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Duramax Third Generation: 2006-2007.5 (LBZ & LLY) Discuss the third generation (2006-2007.5 LBZ & LLY) of the 6.6L Duramax diesel engine & associated components. 2006 LLY engine discussion also belongs in this forum due to the similarities of the 2006 LBZ and the 2006 LLY. Engine related discussion ONLY.

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Old 03-04-2020, 11:26 AM   #1 (permalink)
Hauling
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No Glowplugs?

I changed my thermostats. I had a CEL and an error code(on torque app).
I removed radiator shroud, removed air resonator, unplugged A/C and moved compressor.
Afterwards, I have a CEL light with no error codes.
I clear "absent" code and start truck directly, no pause for glowplugs and it starts with no CEL light.
If I pause for glowpugs, the indicator stays on for 45 seconds. And I get a CEL.
I believe that I am running with no glowplugs.
I checked all connectors. That's as far as I have gotten. Be Sunday before I can look at it again.

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Old 03-04-2020, 10:54 PM   #2 (permalink)
roswell
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Check the wires at the glow plug module. Up against the firewall Ivo the steering shaft. When I replaced my injectors on the LB7 they got reversed. Two identical black wires, same symptoms. Not sure if it applies on an LBZ, but worth a look.

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2007 CCSB LBZ

2011 Sienna Limited.
2007 GMC YUKON XL (RIP) mpg
2006 BMW R1200GS (RIP) -kid 4
2006 BMW 330i (RIP) -kid 3
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1986 Bell AH-1W
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Old 03-06-2020, 04:41 PM   #3 (permalink)
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Works fine when it is warm.

The glowplug light comes on and turns off immediately because engine is warm. Truck starts and runs normally with no CEL or fault code.
I did start truck cold and received a p0116 fault code, for ECT temperature. Which was original code where I was advised to change thermostats.
Before that, I was getting glowplug light on for 45 seconds, A CEL but no fault code(using torque pro, an app).
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Old 03-06-2020, 04:44 PM   #4 (permalink)
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Quote:
Originally Posted by roswell View Post
Check the wires at the glow plug module. Up against the firewall Ivo the steering shaft. When I replaced my injectors on the LB7 they got reversed. Two identical black wires, same symptoms. Not sure if it applies on an LBZ, but worth a look.

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The glowplug module on my firewall has two different connectors. I disconnected some smaller connectors, ECT sensor, A/C in thermostat area when I was working there but I can't see any that I missed reconnecting. I was looking for a glowplug relay as LB7 has but LBZ doesn't seem to have one.
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Old 03-14-2020, 02:23 PM   #5 (permalink)
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Has anyone ever had multiple glowplugs out with no glowplug fault?
I am using a dmm on this now and I have more than 1 glowplug at 1 megohm or higher.
Still have 3v to glowplug when key is turned on.
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Old 03-14-2020, 03:47 PM   #6 (permalink)
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Have you read:

Glow Plug Replacement https://www.dieselplace.com/forum/sh...d.php?t=297996

Is your truck CA emissions?


Roz
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Never argue with an idiot. They'll drag you down to their level and beat you with experience.

2007 CCSB LBZ

2011 Sienna Limited.
2007 GMC YUKON XL (RIP) mpg
2006 BMW R1200GS (RIP) -kid 4
2006 BMW 330i (RIP) -kid 3
2004 CCSB LB7 (RIP)
1986 Bell AH-1W

Last edited by roswell; 03-14-2020 at 03:53 PM.
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Old 03-14-2020, 04:01 PM   #7 (permalink)
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Quote:
Originally Posted by roswell View Post
Have you read:

Glow Plug Replacement https://www.dieselplace.com/forum/sh...d.php?t=297996

Is your truck CA emissions?


Roz

Appreciate the info. I would have to check on emissions. truck is in Mass.

I will doublecheck the electrical connections though.
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Old 03-14-2020, 07:15 PM   #8 (permalink)
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Quote:
Originally Posted by Hauling View Post
Appreciate the info. I would have to check on emissions. truck is in Mass.

I will doublecheck the electrical connections though.
Yeah, I think the point is that one has a bus bar on them and one doesn't. More importantly, if you do decide to change the glow plugs at some point, the old GM software caused the tips to swell and the update fixed that. IIRC, many a swollen tip have broken off in the cylinder during removal. Bad, bad bad. Might be worth having a shop do it. All this for a thermostat change. What a PITA. Sorry man.

I've also read that a TECH II can read individual voltages, fwiw.

Also, the Roswell is a pilot, not a mechanic. So there's that.

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__________________
Never argue with an idiot. They'll drag you down to their level and beat you with experience.

2007 CCSB LBZ

2011 Sienna Limited.
2007 GMC YUKON XL (RIP) mpg
2006 BMW R1200GS (RIP) -kid 4
2006 BMW 330i (RIP) -kid 3
2004 CCSB LB7 (RIP)
1986 Bell AH-1W
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Old 03-14-2020, 10:39 PM   #9 (permalink)
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Quote:
Originally Posted by roswell View Post
Yeah, I think the point is that one has a bus bar on them and one doesn't. More importantly, if you do decide to change the glow plugs at some point, the old GM software caused the tips to swell and the update fixed that. IIRC, many a swollen tip have broken off in the cylinder during removal. Bad, bad bad. Might be worth having a shop do it. All this for a thermostat change. What a PITA. Sorry man.

I've also read that a TECH II can read individual voltages, fwiw.

Also, the Roswell is a pilot, not a mechanic. So there's that.

Sent from my Pixel 3 XL using Tapatalk



Pilot of what?
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Old 03-14-2020, 10:45 PM   #10 (permalink)
roswell
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Everything from a 737 to a Bell 204. I'm rated to fly and instruct in everything the FAA has ratings for except float planes, tail draggers, and gliders. I have aircraft systems bouncing around in my head that would make normal people... Fall sleep. Sometimes it helps with the trucks. High pressure fuel systems, bypass filtration, cooling, etc. It's all pretty much the same fundamentally. How GM bastardized it is the trick. *shrug*

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__________________
Never argue with an idiot. They'll drag you down to their level and beat you with experience.

2007 CCSB LBZ

2011 Sienna Limited.
2007 GMC YUKON XL (RIP) mpg
2006 BMW R1200GS (RIP) -kid 4
2006 BMW 330i (RIP) -kid 3
2004 CCSB LB7 (RIP)
1986 Bell AH-1W

Last edited by roswell; 03-14-2020 at 11:14 PM.
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