

But your gasser running after switch-off is due to hot-spots or carbon build-up igniting the fuel rather than compression.

Isnt that the same code that has been corrected by a intake heater? Check the search for intake heater and p0380, I am on my cel phone and cant help anymore than that.