Glow plugs

gmduramax

Shits broke
Jun 12, 2008
4,087
254
83
Nor cal
By no means can you compare a dmax to those old dinosaurs. Completely different fuel injection system as well as much better computer controls and engine engineering in a dmax.

7.3s live off glow plugs when they cold start. If they don't have good plugs, they don't start for crap even in warm weather. A duramax may cough and sputter on a cold cold morning with a few glow plugs out but it will fire up

Duramax doesn't need glow plugs or a grid heater until 30* I've been 15* and it takes a bit of cranking and it isn't happy but it always starts.
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
21,809
6,031
113
Phoenix Az
Duramax doesn't need glow plugs or a grid heater until 30* I've been 15* and it takes a bit of cranking and it isn't happy but it always starts.

ive been down to 15-20 and it crank right up. no fighting to start at all, just some huffing of white smoke. thats 16.5:1 compression ratio, tight piston to head clearance, and stock LLY injectors. no idea how 100% overs would be in it now. :D
 

gmduramax

Shits broke
Jun 12, 2008
4,087
254
83
Nor cal
ive been down to 15-20 and it crank right up. no fighting to start at all, just some huffing of white smoke. thats 16.5:1 compression ratio, tight piston to head clearance, and stock LLY injectors. no idea how 100% overs would be in it now. :D

I got 250's and it does surprisingly well
 

torqued2dmax

Member
Mar 26, 2017
646
1
18
Brookville, PA
They are about $175 for 8 , when I pulled mine at 80,000 half the tips were missing , being in PA they are used more often causing them to deteriorate more often . There was no damage to wall , pistons or valves , I lucked out .
 

bmc1025

Member
Jan 25, 2013
521
0
16
Big Bone, KY
The main power wire to my gpcm is disconnected in my plow truck. I was having issues with the glow plug light staying on after the truck was running so I disconnected it. That was 3 years ago and the coldest it ever started was -10f it sounded like my 6.5 but started nonetheless.
 

dk2429

New member
May 30, 2017
123
1
0
Texas
The main power wire to my gpcm is disconnected in my plow truck. I was having issues with the glow plug light staying on after the truck was running so I disconnected it. That was 3 years ago and the coldest it ever started was -10f it sounded like my 6.5 but started nonetheless.

Ha! Out of curiosity, how do you like that 6.5?
 

bmc1025

Member
Jan 25, 2013
521
0
16
Big Bone, KY
video of said cold start. It was actually -6F
https://youtu.be/Vpc1n5VuPsA
Vpc1n5VuPsA